Abstract

Physical implementations of large-scale quantum processors based on solid-state platforms benefit from realizations of quantum bits positioned in regular arrays. Self-assembled quantum dots are well established as promising candidates for quantum optics and quantum information processing, but they are randomly positioned. Site-controlled quantum dots, on the other hand, are grown in pre-defined locations but have not yet been sufficiently developed to be used as a platform for quantum information processing. In this paper, we demonstrate all-optical ultrafast complete coherent control of a qubit formed by the single-spin/trion states of a charged site-controlled nanowire quantum dot. Our results show that site-controlled quantum dots in nanowires are promising hosts of charged-exciton qubits and that these qubits can be cleanly manipulated in the same fashion as has been demonstrated in randomly positioned quantum dot samples. Our findings suggest that many of the related excitonic qubit experiments that have been performed over the past 15 years may work well in the more scalable, site-controlled systems, making them very promising for the realization of quantum hardware.

© 2016 Optical Society of America

1. INTRODUCTION

Coherent control of quantum bits (qubits) lies at the heart of quantum computing. Among the wide variety of systems hosting qubits that can be coherently controlled, the platform of self-assembled quantum dots (QDs) is one of the most prominent due to their nanoscale size and the possibility of picosecond-timescale manipulation. Using all-optical techniques, several groups have demonstrated coherent control of excitonic qubits through experiments that involve ultrafast pulses to drive Rabi rotations [19] or demonstrate Ramsey interference [1015]. Similar experiments have been done utilizing biexcitonic states [1618] and trions [11,19,20]. The self-assembly growth mechanism however, does not allow for controllable positioning of the qubits and therefore renders such dots imperfect for use in a scalable multi-qubit system. Site-controlled QDs have recently emerged as a promising technology in addressing the issue of qubit positioning. Among the existing site-controlled QD technologies [2127], InAsP QDs embedded in deterministically positioned InP nanowires [28] stand out for their high-efficiency [29] single- [30] and entangled-photon [31,32] generation properties. This new QD system gives us an opportunity to revisit the physics of excitonic qubit coherent control in a novel, scalable platform. In this work, we demonstrate complete coherent control of individual spin-trion qubits in site-controlled InAsP nanowire QDs under a magnetic field by means of resonant multi-pulse excitation. The magnetic field in the Voigt configuration Zeeman-splits the ground and excited states creating a double lambda (Λ) system that we use as our setting for the coherent control experiments.

We perform quantum optical modeling that fully captures the observed phenomenology, giving rich insights into the underlying physics and the robustness of the system.

2. SAMPLE AND EXPERIMENTS

A. Nanowire Site-Controlled QD Sample

The sample we studied has a regular array of nanowire QDs similar to the one shown in the inset of Fig. 1(a). The nanowires are grown by vapor-liquid-solid epitaxy on an (111)B InP substrate, and deterministic positioning is achieved by masking the sample with an SiO2 mask containing a grid of apertures with a gold nanoparticle centered in each of the apertures. Once the nanowire containing the InAsP QD is grown, it is then surrounded by an InP shell grown in a second step [28].

 

Fig. 1. (a) Photoluminescence intensity of the QD emission as a function of the above-band power; the emission is split in two orthogonal linear polarizations. Emissions from both polarizations have a linear power dependence. (b) Magnetic-field dependence of the QD transition energies for the two polarizations obtained from the magneto-photoluminescence spectra (see Supplement 1 for details). (c) Polarization analysis of the photoluminescence when a B=5  T field is applied. (d) Four-level structure of the charged QD in a magnetic field. The optically excited states are the trions (3,4), whereas the ground states are the spin states (1,2). The gray downward-wavy lines denote spontaneous emission channels. The weak above-band resetting laser is depicted as the violet upward-wavy arrows. Photons are solely detected from the diagonal || transition. The driving pulses are resonant with the || transition (double-sided arrow).

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B. Charging and Level Structure

The nanowire QD we study here is initially characterized with photoluminescence measurements at cryogenic temperatures (T=8.3  K). Excitation of the sample and collection of the emitted photons is done using a 0.5-NA, long-working-distance microscope objective. Above-band excitation yields photoemission from the nanowire QD, which is observed in two linear polarizations, and spectral characterization reveals linewidths of 45±6  μeV. As shown in Fig. 1(a), the emission exhibits clear linear power dependence for both polarizations, with saturation occurring at 420  nW for 780 nm above-band excitation. Determination of the charge state of our QD (negatively charged) is here done by magneto-photoluminescence and spin-pumping measurements in the Voigt configuration (see Supplement 1 and [33]). Application of the magnetic field splits the emission into four distinct spectral lines. The peak locations of these spectral lines and their polarizations are shown in Fig. 1(b). The linear dependence of the splittings on the magnetic field and the opposite polarization between the two inner and outer transitions provides a strong experimental signature of the existence of a charged QD and its characteristic double-Λ system [34,35]. The g-factors for this QD are ge=1.49 and gh=0.22, while the diamagnetic shift factor is 7.13  μeV/T2, in good agreement with similar nanowire structures [34]. A complete polarization analysis at the maximum magnetic field (B=5  T) is shown in Fig. 1(c). The four-level structure of the system is illustrated in Fig. 1(d), with the two inner and the two outer transitions perpendicularly polarized.

In this paper, we define our quantum bit basis as the two levels | and | [or levels 2 and 3 shown in Fig. 1(d)]. We note that the spin basis used here is along the magnetic field (x-axis). The exact orientation of the nanowire with respect to the magnetic field can be found in Fig. S1 of Supplement 1. We apply a spectrally narrow resonant laser pulse on the || transition. The pulse brings the system from the electron spin ground state | to the excited trion state |, which then radiatively decays via spontaneous emission [downward gray wavy arrows in Fig. 1(d)] either to the | state or to the | state, with a 50% probability of each. If the system decays to |, then the next pulse can re-excite the system to the trion state, but if it decays to |, the pulse is no longer resonant with the transition unless the system is somehow brought back to the | state. We reset this spin ground state by exciting the system with a weak 50  nW above-band laser. The net effect of the weak above-band excitation and the spontaneous decay of the trion states to the ground states is that our system is initialized in the state | with a 50% probability. We perform a measurement of the qubit state by counting photons emitted by the diagonal transition || with a free-space single-photon-counting module; photons from other decay pathways are excluded from detection by spectral filtering using a custom-made double monochromator of 1.75 m overall length.

C. Rabi Oscillations

To demonstrate coherent control of the trion qubit, we drive the || transition with 20  ps pulses of variable amplitude that we prepare using a pulse shaper. These pulses are derived from a Ti:Sapphire picosecond pulsed laser with 80.2-MHz repetition rate. On the Bloch sphere, individual optical pulses rotate the Bloch vector about the x-axis by an angle θ proportional to the area of the pulse. In Fig. 2(a), we provide the photon counts measured from the diagonal transition || as a function of the pulse area. We observe clear Rabi oscillations that we can trace from 0 all the way to approximately 4π. The damping of the oscillations is likely due to excitation-related dephasing [36], phonon relaxation and spontaneous emission. We fit the experimentally observed oscillations using a model implemented with the Quantum Optics Toolbox in Python (QuTiP) [37], which is described in detail in the Modeling section. Using the parameters that yielded the best fit to the experimental data, we simulated the effect of the detuning of the resonant driving field to gain better insight into the robustness of the process. A detuned pulse will drive the Bloch vector about an axis rotated by ϕΔωL with respect to the x-axis of the Bloch sphere, as depicted in the inset of Fig. 2(a). In Fig. 2(b), the modeled Rabi oscillations are presented as a function of the resonant pulse detuning and driving power. The oscillations persist for detunings of up to ±20  GHz with a strong reduction in their amplitude as the laser is tuned out of resonance.

 

Fig. 2. (a) Rabi oscillations of the trion qubit. The detected counts from the || transition are proportional to the probability of the qubit being in state |. The pulses, which are resonant with the || transition, cause rotations of the qubit, which begins in the state |. The solid red line is a fit from the model. The inset depicts the Bloch sphere and its principle axes. (b) Modeled Rabi oscillations for a range of driving pulse detunings.

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D. Ramsey Interference

As we mentioned previously, an individual resonant pulse rotates the Bloch vector about the x-axis. Using a second pulse applied after a delay causes the qubit to undergo a rotation about a second axis that is at an angle ϕ=ωL·Δt with respect to the x-axis. A Mach–Zehnder interferometer with a delay stage in one arm for coarse delay tuning tc and a piezo-controlled mirror in the other arm for fine delay tuning tf splits the initial pulses into two copies with variable interpulse delay. This dual-pulse train is used for the Ramsey interference experiments. In such an experiment, the pulse areas are chosen so that each individual pulse causes a rotation by π/2  rad. The first pulse rotates the Bloch vector about the x-axis by π/2  rad, creating a coherent superposition of ground | and excited | states with equal amplitudes.

If the delay between the pulses is such that the second rotation axis is at an angle ϕ=2nπ (for n integer) with respect to the x-axis, then the second pulse will rotate the Bloch vector to the excited state |, resulting in maximal detected counts. If, on the other hand, the delay results in the second rotation axis being at an angle ϕ=(2n+1)π with respect to the x-axis, then the second pulse will bring the Bloch vector back to the ground state |, giving a minimum in detected counts. Recording the detected counts for a range of interpulse delays allows one to observe Ramsey interference fringes. Figure 3(a) shows the experimentally observed oscillations as a function of the piezo-controlled fine interpulse delay over the range Δtf(0,11)  fs. The two π/2 pulses additionally have a coarse delay of Δtc=80  ps, which eliminates any optical interference between the pulses themselves so the observed oscillations only come from the Ramsey interference. The solid line in Fig. 3(a) is a fit from the model we further use to demonstrate the effect of the pulse frequency detuning in Fig. 3(b).

 

Fig. 3. (a) Ramsey interference experiment where the qubit is driven by two π/2 pulses separated by a variable delay. Here, the coarse delay is 80 ps and the fine delay is scanned over 11 fsec, revealing oscillations that are due to quantum interference. The solid red line is a fit from the model. (b) Modeled Ramsey interference for a range of resonant pulse detunings. Detuning the pulse introduces a linear phase shift of the interference fringes and causes a reduction in their amplitude.

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As shown by the model, increasing detunings lead to a clear Ramsey interference amplitude reduction, while the phase of the fringes shows a linear dependence on the pulse detuning ΔωL. The phase shift is a consequence of the pulse detuning; the detuning causes the rotation axis to be shifted by an angle ϕ=(ω0+ΔωL)·(tc+tf) with respect to the non-detuned-pulse axis of rotation. In principle, this effect can be used to perform a Ramsey interference experiment by keeping the interpulse delay fixed and just varying the pulse detuning [14].

E. Determination of Coherence Time

The decay of the Ramsey interference amplitude for longer delays provides a measurement of the extrinsic dephasing time T2* [12]. To access information on the decay of the Ramsey interference, we record the amplitude of the oscillations for a range of coarse delays. Starting with the initial delay of Δtc=80  ps, we gradually increase the delay to 180 ps in steps of 3.34  ps. For each of the coarse delays, we repeat the Ramsey interference experiment by finely scanning the interpulse delay over the range Δtf(0,11)  fsec using the piezo-controlled delay and recording the signal amplitude.

In Fig. 4(a), we provide the measured amplitude of the Ramsey interference oscillations for all the coarse delays. The solid line is a fit from our model, and the decay time corresponds to T2*=43  ps, which is much shorter than the lifetime of the trion itself 1  ns [3032] and in good agreement with previously reported values for trions in other QD systems [20]. Using our quantum optical model, we investigated the effect of the pulse detuning and found that although it affects the overall amplitude of the oscillations, the decay time remains unchanged for the complete range of pulse detunings investigated and is mostly affected by the intrinsic and phonon-induced dephasing [36]. Figure 4(b) shows the dependence of the interference amplitude as a function of the pulse detuning, highlighting the reduction in interference amplitude for increasing detuning. Experiments performed on other nearby QDs have yielded similar decay times.

 

Fig. 4. (a) Determination of T2* using the decay of the Ramsey fringe amplitude as a function of the coarse delay. Note that the initial delay that is used in this experiment is 80 ps. The solid red line is a fit from the model with a decay time of 43 ps. (b) Modeled Ramsey fringe amplitude decay as a function of the coarse delay for a range of resonant pulse detunings. Although the amplitude gradually reduces when the detuning is increased, the decay time remains the same.

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F. Complete Coherent Control Experiment

In order to demonstrate universal single-qubit gate operation with our site-controlled nanowire QD qubit, we performed a variant of the standard Ramsey experiment.

In addition to varying the delay between the two rotation pulses, we also vary their power (i.e., area). Doing so provides access to states that are anywhere on the Bloch sphere (complete coherent control). This can be achieved because all locations on the Bloch sphere can be reached by performing two rotation operations of the Bloch vector if both the angle of rotation and the axis of the second rotation relative to the first are controlled. Figure 5(a) shows the detected counts as a function of the rotation pulse power and the interpulse delay. In this experiment, the pulses are slightly detuned from resonance by ΔωL/2π14.5  GHz. This is the origin of the slightly tilted lobe structure in Fig. 5(a), which we reproduced using our quantum optical model, as shown in Fig. 5(b). For simulated results from other pulse detunings, the reader can refer to Fig. S3 of the Supplement 1.

 

Fig. 5. (a) Detected counts when the system is manipulated with two pulses of variable power and variable delay. This allows access to the full Bloch sphere (complete coherent control). The tilt of the lobes for low pulse powers originates from the non-zero detuning of the resonant pulses used in this experiment (ΔωL/2π14.5  GHz). (b) Modeled complete coherent control, with parameters set to match those used in the experiment.

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G. Modeling

The simulations presented in our work were performed using the Quantum Toolbox in Python (QuTiP) [37].

The four-level system, driven by a pump laser with frequency

ωL=ω0ΔEtr2ΔEgs2ΔωL,
where ΔωL denotes the detuning of the laser, is described by the Hamiltonian H=Ho+HD, where
Ho=ΔEgs2s11+ΔEgs2s22+(ω0ΔEtr2)s33+(ω0+ΔEtr2)s44
represents the unperturbed QD system, where ω0 is the zero field splitting and ΔEgs and ΔEtr are the ground and trion state splittings in the presence of a magnetic field. sii are the projection operators of the self-energy terms. The driving term is
HD=(s14+s23)(Ω(t)+Ω(tΔt)eiωLΔt)+(s41+s32)(Ω(t)+Ω(tΔt)eiωLΔt),
in which the driving strength Ω is proportional to the driving electric field magnitude, and Δt=tc+tf is the total delay time between the first and the second excitation pulses. Due to the selection rules governing the system, only transitions s41, s14 and s32, s23 are driven by the laser. Since the detected signal comes from the spontaneous emission collected from the transition s31, the population level at time t1=t0+Δt+τFWHM (t0 is the time of arrival of the first pulse) is calculated by integrating the master equation
dρ˜(t)dt=i[H˜,ρ˜(t)]+jL(cj)
with L(cj) the Lindblad superoperators of the collapse operators cj. The effect of the above-band laser is modeled as the inverse of spontaneous emission. Our simulations of the final density matrix provide the photon count rates expected from each measurement (up to a normalization factor). The complete set of parameters used for the simulations that we performed here is in [38].

3. SUMMARY

In this work, we have demonstrated complete coherent control of a trion-based qubit in a site-controlled nanowire QD. We used the double-Λ structure of the charged QD in a high magnetic field as a means to spectrally separate the rotation pulses from the detection channel, and using ultrafast pulse sequences, we showed Rabi oscillations, Ramsey interference, and complete coherent control of our qubit.

The short coherence time of the trion qubit is here a limiting factor, but newer generation samples with enhanced growth conditions hold great potential for coherence time improvements [29]. Moreover, the recent development of both electrical [39] and strain tuning [40] of these nanowire QDs could help alleviate the inhomogeneous broadening, making this platform very promising for quantum hardware and opening the path for more robust qubits [41,42] to be implemented in site-controlled nanowire QDs. Nanowire-based qubits do not admit a direct mechanism for coupling neighboring (nor distant) qubits, but by adapting schemes developed for scalable trapped-ion quantum processors [43], in which distant qubits are entangled optically, one can imagine an architecture for a quantum processor based on nanowire-QD qubits. Although the replication of long-coherence-time qubit experiments in a site-controlled QD platform is a major challenge in the QD roadmap for building a quantum repeater [44], technological advancements in several promising site-controlled QD platforms [2127] make this prospect appear within our grasp.

Funding

Army Research Office (ARO) (W911NF1310309); National Science Foundation (NSF) (1503759).

Acknowledgment

We acknowledge the support of the Cabinet Office, Government of Japan, and the Japan Society for the Promotion of Science (JSPS) through the Funding Program for World-Leading Innovative R&D on Science and Technology (FIRST Program). KGL acknowledges support from the Swiss National Science Foundation. PLM was supported by a Stanford Nano- and Quantum Science and Engineering Postdoctoral Fellowship. KAF acknowledges support from the Lu Stanford Graduate Fellowship and the National Defense Science and Engineering Fellowship. KM acknowledges support from the Alexander von Humboldt Foundation. VB acknowledges support from the National Science Foundation Graduate Research Fellowship.

 

See Supplement 1 for supporting content.

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37. J. R. Johansson, P. D. Nation, and F. Nori, “QuTiP 2: A Python framework for the dynamics of open quantum systems,” Comput. Phys. Commun. 184, 1234–1240 (2013). [CrossRef]  

38. The exact simulation parameters that were used are: ΔEgs/2π=104.2  GHz, ΔEtr/2π=15.1  GHz, ω0/2π=333·103  GHz, Ω/2π(0,4.46)  GHz, ΔEtr/2π=15.1  GHz, ΔωL/2π(20,20)  GHz, γspontaneous=1  ns1, γpumping=50420·γspontaneous, γdephasing=1145·103  ns1 [αphonon=13.6·103  ns1, τFWHM=23  psec], and the time-dependent collapse operators are sjjαphonon(Ω(t)+Ω(tΔt)), j=3,4.

39. M. E. Reimer, M. P. van Kouwen, A. W. Hidma, M. H. M. van Weert, E. P. A. M. Bakkers, L. P. Kouwenhoven, and V. Zwiller, “Electric field induced removal of the biexciton binding energy in a single quantum dot,” Nano Lett. 11, 645–650 (2011). [CrossRef]  

40. Y. Chen, I. E. Zadeh, K. D. Jöns, A. Fognini, M. E. Reimer, J. Zhang, D. Dalacu, P. J. Poole, F. Ding, V. Zwiller, and O. G. Schmidt, “Controlling the exciton energy of a nanowire quantum dot by strain fields,” Appl. Phys. Lett. 108, 182103 (2016). [CrossRef]  

41. A. J. Ramsay, “A review of the coherent optical control of the exciton and spin states of semiconductor quantum dots,” Semicond. Sci. Technol. 25, 103001 (2010). [CrossRef]  

42. K. D. Greve, D. Press, P. L. McMahon, and Y. Yamamoto, “Ultrafast optical control of individual quantum dot spin qubits,” Rep. Prog. Phys. 76, 092501 (2013). [CrossRef]  

43. C. Monroe and J. Kim, “Scaling the ion trap quantum processor,” Science 339, 1164–1169 (2013). [CrossRef]  

44. P. L. McMahon and K. De Greve, in Engineering the Atom-Photon Interaction, A. Predojevic and M. W. Mitchell, eds. (Springer, 2015), Chap. 14.

References

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  1. N. H. Bonadeo, J. Erland, D. Gammon, D. Park, D. S. Katzer, and D. G. Steel, “Coherent optical control of the quantum state of a single quantum dot,” Science 282, 1473–1476 (1998).
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  4. B. Patton, U. Woggon, and W. Langbein, “Coherent control and polarization readout of individual excitonic states,” Phys. Rev. Lett. 95, 266401 (2005).
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  5. Q. Q. Wang, A. Muller, P. Bianucci, E. Rossi, Q. K. Xue, T. Takagahara, C. Piermarocchi, A. H. MacDonald, and C. K. Shih, “Decoherence processes during optical manipulation of excitonic qubits in semiconductor quantum dots,” Phys. Rev. B 72, 035306 (2005).
    [Crossref]
  6. S. Stufler, P. Machnikowski, P. Ester, M. Bichler, V. M. Axt, T. Kuhn, and A. Zrenner, “Two-photon Rabi oscillations in a single InxGa1−xAs-GaAs quantum dot,” Phys. Rev. B 73, 125304 (2006).
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  7. A. J. Ramsay, R. S. Kolodka, F. Bello, P. W. Fry, W. K. Ng, A. Tahraoui, H. Y. Liu, M. Hopkinson, D. M. Whittaker, A. M. Fox, and M. S. Skolnick, “Coherent response of a quantum dot exciton driven by a rectangular spectrum optical pulse,” Phys. Rev. B 75, 113302 (2007).
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  8. R. Melet, V. Voliotis, A. Enderlin, D. Roditchev, X. L. Wang, T. Guillet, and R. Grousson, “Resonant excitonic emission of a single quantum dot in the Rabi regime,” Phys. Rev. B 78, 073301 (2008).
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  9. H. Takagi, T. Nakaoka, K. Watanabe, N. Kumagai, and Y. Arakawa, “Coherently driven semiconductor quantum dot at a telecommunication wavelength,” Opt. Express 16, 13949–13954 (2008).
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  10. H. Htoon, T. Takagahara, D. Kulik, O. Baklenov, A. L. Holmes, and C. K. Shih, “Interplay of Rabi oscillations and quantum interference in semiconductor quantum dots,” Phys. Rev. Lett. 88, 087401 (2002).
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  11. L. Besombes, J. J. Baumberg, and J. Motohisa, “Coherent spectroscopy of optically gated charged single InGaAs quantum dots,” Phys. Rev. Lett. 90, 257402 (2003).
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  12. R. S. Kolodka, A. J. Ramsay, J. Skiba-Szymanska, P. W. Fry, H. Y. Liu, A. M. Fox, and M. S. Skolnick, “Inversion recovery of single quantum-dot exciton based qubit,” Phys. Rev. B 75, 193306 (2007).
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  15. K. Müller, T. Kaldewey, R. Ripszam, J. S. Wildmann, A. Bechtold, M. Bichler, G. Koblmüller, G. Abstreiter, and J. J. Finley, “All optical quantum control of a spin-quantum state and ultrafast transduction into an electric current,” Sci. Rep. 3, 1906 (2013).
  16. Y. Kodriano, I. Schwartz, E. Poem, Y. Benny, R. Presman, T. A. Truong, P. M. Petroff, and D. Gershoni, “Complete control of a matter qubit using a single picosecond laser pulse,” Phys. Rev. B 85, 241304 (2012).
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  20. M. V. Gurudev Dutt, J. Cheng, Y. Wu, X. Xu, D. G. Steel, A. S. Bracker, D. Gammon, S. E. Economou, R.-B. Liu, and L. J. Sham, “Ultrafast optical control of electron spin coherence in charged GaAs quantum dots,” Phys. Rev. B 74, 125306 (2006).
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  22. K. D. Jöns, P. Atkinson, M. Müller, M. Heldmaier, S. M. Ulrich, O. G. Schmidt, and P. Michler, “Triggered indistinguishable single photons with narrow line widths from site-controlled quantum dots,” Nano Lett. 13, 126–130 (2013).
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  23. C. Schneider, T. Heindel, A. Huggenberger, T. A. Niederstrasser, S. Reitzenstein, A. Forchel, S. Höfling, and M. Kamp, “Microcavity enhanced single photon emission from an electrically driven site-controlled quantum dot,” Appl. Phys. Lett. 100, 091108 (2012).
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  24. J. Tommila, V. V. Belykh, T. V. Hakkarainen, E. Heinonen, N. N. Sibeldin, A. Schramm, and M. Guina, “Cavity-enhanced single photon emission from site-controlled In(Ga)As quantum dots fabricated using nanoimprint lithography,” Appl. Phys. Lett. 104, 213104 (2014).
    [Crossref]
  25. M. K. Yakes, L. Yang, A. S. Bracker, T. M. Sweeney, P. G. Brereton, M. Kim, C. S. Kim, P. M. Vora, D. Park, S. G. Carter, and D. Gammon, “Leveraging crystal anisotropy for deterministic growth of InAs quantum dots with narrow optical linewidths,” Nano Lett. 13, 4870–4875 (2013).
    [Crossref]
  26. M. J. Holmes, K. Choi, S. Kako, M. Arita, and Y. Arakawa, “Room-temperature triggered single photon emission from a III-nitride site-controlled nanowire quantum dot,” Nano Lett. 14, 982–986 (2014).
    [Crossref]
  27. G. Juska, V. Dimastrodonato, L. O. Mereni, A. Gocalinska, and E. Pelucchi, “Towards quantum-dot arrays of entangled photon emitters,” Nat. Photonics 7, 527–531 (2013).
    [Crossref]
  28. D. Dalacu, K. Mnaymneh, J. Lapointe, X. Wu, P. J. Poole, G. Bulgarini, V. Zwiller, and M. E. Reimer, “Ultraclean emission from InAsP quantum dots in defect-free wurtzite inp nanowires,” Nano Lett. 12, 5919–5923 (2012).
    [Crossref]
  29. M. E. Reimer, G. Bulgarini, A. Fognini, R. W. Heeres, B. J. Witek, M. A. M. Versteegh, A. Rubino, T. Braun, M. Kamp, S. Höfling, D. Dalacu, J. Lapointe, P. J. Poole, and V. Zwiller, “Overcoming power broadening of the quantum dot emission in a pure wurtzite nanowire,” Phys. Rev. B 93, 195316 (2016).
    [Crossref]
  30. M. E. Reimer, G. Bulgarini, N. Akopian, M. Hocevar, M. B. Bavinck, M. A. Verheijen, E. P. A. M. Bakkers, L. P. Kouwenhoven, and V. Zwiller, “Bright single-photon sources in bottom-up tailored nanowires,” Nat. Commun. 3, 737 (2012).
    [Crossref]
  31. T. Huber, A. Predojević, M. Khoshnegar, D. Dalacu, P. J. Poole, H. Majedi, and G. Weihs, “Polarization entangled photons from quantum dots embedded in nanowires,” Nano Lett. 14, 7107–7114 (2014).
    [Crossref]
  32. M. A. M. Versteegh, M. E. Reimer, K. D. Jöns, D. Dalacu, P. J. Poole, A. Gulinatti, A. Giudice, and V. Zwiller, “Observation of strongly entangled photon pairs from a nanowire quantum dot,” Nat. Commun. 5, 5298 (2014).
    [Crossref]
  33. K. G. Lagoudakis, P. L. McMahon, K. A. Fischer, S. Puri, K. Müller, D. Dalacu, P. J. Poole, M. E. Reimer, V. Zwiller, Y. Yamamoto, and J. Vuckovic, “Initialization of a spin qubit in a site-controlled nanowire quantum dot,” New J. Phys. 18, 053024 (2016).
    [Crossref]
  34. B. J. Witek, R. W. Heeres, U. Perinetti, E. P. A. M. Bakkers, L. P. Kouwenhoven, and V. Zwiller, “Measurement of the g-factor tensor in a quantum dot and disentanglement of exciton spins,” Phys. Rev. B 84, 195305 (2011).
    [Crossref]
  35. M. Bayer, G. Ortner, O. Stern, A. Kuther, A. A. Gorbunov, A. Forchel, P. Hawrylak, S. Fafard, K. Hinzer, T. L. Reinecke, S. N. Walck, J. P. Reithmaier, F. Klopf, and F. Schafer, “Fine structure of neutral and charged excitons in self-assembled In(Ga)As/(Al)GaAs quantum dots,” Phys. Rev. B 65, 195315 (2002).
    [Crossref]
  36. A. J. Ramsay, T. M. Godden, S. J. Boyle, E. M. Gauger, A. Nazir, B. W. Lovett, A. M. Fox, and M. S. Skolnick, “Phonon-induced Rabi-frequency renormalization of optically driven single InGaAs/GaAs quantum dots,” Phys. Rev. Lett. 105, 177402 (2010).
    [Crossref]
  37. J. R. Johansson, P. D. Nation, and F. Nori, “QuTiP 2: A Python framework for the dynamics of open quantum systems,” Comput. Phys. Commun. 184, 1234–1240 (2013).
    [Crossref]
  38. The exact simulation parameters that were used are: ΔEgs/2π=104.2  GHz, ΔEtr/2π=15.1  GHz, ω0/2π=333·103  GHz, Ω/2π ∈(0,4.46)  GHz, ΔEtr/2π=15.1  GHz, ΔωL/2π∈(−20,20)  GHz, γspontaneous=1  ns−1, γpumping=50420·γspontaneous, γdephasing=1145·10−3  ns−1 [αphonon=13.6·10−3  ns−1, τFWHM=23  psec], and the time-dependent collapse operators are sjjαphonon(Ω(t)+Ω(t−Δt)), j=3,4.
  39. M. E. Reimer, M. P. van Kouwen, A. W. Hidma, M. H. M. van Weert, E. P. A. M. Bakkers, L. P. Kouwenhoven, and V. Zwiller, “Electric field induced removal of the biexciton binding energy in a single quantum dot,” Nano Lett. 11, 645–650 (2011).
    [Crossref]
  40. Y. Chen, I. E. Zadeh, K. D. Jöns, A. Fognini, M. E. Reimer, J. Zhang, D. Dalacu, P. J. Poole, F. Ding, V. Zwiller, and O. G. Schmidt, “Controlling the exciton energy of a nanowire quantum dot by strain fields,” Appl. Phys. Lett. 108, 182103 (2016).
    [Crossref]
  41. A. J. Ramsay, “A review of the coherent optical control of the exciton and spin states of semiconductor quantum dots,” Semicond. Sci. Technol. 25, 103001 (2010).
    [Crossref]
  42. K. D. Greve, D. Press, P. L. McMahon, and Y. Yamamoto, “Ultrafast optical control of individual quantum dot spin qubits,” Rep. Prog. Phys. 76, 092501 (2013).
    [Crossref]
  43. C. Monroe and J. Kim, “Scaling the ion trap quantum processor,” Science 339, 1164–1169 (2013).
    [Crossref]
  44. P. L. McMahon and K. De Greve, in Engineering the Atom-Photon Interaction, A. Predojevic and M. W. Mitchell, eds. (Springer, 2015), Chap. 14.

2016 (3)

M. E. Reimer, G. Bulgarini, A. Fognini, R. W. Heeres, B. J. Witek, M. A. M. Versteegh, A. Rubino, T. Braun, M. Kamp, S. Höfling, D. Dalacu, J. Lapointe, P. J. Poole, and V. Zwiller, “Overcoming power broadening of the quantum dot emission in a pure wurtzite nanowire,” Phys. Rev. B 93, 195316 (2016).
[Crossref]

K. G. Lagoudakis, P. L. McMahon, K. A. Fischer, S. Puri, K. Müller, D. Dalacu, P. J. Poole, M. E. Reimer, V. Zwiller, Y. Yamamoto, and J. Vuckovic, “Initialization of a spin qubit in a site-controlled nanowire quantum dot,” New J. Phys. 18, 053024 (2016).
[Crossref]

Y. Chen, I. E. Zadeh, K. D. Jöns, A. Fognini, M. E. Reimer, J. Zhang, D. Dalacu, P. J. Poole, F. Ding, V. Zwiller, and O. G. Schmidt, “Controlling the exciton energy of a nanowire quantum dot by strain fields,” Appl. Phys. Lett. 108, 182103 (2016).
[Crossref]

2014 (5)

T. Huber, A. Predojević, M. Khoshnegar, D. Dalacu, P. J. Poole, H. Majedi, and G. Weihs, “Polarization entangled photons from quantum dots embedded in nanowires,” Nano Lett. 14, 7107–7114 (2014).
[Crossref]

M. A. M. Versteegh, M. E. Reimer, K. D. Jöns, D. Dalacu, P. J. Poole, A. Gulinatti, A. Giudice, and V. Zwiller, “Observation of strongly entangled photon pairs from a nanowire quantum dot,” Nat. Commun. 5, 5298 (2014).
[Crossref]

A. Jamil, J. Skiba-Szymanska, S. Kalliakos, A. Schwagmann, M. B. Ward, Y. Brody, D. J. P. Ellis, I. Farrer, J. P. Griffiths, G. A. C. Jones, D. A. Ritchie, and A. J. Shields, “On-chip generation and guiding of quantum light from a site-controlled quantum dot,” Appl. Phys. Lett. 104, 101108 (2014).
[Crossref]

J. Tommila, V. V. Belykh, T. V. Hakkarainen, E. Heinonen, N. N. Sibeldin, A. Schramm, and M. Guina, “Cavity-enhanced single photon emission from site-controlled In(Ga)As quantum dots fabricated using nanoimprint lithography,” Appl. Phys. Lett. 104, 213104 (2014).
[Crossref]

M. J. Holmes, K. Choi, S. Kako, M. Arita, and Y. Arakawa, “Room-temperature triggered single photon emission from a III-nitride site-controlled nanowire quantum dot,” Nano Lett. 14, 982–986 (2014).
[Crossref]

2013 (7)

G. Juska, V. Dimastrodonato, L. O. Mereni, A. Gocalinska, and E. Pelucchi, “Towards quantum-dot arrays of entangled photon emitters,” Nat. Photonics 7, 527–531 (2013).
[Crossref]

M. K. Yakes, L. Yang, A. S. Bracker, T. M. Sweeney, P. G. Brereton, M. Kim, C. S. Kim, P. M. Vora, D. Park, S. G. Carter, and D. Gammon, “Leveraging crystal anisotropy for deterministic growth of InAs quantum dots with narrow optical linewidths,” Nano Lett. 13, 4870–4875 (2013).
[Crossref]

K. D. Jöns, P. Atkinson, M. Müller, M. Heldmaier, S. M. Ulrich, O. G. Schmidt, and P. Michler, “Triggered indistinguishable single photons with narrow line widths from site-controlled quantum dots,” Nano Lett. 13, 126–130 (2013).
[Crossref]

K. Müller, T. Kaldewey, R. Ripszam, J. S. Wildmann, A. Bechtold, M. Bichler, G. Koblmüller, G. Abstreiter, and J. J. Finley, “All optical quantum control of a spin-quantum state and ultrafast transduction into an electric current,” Sci. Rep. 3, 1906 (2013).

J. R. Johansson, P. D. Nation, and F. Nori, “QuTiP 2: A Python framework for the dynamics of open quantum systems,” Comput. Phys. Commun. 184, 1234–1240 (2013).
[Crossref]

K. D. Greve, D. Press, P. L. McMahon, and Y. Yamamoto, “Ultrafast optical control of individual quantum dot spin qubits,” Rep. Prog. Phys. 76, 092501 (2013).
[Crossref]

C. Monroe and J. Kim, “Scaling the ion trap quantum processor,” Science 339, 1164–1169 (2013).
[Crossref]

2012 (5)

Y. Kodriano, I. Schwartz, E. Poem, Y. Benny, R. Presman, T. A. Truong, P. M. Petroff, and D. Gershoni, “Complete control of a matter qubit using a single picosecond laser pulse,” Phys. Rev. B 85, 241304 (2012).
[Crossref]

C. Schneider, T. Heindel, A. Huggenberger, T. A. Niederstrasser, S. Reitzenstein, A. Forchel, S. Höfling, and M. Kamp, “Microcavity enhanced single photon emission from an electrically driven site-controlled quantum dot,” Appl. Phys. Lett. 100, 091108 (2012).
[Crossref]

J. S. Pelc, L. Yu, K. De Greve, P. L. McMahon, C. M. Natarajan, V. Esfandyarpour, S. Maier, C. Schneider, M. Kamp, S. Höfling, R. H. Hadfield, A. Forchel, Y. Yamamoto, and M. M. Fejer, “Downconversion quantum interface for a single quantum dot spin and 1550-nm single-photon channel,” Opt. Express 20, 27510–27519 (2012).
[Crossref]

D. Dalacu, K. Mnaymneh, J. Lapointe, X. Wu, P. J. Poole, G. Bulgarini, V. Zwiller, and M. E. Reimer, “Ultraclean emission from InAsP quantum dots in defect-free wurtzite inp nanowires,” Nano Lett. 12, 5919–5923 (2012).
[Crossref]

M. E. Reimer, G. Bulgarini, N. Akopian, M. Hocevar, M. B. Bavinck, M. A. Verheijen, E. P. A. M. Bakkers, L. P. Kouwenhoven, and V. Zwiller, “Bright single-photon sources in bottom-up tailored nanowires,” Nat. Commun. 3, 737 (2012).
[Crossref]

2011 (4)

B. J. Witek, R. W. Heeres, U. Perinetti, E. P. A. M. Bakkers, L. P. Kouwenhoven, and V. Zwiller, “Measurement of the g-factor tensor in a quantum dot and disentanglement of exciton spins,” Phys. Rev. B 84, 195305 (2011).
[Crossref]

E. Poem, O. Kenneth, Y. Kodriano, Y. Benny, S. Khatsevich, J. E. Avron, and D. Gershoni, “Optically induced rotation of an exciton spin in a semiconductor quantum dot,” Phys. Rev. Lett. 107, 087401 (2011).
[Crossref]

Y. Benny, S. Khatsevich, Y. Kodriano, E. Poem, R. Presman, D. Galushko, P. M. Petroff, and D. Gershoni, “Coherent optical writing and reading of the exciton spin state in single quantum dots,” Phys. Rev. Lett. 106, 040504 (2011).
[Crossref]

M. E. Reimer, M. P. van Kouwen, A. W. Hidma, M. H. M. van Weert, E. P. A. M. Bakkers, L. P. Kouwenhoven, and V. Zwiller, “Electric field induced removal of the biexciton binding energy in a single quantum dot,” Nano Lett. 11, 645–650 (2011).
[Crossref]

2010 (2)

A. J. Ramsay, “A review of the coherent optical control of the exciton and spin states of semiconductor quantum dots,” Semicond. Sci. Technol. 25, 103001 (2010).
[Crossref]

A. J. Ramsay, T. M. Godden, S. J. Boyle, E. M. Gauger, A. Nazir, B. W. Lovett, A. M. Fox, and M. S. Skolnick, “Phonon-induced Rabi-frequency renormalization of optically driven single InGaAs/GaAs quantum dots,” Phys. Rev. Lett. 105, 177402 (2010).
[Crossref]

2008 (2)

R. Melet, V. Voliotis, A. Enderlin, D. Roditchev, X. L. Wang, T. Guillet, and R. Grousson, “Resonant excitonic emission of a single quantum dot in the Rabi regime,” Phys. Rev. B 78, 073301 (2008).
[Crossref]

H. Takagi, T. Nakaoka, K. Watanabe, N. Kumagai, and Y. Arakawa, “Coherently driven semiconductor quantum dot at a telecommunication wavelength,” Opt. Express 16, 13949–13954 (2008).
[Crossref]

2007 (2)

A. J. Ramsay, R. S. Kolodka, F. Bello, P. W. Fry, W. K. Ng, A. Tahraoui, H. Y. Liu, M. Hopkinson, D. M. Whittaker, A. M. Fox, and M. S. Skolnick, “Coherent response of a quantum dot exciton driven by a rectangular spectrum optical pulse,” Phys. Rev. B 75, 113302 (2007).
[Crossref]

R. S. Kolodka, A. J. Ramsay, J. Skiba-Szymanska, P. W. Fry, H. Y. Liu, A. M. Fox, and M. S. Skolnick, “Inversion recovery of single quantum-dot exciton based qubit,” Phys. Rev. B 75, 193306 (2007).
[Crossref]

2006 (3)

S. Stufler, P. Machnikowski, P. Ester, M. Bichler, V. M. Axt, T. Kuhn, and A. Zrenner, “Two-photon Rabi oscillations in a single InxGa1−xAs-GaAs quantum dot,” Phys. Rev. B 73, 125304 (2006).
[Crossref]

S. Stufler, P. Ester, A. Zrenner, and M. Bichler, “Ramsey fringes in an electric-field-tunable quantum dot system,” Phys. Rev. Lett. 96, 037402 (2006).
[Crossref]

M. V. Gurudev Dutt, J. Cheng, Y. Wu, X. Xu, D. G. Steel, A. S. Bracker, D. Gammon, S. E. Economou, R.-B. Liu, and L. J. Sham, “Ultrafast optical control of electron spin coherence in charged GaAs quantum dots,” Phys. Rev. B 74, 125306 (2006).
[Crossref]

2005 (3)

B. Patton, U. Woggon, and W. Langbein, “Coherent control and polarization readout of individual excitonic states,” Phys. Rev. Lett. 95, 266401 (2005).
[Crossref]

Q. Q. Wang, A. Muller, P. Bianucci, E. Rossi, Q. K. Xue, T. Takagahara, C. Piermarocchi, A. H. MacDonald, and C. K. Shih, “Decoherence processes during optical manipulation of excitonic qubits in semiconductor quantum dots,” Phys. Rev. B 72, 035306 (2005).
[Crossref]

S. Stufler, P. Ester, A. Zrenner, and M. Bichler, “Quantum optical properties of a single InxGa1−xAs-GaAs quantum dot two-level system,” Phys. Rev. B 72, 121301 (2005).
[Crossref]

2003 (1)

L. Besombes, J. J. Baumberg, and J. Motohisa, “Coherent spectroscopy of optically gated charged single InGaAs quantum dots,” Phys. Rev. Lett. 90, 257402 (2003).
[Crossref]

2002 (3)

A. Zrenner, E. Beham, S. Stufler, F. Findeis, M. Bichler, and G. Abstreiter, “Coherent properties of a two-level system based on a quantum-dot photodiode,” Nature 418, 612–614 (2002).
[Crossref]

H. Htoon, T. Takagahara, D. Kulik, O. Baklenov, A. L. Holmes, and C. K. Shih, “Interplay of Rabi oscillations and quantum interference in semiconductor quantum dots,” Phys. Rev. Lett. 88, 087401 (2002).
[Crossref]

M. Bayer, G. Ortner, O. Stern, A. Kuther, A. A. Gorbunov, A. Forchel, P. Hawrylak, S. Fafard, K. Hinzer, T. L. Reinecke, S. N. Walck, J. P. Reithmaier, F. Klopf, and F. Schafer, “Fine structure of neutral and charged excitons in self-assembled In(Ga)As/(Al)GaAs quantum dots,” Phys. Rev. B 65, 195315 (2002).
[Crossref]

2001 (1)

T. H. Stievater, X. Li, D. G. Steel, D. Gammon, D. S. Katzer, D. Park, C. Piermarocchi, and L. J. Sham, “Rabi oscillations of excitons in single quantum dots,” Phys. Rev. Lett. 87, 133603 (2001).
[Crossref]

1998 (1)

N. H. Bonadeo, J. Erland, D. Gammon, D. Park, D. S. Katzer, and D. G. Steel, “Coherent optical control of the quantum state of a single quantum dot,” Science 282, 1473–1476 (1998).
[Crossref]

Abstreiter, G.

K. Müller, T. Kaldewey, R. Ripszam, J. S. Wildmann, A. Bechtold, M. Bichler, G. Koblmüller, G. Abstreiter, and J. J. Finley, “All optical quantum control of a spin-quantum state and ultrafast transduction into an electric current,” Sci. Rep. 3, 1906 (2013).

A. Zrenner, E. Beham, S. Stufler, F. Findeis, M. Bichler, and G. Abstreiter, “Coherent properties of a two-level system based on a quantum-dot photodiode,” Nature 418, 612–614 (2002).
[Crossref]

Akopian, N.

M. E. Reimer, G. Bulgarini, N. Akopian, M. Hocevar, M. B. Bavinck, M. A. Verheijen, E. P. A. M. Bakkers, L. P. Kouwenhoven, and V. Zwiller, “Bright single-photon sources in bottom-up tailored nanowires,” Nat. Commun. 3, 737 (2012).
[Crossref]

Arakawa, Y.

M. J. Holmes, K. Choi, S. Kako, M. Arita, and Y. Arakawa, “Room-temperature triggered single photon emission from a III-nitride site-controlled nanowire quantum dot,” Nano Lett. 14, 982–986 (2014).
[Crossref]

H. Takagi, T. Nakaoka, K. Watanabe, N. Kumagai, and Y. Arakawa, “Coherently driven semiconductor quantum dot at a telecommunication wavelength,” Opt. Express 16, 13949–13954 (2008).
[Crossref]

Arita, M.

M. J. Holmes, K. Choi, S. Kako, M. Arita, and Y. Arakawa, “Room-temperature triggered single photon emission from a III-nitride site-controlled nanowire quantum dot,” Nano Lett. 14, 982–986 (2014).
[Crossref]

Atkinson, P.

K. D. Jöns, P. Atkinson, M. Müller, M. Heldmaier, S. M. Ulrich, O. G. Schmidt, and P. Michler, “Triggered indistinguishable single photons with narrow line widths from site-controlled quantum dots,” Nano Lett. 13, 126–130 (2013).
[Crossref]

Avron, J. E.

E. Poem, O. Kenneth, Y. Kodriano, Y. Benny, S. Khatsevich, J. E. Avron, and D. Gershoni, “Optically induced rotation of an exciton spin in a semiconductor quantum dot,” Phys. Rev. Lett. 107, 087401 (2011).
[Crossref]

Axt, V. M.

S. Stufler, P. Machnikowski, P. Ester, M. Bichler, V. M. Axt, T. Kuhn, and A. Zrenner, “Two-photon Rabi oscillations in a single InxGa1−xAs-GaAs quantum dot,” Phys. Rev. B 73, 125304 (2006).
[Crossref]

Bakkers, E. P. A. M.

M. E. Reimer, G. Bulgarini, N. Akopian, M. Hocevar, M. B. Bavinck, M. A. Verheijen, E. P. A. M. Bakkers, L. P. Kouwenhoven, and V. Zwiller, “Bright single-photon sources in bottom-up tailored nanowires,” Nat. Commun. 3, 737 (2012).
[Crossref]

B. J. Witek, R. W. Heeres, U. Perinetti, E. P. A. M. Bakkers, L. P. Kouwenhoven, and V. Zwiller, “Measurement of the g-factor tensor in a quantum dot and disentanglement of exciton spins,” Phys. Rev. B 84, 195305 (2011).
[Crossref]

M. E. Reimer, M. P. van Kouwen, A. W. Hidma, M. H. M. van Weert, E. P. A. M. Bakkers, L. P. Kouwenhoven, and V. Zwiller, “Electric field induced removal of the biexciton binding energy in a single quantum dot,” Nano Lett. 11, 645–650 (2011).
[Crossref]

Baklenov, O.

H. Htoon, T. Takagahara, D. Kulik, O. Baklenov, A. L. Holmes, and C. K. Shih, “Interplay of Rabi oscillations and quantum interference in semiconductor quantum dots,” Phys. Rev. Lett. 88, 087401 (2002).
[Crossref]

Baumberg, J. J.

L. Besombes, J. J. Baumberg, and J. Motohisa, “Coherent spectroscopy of optically gated charged single InGaAs quantum dots,” Phys. Rev. Lett. 90, 257402 (2003).
[Crossref]

Bavinck, M. B.

M. E. Reimer, G. Bulgarini, N. Akopian, M. Hocevar, M. B. Bavinck, M. A. Verheijen, E. P. A. M. Bakkers, L. P. Kouwenhoven, and V. Zwiller, “Bright single-photon sources in bottom-up tailored nanowires,” Nat. Commun. 3, 737 (2012).
[Crossref]

Bayer, M.

M. Bayer, G. Ortner, O. Stern, A. Kuther, A. A. Gorbunov, A. Forchel, P. Hawrylak, S. Fafard, K. Hinzer, T. L. Reinecke, S. N. Walck, J. P. Reithmaier, F. Klopf, and F. Schafer, “Fine structure of neutral and charged excitons in self-assembled In(Ga)As/(Al)GaAs quantum dots,” Phys. Rev. B 65, 195315 (2002).
[Crossref]

Bechtold, A.

K. Müller, T. Kaldewey, R. Ripszam, J. S. Wildmann, A. Bechtold, M. Bichler, G. Koblmüller, G. Abstreiter, and J. J. Finley, “All optical quantum control of a spin-quantum state and ultrafast transduction into an electric current,” Sci. Rep. 3, 1906 (2013).

Beham, E.

A. Zrenner, E. Beham, S. Stufler, F. Findeis, M. Bichler, and G. Abstreiter, “Coherent properties of a two-level system based on a quantum-dot photodiode,” Nature 418, 612–614 (2002).
[Crossref]

Bello, F.

A. J. Ramsay, R. S. Kolodka, F. Bello, P. W. Fry, W. K. Ng, A. Tahraoui, H. Y. Liu, M. Hopkinson, D. M. Whittaker, A. M. Fox, and M. S. Skolnick, “Coherent response of a quantum dot exciton driven by a rectangular spectrum optical pulse,” Phys. Rev. B 75, 113302 (2007).
[Crossref]

Belykh, V. V.

J. Tommila, V. V. Belykh, T. V. Hakkarainen, E. Heinonen, N. N. Sibeldin, A. Schramm, and M. Guina, “Cavity-enhanced single photon emission from site-controlled In(Ga)As quantum dots fabricated using nanoimprint lithography,” Appl. Phys. Lett. 104, 213104 (2014).
[Crossref]

Benny, Y.

Y. Kodriano, I. Schwartz, E. Poem, Y. Benny, R. Presman, T. A. Truong, P. M. Petroff, and D. Gershoni, “Complete control of a matter qubit using a single picosecond laser pulse,” Phys. Rev. B 85, 241304 (2012).
[Crossref]

E. Poem, O. Kenneth, Y. Kodriano, Y. Benny, S. Khatsevich, J. E. Avron, and D. Gershoni, “Optically induced rotation of an exciton spin in a semiconductor quantum dot,” Phys. Rev. Lett. 107, 087401 (2011).
[Crossref]

Y. Benny, S. Khatsevich, Y. Kodriano, E. Poem, R. Presman, D. Galushko, P. M. Petroff, and D. Gershoni, “Coherent optical writing and reading of the exciton spin state in single quantum dots,” Phys. Rev. Lett. 106, 040504 (2011).
[Crossref]

Besombes, L.

L. Besombes, J. J. Baumberg, and J. Motohisa, “Coherent spectroscopy of optically gated charged single InGaAs quantum dots,” Phys. Rev. Lett. 90, 257402 (2003).
[Crossref]

Bianucci, P.

Q. Q. Wang, A. Muller, P. Bianucci, E. Rossi, Q. K. Xue, T. Takagahara, C. Piermarocchi, A. H. MacDonald, and C. K. Shih, “Decoherence processes during optical manipulation of excitonic qubits in semiconductor quantum dots,” Phys. Rev. B 72, 035306 (2005).
[Crossref]

Bichler, M.

K. Müller, T. Kaldewey, R. Ripszam, J. S. Wildmann, A. Bechtold, M. Bichler, G. Koblmüller, G. Abstreiter, and J. J. Finley, “All optical quantum control of a spin-quantum state and ultrafast transduction into an electric current,” Sci. Rep. 3, 1906 (2013).

S. Stufler, P. Ester, A. Zrenner, and M. Bichler, “Ramsey fringes in an electric-field-tunable quantum dot system,” Phys. Rev. Lett. 96, 037402 (2006).
[Crossref]

S. Stufler, P. Machnikowski, P. Ester, M. Bichler, V. M. Axt, T. Kuhn, and A. Zrenner, “Two-photon Rabi oscillations in a single InxGa1−xAs-GaAs quantum dot,” Phys. Rev. B 73, 125304 (2006).
[Crossref]

S. Stufler, P. Ester, A. Zrenner, and M. Bichler, “Quantum optical properties of a single InxGa1−xAs-GaAs quantum dot two-level system,” Phys. Rev. B 72, 121301 (2005).
[Crossref]

A. Zrenner, E. Beham, S. Stufler, F. Findeis, M. Bichler, and G. Abstreiter, “Coherent properties of a two-level system based on a quantum-dot photodiode,” Nature 418, 612–614 (2002).
[Crossref]

Bonadeo, N. H.

N. H. Bonadeo, J. Erland, D. Gammon, D. Park, D. S. Katzer, and D. G. Steel, “Coherent optical control of the quantum state of a single quantum dot,” Science 282, 1473–1476 (1998).
[Crossref]

Boyle, S. J.

A. J. Ramsay, T. M. Godden, S. J. Boyle, E. M. Gauger, A. Nazir, B. W. Lovett, A. M. Fox, and M. S. Skolnick, “Phonon-induced Rabi-frequency renormalization of optically driven single InGaAs/GaAs quantum dots,” Phys. Rev. Lett. 105, 177402 (2010).
[Crossref]

Bracker, A. S.

M. K. Yakes, L. Yang, A. S. Bracker, T. M. Sweeney, P. G. Brereton, M. Kim, C. S. Kim, P. M. Vora, D. Park, S. G. Carter, and D. Gammon, “Leveraging crystal anisotropy for deterministic growth of InAs quantum dots with narrow optical linewidths,” Nano Lett. 13, 4870–4875 (2013).
[Crossref]

M. V. Gurudev Dutt, J. Cheng, Y. Wu, X. Xu, D. G. Steel, A. S. Bracker, D. Gammon, S. E. Economou, R.-B. Liu, and L. J. Sham, “Ultrafast optical control of electron spin coherence in charged GaAs quantum dots,” Phys. Rev. B 74, 125306 (2006).
[Crossref]

Braun, T.

M. E. Reimer, G. Bulgarini, A. Fognini, R. W. Heeres, B. J. Witek, M. A. M. Versteegh, A. Rubino, T. Braun, M. Kamp, S. Höfling, D. Dalacu, J. Lapointe, P. J. Poole, and V. Zwiller, “Overcoming power broadening of the quantum dot emission in a pure wurtzite nanowire,” Phys. Rev. B 93, 195316 (2016).
[Crossref]

Brereton, P. G.

M. K. Yakes, L. Yang, A. S. Bracker, T. M. Sweeney, P. G. Brereton, M. Kim, C. S. Kim, P. M. Vora, D. Park, S. G. Carter, and D. Gammon, “Leveraging crystal anisotropy for deterministic growth of InAs quantum dots with narrow optical linewidths,” Nano Lett. 13, 4870–4875 (2013).
[Crossref]

Brody, Y.

A. Jamil, J. Skiba-Szymanska, S. Kalliakos, A. Schwagmann, M. B. Ward, Y. Brody, D. J. P. Ellis, I. Farrer, J. P. Griffiths, G. A. C. Jones, D. A. Ritchie, and A. J. Shields, “On-chip generation and guiding of quantum light from a site-controlled quantum dot,” Appl. Phys. Lett. 104, 101108 (2014).
[Crossref]

Bulgarini, G.

M. E. Reimer, G. Bulgarini, A. Fognini, R. W. Heeres, B. J. Witek, M. A. M. Versteegh, A. Rubino, T. Braun, M. Kamp, S. Höfling, D. Dalacu, J. Lapointe, P. J. Poole, and V. Zwiller, “Overcoming power broadening of the quantum dot emission in a pure wurtzite nanowire,” Phys. Rev. B 93, 195316 (2016).
[Crossref]

D. Dalacu, K. Mnaymneh, J. Lapointe, X. Wu, P. J. Poole, G. Bulgarini, V. Zwiller, and M. E. Reimer, “Ultraclean emission from InAsP quantum dots in defect-free wurtzite inp nanowires,” Nano Lett. 12, 5919–5923 (2012).
[Crossref]

M. E. Reimer, G. Bulgarini, N. Akopian, M. Hocevar, M. B. Bavinck, M. A. Verheijen, E. P. A. M. Bakkers, L. P. Kouwenhoven, and V. Zwiller, “Bright single-photon sources in bottom-up tailored nanowires,” Nat. Commun. 3, 737 (2012).
[Crossref]

Carter, S. G.

M. K. Yakes, L. Yang, A. S. Bracker, T. M. Sweeney, P. G. Brereton, M. Kim, C. S. Kim, P. M. Vora, D. Park, S. G. Carter, and D. Gammon, “Leveraging crystal anisotropy for deterministic growth of InAs quantum dots with narrow optical linewidths,” Nano Lett. 13, 4870–4875 (2013).
[Crossref]

Chen, Y.

Y. Chen, I. E. Zadeh, K. D. Jöns, A. Fognini, M. E. Reimer, J. Zhang, D. Dalacu, P. J. Poole, F. Ding, V. Zwiller, and O. G. Schmidt, “Controlling the exciton energy of a nanowire quantum dot by strain fields,” Appl. Phys. Lett. 108, 182103 (2016).
[Crossref]

Cheng, J.

M. V. Gurudev Dutt, J. Cheng, Y. Wu, X. Xu, D. G. Steel, A. S. Bracker, D. Gammon, S. E. Economou, R.-B. Liu, and L. J. Sham, “Ultrafast optical control of electron spin coherence in charged GaAs quantum dots,” Phys. Rev. B 74, 125306 (2006).
[Crossref]

Choi, K.

M. J. Holmes, K. Choi, S. Kako, M. Arita, and Y. Arakawa, “Room-temperature triggered single photon emission from a III-nitride site-controlled nanowire quantum dot,” Nano Lett. 14, 982–986 (2014).
[Crossref]

Dalacu, D.

M. E. Reimer, G. Bulgarini, A. Fognini, R. W. Heeres, B. J. Witek, M. A. M. Versteegh, A. Rubino, T. Braun, M. Kamp, S. Höfling, D. Dalacu, J. Lapointe, P. J. Poole, and V. Zwiller, “Overcoming power broadening of the quantum dot emission in a pure wurtzite nanowire,” Phys. Rev. B 93, 195316 (2016).
[Crossref]

K. G. Lagoudakis, P. L. McMahon, K. A. Fischer, S. Puri, K. Müller, D. Dalacu, P. J. Poole, M. E. Reimer, V. Zwiller, Y. Yamamoto, and J. Vuckovic, “Initialization of a spin qubit in a site-controlled nanowire quantum dot,” New J. Phys. 18, 053024 (2016).
[Crossref]

Y. Chen, I. E. Zadeh, K. D. Jöns, A. Fognini, M. E. Reimer, J. Zhang, D. Dalacu, P. J. Poole, F. Ding, V. Zwiller, and O. G. Schmidt, “Controlling the exciton energy of a nanowire quantum dot by strain fields,” Appl. Phys. Lett. 108, 182103 (2016).
[Crossref]

M. A. M. Versteegh, M. E. Reimer, K. D. Jöns, D. Dalacu, P. J. Poole, A. Gulinatti, A. Giudice, and V. Zwiller, “Observation of strongly entangled photon pairs from a nanowire quantum dot,” Nat. Commun. 5, 5298 (2014).
[Crossref]

T. Huber, A. Predojević, M. Khoshnegar, D. Dalacu, P. J. Poole, H. Majedi, and G. Weihs, “Polarization entangled photons from quantum dots embedded in nanowires,” Nano Lett. 14, 7107–7114 (2014).
[Crossref]

D. Dalacu, K. Mnaymneh, J. Lapointe, X. Wu, P. J. Poole, G. Bulgarini, V. Zwiller, and M. E. Reimer, “Ultraclean emission from InAsP quantum dots in defect-free wurtzite inp nanowires,” Nano Lett. 12, 5919–5923 (2012).
[Crossref]

De Greve, K.

Dimastrodonato, V.

G. Juska, V. Dimastrodonato, L. O. Mereni, A. Gocalinska, and E. Pelucchi, “Towards quantum-dot arrays of entangled photon emitters,” Nat. Photonics 7, 527–531 (2013).
[Crossref]

Ding, F.

Y. Chen, I. E. Zadeh, K. D. Jöns, A. Fognini, M. E. Reimer, J. Zhang, D. Dalacu, P. J. Poole, F. Ding, V. Zwiller, and O. G. Schmidt, “Controlling the exciton energy of a nanowire quantum dot by strain fields,” Appl. Phys. Lett. 108, 182103 (2016).
[Crossref]

Economou, S. E.

M. V. Gurudev Dutt, J. Cheng, Y. Wu, X. Xu, D. G. Steel, A. S. Bracker, D. Gammon, S. E. Economou, R.-B. Liu, and L. J. Sham, “Ultrafast optical control of electron spin coherence in charged GaAs quantum dots,” Phys. Rev. B 74, 125306 (2006).
[Crossref]

Ellis, D. J. P.

A. Jamil, J. Skiba-Szymanska, S. Kalliakos, A. Schwagmann, M. B. Ward, Y. Brody, D. J. P. Ellis, I. Farrer, J. P. Griffiths, G. A. C. Jones, D. A. Ritchie, and A. J. Shields, “On-chip generation and guiding of quantum light from a site-controlled quantum dot,” Appl. Phys. Lett. 104, 101108 (2014).
[Crossref]

Enderlin, A.

R. Melet, V. Voliotis, A. Enderlin, D. Roditchev, X. L. Wang, T. Guillet, and R. Grousson, “Resonant excitonic emission of a single quantum dot in the Rabi regime,” Phys. Rev. B 78, 073301 (2008).
[Crossref]

Erland, J.

N. H. Bonadeo, J. Erland, D. Gammon, D. Park, D. S. Katzer, and D. G. Steel, “Coherent optical control of the quantum state of a single quantum dot,” Science 282, 1473–1476 (1998).
[Crossref]

Esfandyarpour, V.

Ester, P.

S. Stufler, P. Ester, A. Zrenner, and M. Bichler, “Ramsey fringes in an electric-field-tunable quantum dot system,” Phys. Rev. Lett. 96, 037402 (2006).
[Crossref]

S. Stufler, P. Machnikowski, P. Ester, M. Bichler, V. M. Axt, T. Kuhn, and A. Zrenner, “Two-photon Rabi oscillations in a single InxGa1−xAs-GaAs quantum dot,” Phys. Rev. B 73, 125304 (2006).
[Crossref]

S. Stufler, P. Ester, A. Zrenner, and M. Bichler, “Quantum optical properties of a single InxGa1−xAs-GaAs quantum dot two-level system,” Phys. Rev. B 72, 121301 (2005).
[Crossref]

Fafard, S.

M. Bayer, G. Ortner, O. Stern, A. Kuther, A. A. Gorbunov, A. Forchel, P. Hawrylak, S. Fafard, K. Hinzer, T. L. Reinecke, S. N. Walck, J. P. Reithmaier, F. Klopf, and F. Schafer, “Fine structure of neutral and charged excitons in self-assembled In(Ga)As/(Al)GaAs quantum dots,” Phys. Rev. B 65, 195315 (2002).
[Crossref]

Farrer, I.

A. Jamil, J. Skiba-Szymanska, S. Kalliakos, A. Schwagmann, M. B. Ward, Y. Brody, D. J. P. Ellis, I. Farrer, J. P. Griffiths, G. A. C. Jones, D. A. Ritchie, and A. J. Shields, “On-chip generation and guiding of quantum light from a site-controlled quantum dot,” Appl. Phys. Lett. 104, 101108 (2014).
[Crossref]

Fejer, M. M.

Findeis, F.

A. Zrenner, E. Beham, S. Stufler, F. Findeis, M. Bichler, and G. Abstreiter, “Coherent properties of a two-level system based on a quantum-dot photodiode,” Nature 418, 612–614 (2002).
[Crossref]

Finley, J. J.

K. Müller, T. Kaldewey, R. Ripszam, J. S. Wildmann, A. Bechtold, M. Bichler, G. Koblmüller, G. Abstreiter, and J. J. Finley, “All optical quantum control of a spin-quantum state and ultrafast transduction into an electric current,” Sci. Rep. 3, 1906 (2013).

Fischer, K. A.

K. G. Lagoudakis, P. L. McMahon, K. A. Fischer, S. Puri, K. Müller, D. Dalacu, P. J. Poole, M. E. Reimer, V. Zwiller, Y. Yamamoto, and J. Vuckovic, “Initialization of a spin qubit in a site-controlled nanowire quantum dot,” New J. Phys. 18, 053024 (2016).
[Crossref]

Fognini, A.

M. E. Reimer, G. Bulgarini, A. Fognini, R. W. Heeres, B. J. Witek, M. A. M. Versteegh, A. Rubino, T. Braun, M. Kamp, S. Höfling, D. Dalacu, J. Lapointe, P. J. Poole, and V. Zwiller, “Overcoming power broadening of the quantum dot emission in a pure wurtzite nanowire,” Phys. Rev. B 93, 195316 (2016).
[Crossref]

Y. Chen, I. E. Zadeh, K. D. Jöns, A. Fognini, M. E. Reimer, J. Zhang, D. Dalacu, P. J. Poole, F. Ding, V. Zwiller, and O. G. Schmidt, “Controlling the exciton energy of a nanowire quantum dot by strain fields,” Appl. Phys. Lett. 108, 182103 (2016).
[Crossref]

Forchel, A.

C. Schneider, T. Heindel, A. Huggenberger, T. A. Niederstrasser, S. Reitzenstein, A. Forchel, S. Höfling, and M. Kamp, “Microcavity enhanced single photon emission from an electrically driven site-controlled quantum dot,” Appl. Phys. Lett. 100, 091108 (2012).
[Crossref]

J. S. Pelc, L. Yu, K. De Greve, P. L. McMahon, C. M. Natarajan, V. Esfandyarpour, S. Maier, C. Schneider, M. Kamp, S. Höfling, R. H. Hadfield, A. Forchel, Y. Yamamoto, and M. M. Fejer, “Downconversion quantum interface for a single quantum dot spin and 1550-nm single-photon channel,” Opt. Express 20, 27510–27519 (2012).
[Crossref]

M. Bayer, G. Ortner, O. Stern, A. Kuther, A. A. Gorbunov, A. Forchel, P. Hawrylak, S. Fafard, K. Hinzer, T. L. Reinecke, S. N. Walck, J. P. Reithmaier, F. Klopf, and F. Schafer, “Fine structure of neutral and charged excitons in self-assembled In(Ga)As/(Al)GaAs quantum dots,” Phys. Rev. B 65, 195315 (2002).
[Crossref]

Fox, A. M.

A. J. Ramsay, T. M. Godden, S. J. Boyle, E. M. Gauger, A. Nazir, B. W. Lovett, A. M. Fox, and M. S. Skolnick, “Phonon-induced Rabi-frequency renormalization of optically driven single InGaAs/GaAs quantum dots,” Phys. Rev. Lett. 105, 177402 (2010).
[Crossref]

R. S. Kolodka, A. J. Ramsay, J. Skiba-Szymanska, P. W. Fry, H. Y. Liu, A. M. Fox, and M. S. Skolnick, “Inversion recovery of single quantum-dot exciton based qubit,” Phys. Rev. B 75, 193306 (2007).
[Crossref]

A. J. Ramsay, R. S. Kolodka, F. Bello, P. W. Fry, W. K. Ng, A. Tahraoui, H. Y. Liu, M. Hopkinson, D. M. Whittaker, A. M. Fox, and M. S. Skolnick, “Coherent response of a quantum dot exciton driven by a rectangular spectrum optical pulse,” Phys. Rev. B 75, 113302 (2007).
[Crossref]

Fry, P. W.

A. J. Ramsay, R. S. Kolodka, F. Bello, P. W. Fry, W. K. Ng, A. Tahraoui, H. Y. Liu, M. Hopkinson, D. M. Whittaker, A. M. Fox, and M. S. Skolnick, “Coherent response of a quantum dot exciton driven by a rectangular spectrum optical pulse,” Phys. Rev. B 75, 113302 (2007).
[Crossref]

R. S. Kolodka, A. J. Ramsay, J. Skiba-Szymanska, P. W. Fry, H. Y. Liu, A. M. Fox, and M. S. Skolnick, “Inversion recovery of single quantum-dot exciton based qubit,” Phys. Rev. B 75, 193306 (2007).
[Crossref]

Galushko, D.

Y. Benny, S. Khatsevich, Y. Kodriano, E. Poem, R. Presman, D. Galushko, P. M. Petroff, and D. Gershoni, “Coherent optical writing and reading of the exciton spin state in single quantum dots,” Phys. Rev. Lett. 106, 040504 (2011).
[Crossref]

Gammon, D.

M. K. Yakes, L. Yang, A. S. Bracker, T. M. Sweeney, P. G. Brereton, M. Kim, C. S. Kim, P. M. Vora, D. Park, S. G. Carter, and D. Gammon, “Leveraging crystal anisotropy for deterministic growth of InAs quantum dots with narrow optical linewidths,” Nano Lett. 13, 4870–4875 (2013).
[Crossref]

M. V. Gurudev Dutt, J. Cheng, Y. Wu, X. Xu, D. G. Steel, A. S. Bracker, D. Gammon, S. E. Economou, R.-B. Liu, and L. J. Sham, “Ultrafast optical control of electron spin coherence in charged GaAs quantum dots,” Phys. Rev. B 74, 125306 (2006).
[Crossref]

T. H. Stievater, X. Li, D. G. Steel, D. Gammon, D. S. Katzer, D. Park, C. Piermarocchi, and L. J. Sham, “Rabi oscillations of excitons in single quantum dots,” Phys. Rev. Lett. 87, 133603 (2001).
[Crossref]

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M. A. M. Versteegh, M. E. Reimer, K. D. Jöns, D. Dalacu, P. J. Poole, A. Gulinatti, A. Giudice, and V. Zwiller, “Observation of strongly entangled photon pairs from a nanowire quantum dot,” Nat. Commun. 5, 5298 (2014).
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Y. Kodriano, I. Schwartz, E. Poem, Y. Benny, R. Presman, T. A. Truong, P. M. Petroff, and D. Gershoni, “Complete control of a matter qubit using a single picosecond laser pulse,” Phys. Rev. B 85, 241304 (2012).
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A. J. Ramsay, R. S. Kolodka, F. Bello, P. W. Fry, W. K. Ng, A. Tahraoui, H. Y. Liu, M. Hopkinson, D. M. Whittaker, A. M. Fox, and M. S. Skolnick, “Coherent response of a quantum dot exciton driven by a rectangular spectrum optical pulse,” Phys. Rev. B 75, 113302 (2007).
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M. V. Gurudev Dutt, J. Cheng, Y. Wu, X. Xu, D. G. Steel, A. S. Bracker, D. Gammon, S. E. Economou, R.-B. Liu, and L. J. Sham, “Ultrafast optical control of electron spin coherence in charged GaAs quantum dots,” Phys. Rev. B 74, 125306 (2006).
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A. J. Ramsay, T. M. Godden, S. J. Boyle, E. M. Gauger, A. Nazir, B. W. Lovett, A. M. Fox, and M. S. Skolnick, “Phonon-induced Rabi-frequency renormalization of optically driven single InGaAs/GaAs quantum dots,” Phys. Rev. Lett. 105, 177402 (2010).
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K. G. Lagoudakis, P. L. McMahon, K. A. Fischer, S. Puri, K. Müller, D. Dalacu, P. J. Poole, M. E. Reimer, V. Zwiller, Y. Yamamoto, and J. Vuckovic, “Initialization of a spin qubit in a site-controlled nanowire quantum dot,” New J. Phys. 18, 053024 (2016).
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B. J. Witek, R. W. Heeres, U. Perinetti, E. P. A. M. Bakkers, L. P. Kouwenhoven, and V. Zwiller, “Measurement of the g-factor tensor in a quantum dot and disentanglement of exciton spins,” Phys. Rev. B 84, 195305 (2011).
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M. V. Gurudev Dutt, J. Cheng, Y. Wu, X. Xu, D. G. Steel, A. S. Bracker, D. Gammon, S. E. Economou, R.-B. Liu, and L. J. Sham, “Ultrafast optical control of electron spin coherence in charged GaAs quantum dots,” Phys. Rev. B 74, 125306 (2006).
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S. Stufler, P. Ester, A. Zrenner, and M. Bichler, “Ramsey fringes in an electric-field-tunable quantum dot system,” Phys. Rev. Lett. 96, 037402 (2006).
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S. Stufler, P. Machnikowski, P. Ester, M. Bichler, V. M. Axt, T. Kuhn, and A. Zrenner, “Two-photon Rabi oscillations in a single InxGa1−xAs-GaAs quantum dot,” Phys. Rev. B 73, 125304 (2006).
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S. Stufler, P. Ester, A. Zrenner, and M. Bichler, “Quantum optical properties of a single InxGa1−xAs-GaAs quantum dot two-level system,” Phys. Rev. B 72, 121301 (2005).
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A. Zrenner, E. Beham, S. Stufler, F. Findeis, M. Bichler, and G. Abstreiter, “Coherent properties of a two-level system based on a quantum-dot photodiode,” Nature 418, 612–614 (2002).
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M. E. Reimer, G. Bulgarini, A. Fognini, R. W. Heeres, B. J. Witek, M. A. M. Versteegh, A. Rubino, T. Braun, M. Kamp, S. Höfling, D. Dalacu, J. Lapointe, P. J. Poole, and V. Zwiller, “Overcoming power broadening of the quantum dot emission in a pure wurtzite nanowire,” Phys. Rev. B 93, 195316 (2016).
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K. G. Lagoudakis, P. L. McMahon, K. A. Fischer, S. Puri, K. Müller, D. Dalacu, P. J. Poole, M. E. Reimer, V. Zwiller, Y. Yamamoto, and J. Vuckovic, “Initialization of a spin qubit in a site-controlled nanowire quantum dot,” New J. Phys. 18, 053024 (2016).
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Y. Chen, I. E. Zadeh, K. D. Jöns, A. Fognini, M. E. Reimer, J. Zhang, D. Dalacu, P. J. Poole, F. Ding, V. Zwiller, and O. G. Schmidt, “Controlling the exciton energy of a nanowire quantum dot by strain fields,” Appl. Phys. Lett. 108, 182103 (2016).
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M. A. M. Versteegh, M. E. Reimer, K. D. Jöns, D. Dalacu, P. J. Poole, A. Gulinatti, A. Giudice, and V. Zwiller, “Observation of strongly entangled photon pairs from a nanowire quantum dot,” Nat. Commun. 5, 5298 (2014).
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M. E. Reimer, G. Bulgarini, N. Akopian, M. Hocevar, M. B. Bavinck, M. A. Verheijen, E. P. A. M. Bakkers, L. P. Kouwenhoven, and V. Zwiller, “Bright single-photon sources in bottom-up tailored nanowires,” Nat. Commun. 3, 737 (2012).
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D. Dalacu, K. Mnaymneh, J. Lapointe, X. Wu, P. J. Poole, G. Bulgarini, V. Zwiller, and M. E. Reimer, “Ultraclean emission from InAsP quantum dots in defect-free wurtzite inp nanowires,” Nano Lett. 12, 5919–5923 (2012).
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B. J. Witek, R. W. Heeres, U. Perinetti, E. P. A. M. Bakkers, L. P. Kouwenhoven, and V. Zwiller, “Measurement of the g-factor tensor in a quantum dot and disentanglement of exciton spins,” Phys. Rev. B 84, 195305 (2011).
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M. E. Reimer, M. P. van Kouwen, A. W. Hidma, M. H. M. van Weert, E. P. A. M. Bakkers, L. P. Kouwenhoven, and V. Zwiller, “Electric field induced removal of the biexciton binding energy in a single quantum dot,” Nano Lett. 11, 645–650 (2011).
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Appl. Phys. Lett. (4)

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J. Tommila, V. V. Belykh, T. V. Hakkarainen, E. Heinonen, N. N. Sibeldin, A. Schramm, and M. Guina, “Cavity-enhanced single photon emission from site-controlled In(Ga)As quantum dots fabricated using nanoimprint lithography,” Appl. Phys. Lett. 104, 213104 (2014).
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Y. Chen, I. E. Zadeh, K. D. Jöns, A. Fognini, M. E. Reimer, J. Zhang, D. Dalacu, P. J. Poole, F. Ding, V. Zwiller, and O. G. Schmidt, “Controlling the exciton energy of a nanowire quantum dot by strain fields,” Appl. Phys. Lett. 108, 182103 (2016).
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Comput. Phys. Commun. (1)

J. R. Johansson, P. D. Nation, and F. Nori, “QuTiP 2: A Python framework for the dynamics of open quantum systems,” Comput. Phys. Commun. 184, 1234–1240 (2013).
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Nano Lett. (6)

T. Huber, A. Predojević, M. Khoshnegar, D. Dalacu, P. J. Poole, H. Majedi, and G. Weihs, “Polarization entangled photons from quantum dots embedded in nanowires,” Nano Lett. 14, 7107–7114 (2014).
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K. D. Jöns, P. Atkinson, M. Müller, M. Heldmaier, S. M. Ulrich, O. G. Schmidt, and P. Michler, “Triggered indistinguishable single photons with narrow line widths from site-controlled quantum dots,” Nano Lett. 13, 126–130 (2013).
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M. K. Yakes, L. Yang, A. S. Bracker, T. M. Sweeney, P. G. Brereton, M. Kim, C. S. Kim, P. M. Vora, D. Park, S. G. Carter, and D. Gammon, “Leveraging crystal anisotropy for deterministic growth of InAs quantum dots with narrow optical linewidths,” Nano Lett. 13, 4870–4875 (2013).
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M. E. Reimer, M. P. van Kouwen, A. W. Hidma, M. H. M. van Weert, E. P. A. M. Bakkers, L. P. Kouwenhoven, and V. Zwiller, “Electric field induced removal of the biexciton binding energy in a single quantum dot,” Nano Lett. 11, 645–650 (2011).
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Nat. Commun. (2)

M. A. M. Versteegh, M. E. Reimer, K. D. Jöns, D. Dalacu, P. J. Poole, A. Gulinatti, A. Giudice, and V. Zwiller, “Observation of strongly entangled photon pairs from a nanowire quantum dot,” Nat. Commun. 5, 5298 (2014).
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M. E. Reimer, G. Bulgarini, N. Akopian, M. Hocevar, M. B. Bavinck, M. A. Verheijen, E. P. A. M. Bakkers, L. P. Kouwenhoven, and V. Zwiller, “Bright single-photon sources in bottom-up tailored nanowires,” Nat. Commun. 3, 737 (2012).
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Nat. Photonics (1)

G. Juska, V. Dimastrodonato, L. O. Mereni, A. Gocalinska, and E. Pelucchi, “Towards quantum-dot arrays of entangled photon emitters,” Nat. Photonics 7, 527–531 (2013).
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Nature (1)

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New J. Phys. (1)

K. G. Lagoudakis, P. L. McMahon, K. A. Fischer, S. Puri, K. Müller, D. Dalacu, P. J. Poole, M. E. Reimer, V. Zwiller, Y. Yamamoto, and J. Vuckovic, “Initialization of a spin qubit in a site-controlled nanowire quantum dot,” New J. Phys. 18, 053024 (2016).
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Opt. Express (2)

Phys. Rev. B (11)

M. V. Gurudev Dutt, J. Cheng, Y. Wu, X. Xu, D. G. Steel, A. S. Bracker, D. Gammon, S. E. Economou, R.-B. Liu, and L. J. Sham, “Ultrafast optical control of electron spin coherence in charged GaAs quantum dots,” Phys. Rev. B 74, 125306 (2006).
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Y. Kodriano, I. Schwartz, E. Poem, Y. Benny, R. Presman, T. A. Truong, P. M. Petroff, and D. Gershoni, “Complete control of a matter qubit using a single picosecond laser pulse,” Phys. Rev. B 85, 241304 (2012).
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R. S. Kolodka, A. J. Ramsay, J. Skiba-Szymanska, P. W. Fry, H. Y. Liu, A. M. Fox, and M. S. Skolnick, “Inversion recovery of single quantum-dot exciton based qubit,” Phys. Rev. B 75, 193306 (2007).
[Crossref]

S. Stufler, P. Ester, A. Zrenner, and M. Bichler, “Quantum optical properties of a single InxGa1−xAs-GaAs quantum dot two-level system,” Phys. Rev. B 72, 121301 (2005).
[Crossref]

Q. Q. Wang, A. Muller, P. Bianucci, E. Rossi, Q. K. Xue, T. Takagahara, C. Piermarocchi, A. H. MacDonald, and C. K. Shih, “Decoherence processes during optical manipulation of excitonic qubits in semiconductor quantum dots,” Phys. Rev. B 72, 035306 (2005).
[Crossref]

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Other (2)

P. L. McMahon and K. De Greve, in Engineering the Atom-Photon Interaction, A. Predojevic and M. W. Mitchell, eds. (Springer, 2015), Chap. 14.

The exact simulation parameters that were used are: ΔEgs/2π=104.2  GHz, ΔEtr/2π=15.1  GHz, ω0/2π=333·103  GHz, Ω/2π ∈(0,4.46)  GHz, ΔEtr/2π=15.1  GHz, ΔωL/2π∈(−20,20)  GHz, γspontaneous=1  ns−1, γpumping=50420·γspontaneous, γdephasing=1145·10−3  ns−1 [αphonon=13.6·10−3  ns−1, τFWHM=23  psec], and the time-dependent collapse operators are sjjαphonon(Ω(t)+Ω(t−Δt)), j=3,4.

Supplementary Material (1)

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» Supplement 1: PDF (2865 KB)      Supplemental-document

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Figures (5)

Fig. 1.
Fig. 1. (a) Photoluminescence intensity of the QD emission as a function of the above-band power; the emission is split in two orthogonal linear polarizations. Emissions from both polarizations have a linear power dependence. (b) Magnetic-field dependence of the QD transition energies for the two polarizations obtained from the magneto-photoluminescence spectra (see Supplement 1 for details). (c) Polarization analysis of the photoluminescence when a B = 5    T field is applied. (d) Four-level structure of the charged QD in a magnetic field. The optically excited states are the trions (3,4), whereas the ground states are the spin states (1,2). The gray downward-wavy lines denote spontaneous emission channels. The weak above-band resetting laser is depicted as the violet upward-wavy arrows. Photons are solely detected from the diagonal | | transition. The driving pulses are resonant with the | | transition (double-sided arrow).
Fig. 2.
Fig. 2. (a) Rabi oscillations of the trion qubit. The detected counts from the | | transition are proportional to the probability of the qubit being in state | . The pulses, which are resonant with the | | transition, cause rotations of the qubit, which begins in the state | . The solid red line is a fit from the model. The inset depicts the Bloch sphere and its principle axes. (b) Modeled Rabi oscillations for a range of driving pulse detunings.
Fig. 3.
Fig. 3. (a) Ramsey interference experiment where the qubit is driven by two π / 2 pulses separated by a variable delay. Here, the coarse delay is 80 ps and the fine delay is scanned over 11 fsec, revealing oscillations that are due to quantum interference. The solid red line is a fit from the model. (b) Modeled Ramsey interference for a range of resonant pulse detunings. Detuning the pulse introduces a linear phase shift of the interference fringes and causes a reduction in their amplitude.
Fig. 4.
Fig. 4. (a) Determination of T 2 * using the decay of the Ramsey fringe amplitude as a function of the coarse delay. Note that the initial delay that is used in this experiment is 80 ps. The solid red line is a fit from the model with a decay time of 43 ps. (b) Modeled Ramsey fringe amplitude decay as a function of the coarse delay for a range of resonant pulse detunings. Although the amplitude gradually reduces when the detuning is increased, the decay time remains the same.
Fig. 5.
Fig. 5. (a) Detected counts when the system is manipulated with two pulses of variable power and variable delay. This allows access to the full Bloch sphere (complete coherent control). The tilt of the lobes for low pulse powers originates from the non-zero detuning of the resonant pulses used in this experiment ( Δ ω L / 2 π 14.5    GHz ). (b) Modeled complete coherent control, with parameters set to match those used in the experiment.

Equations (4)

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ω L = ω 0 Δ E t r 2 Δ E g s 2 Δ ω L ,
H o = Δ E g s 2 s 11 + Δ E g s 2 s 22 + ( ω 0 Δ E t r 2 ) s 33 + ( ω 0 + Δ E t r 2 ) s 44
H D = ( s 14 + s 23 ) ( Ω ( t ) + Ω ( t Δ t ) e i ω L Δ t ) + ( s 41 + s 32 ) ( Ω ( t ) + Ω ( t Δ t ) e i ω L Δ t ) ,
d ρ ˜ ( t ) d t = i [ H ˜ , ρ ˜ ( t ) ] + j L ( c j )

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