Abstract

We propose a new scheme for achieving the complete population transfer and the optimal coherence generation between the ground state and the Rydberg state in a four-level ladder system by combining the STIRAP or fractional STIRAP technique and the π pulse technique. We consider, in particular, two different situations where spontaneous emission from the two highest states are neglected or not. Our numerical calculations show that the time width and the delay time of the π pulse are two critical parameters for attaining the maximal population transfer and coherence generation in this scheme.

© 2011 OSA

1. Introduction

Efficient control of atomic coherence and population transfer is a basic requirement for many experimental studies in the field of quantum optics and therefore has attracted great attention in the past two decades. Accordingly, a lot of significant progress has been made in different parametric regions corresponding, respectively, to coherent population trapping [1], electromagnetically induced transparency [2], laser without population inversion [3], spontaneous emission cancellation [4], and spectral line narrowing [5]. So far stimulated Raman adiabatic passage (STIRAP) [6] has been proven to be an efficient and robust technique for the complete population transfer from one state to another state of atoms or molecules. On the other hand, fractional STIRAP (a slightly modified version of STIRAP) can be explored to transfer a part of population from one atomic state into another atomic state and simultaneously create an arbitrary coherence between them [7]. As is well known, many works on STIRAP or fractional STIRAP are done with the simplest three-level Λ system to attain different goals [8,9]. Apart from the three-level Λ system, the four-level tripod system is also extensively studied in theory [10,11] or in experiment [12,13] as far as STIRAP or fractional STIRAP is concerned.

Recently the STIRAP or fractional STIRAP technique has been extended by several groups to the three-level ladder system, which has potential applications in achieving short wavelength lasing and quantum logic gates based on the dipole blockade effect [14]. In particular, Sangouard et al. proposed an interesting technique to prepare coherent superpositions of two non-degenerate quantum states in a three-level ladder system driven by two coherent light pulses [15]. This technique utilizes an adiabatic passage assisted by dynamic Stark shifts induced by a third laser field and can be applied to enhance certain nonlinear optical processes. Moreover, Camp et al. examined by numerical calculations the population dynamics of a coherently driven three-level ladder system without assuming the adiabaticity of atom-field interaction [16]. Last but not least, Fernandez et al. demonstrated a STIRAP-like process to efficiently control the vibro-rotational states of Na2 molecules in the case where lifetimes of the intermediate state and the highest state are much shorter than the atom-field interaction duration [17].

In this paper, we present a new scheme for achieving efficient population transfer and coherence generation in a four-level ladder system with the STIRAP technique, the fractional STIRAP technique, and the π pulse technique. This scheme depends on the application of three coherent light pulses with carefully chosen Rabi frequencies, time widths, and delay times. Our numerical results show that, for a realistic four-level ladder system with all spontaneous decay rates suitably considered, about 90% atomic population can be coherently transferred into the highest state from the ground state by combining the STIRAP technique and the π pulse technique; atomic coherence between the ground state and the highest state may exceed 0.43 when the fractional STIRAP technique and the π pulse technique are adopted instead. In particular, the highest state is assumed here to be a Rydberg state so that its atomic population and atomic coherence can be kept for at least several microseconds, which is much longer than the atom-field interaction time (typically several hundreds of nanoseconds). Compared with the three-level ladder system, the four-level ladder system has two special advantages: it can be controlled by modulating the applied light pulses with more freedoms; it has an electric-dipole allowed transition between the ground state and the highest state.

2. Theoretical model and equations

We illustrate in Fig. 1 a four-level ladder-type atomic system, in which a pump pulse of central frequency ωp and a Stokes pulse of central frequency ωs may coherently transfer atoms from state |1〉 to state |3〉 without populating state |2〉 via the STIRAP or fractional STIRAP technique. In addition, a π pulse of central frequency ωπ is applied to further transfer atoms from state |3〉 to state |4〉, which will be assumed to be a long-lived Rydberg state in what follows. We also assume that the pump pulse is detuned from transition |1〉 ↔ |2〉 by Δ2 = ω 21ωp, the Stokes pulse is detuned from transition |2〉 ↔ |3〉 by Δ3 = ω 32ωs, while the π-pulse is always resonant with transition |3〉 ↔ |4〉 (i.e. ω 43 = ωπ).

 

Fig. 1 Energy-level diagram of a four-level ladder-type atomic system with Ωp, Ωs, and Ωπ being, respectively, Rabi frequencies of the applied pump, Stokes, and π pulses.

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For the purpose of efficient population transfer from state |1〉 to state |4〉, we will set the three light pulses mentioned above to have Gaussian profiles in the time domain so that their Rabi frequencies can be described by Ωs(t)=Ωs0et2/Ts2, Ωp(t)=Ωp0e(tτp)2/Tp2 and Ωπ(t)=Ωπ0e(tτπ2)2/Tπ2. Here τi (i = p, π) is the delay time of the pump pulse or the π pulse relative to the Stokes pulse; Ti (i = s, p, π) is the time width of the Stokes pulse, the pump pulse, or the π pulse; Ωi 0 (i = s, p, π) is the peak Rabi frequency of the Stokes pulse, the pump pulse, or the π pulse. Note, in particular, that the STIRAP or fractional STIRAP technique requires a counter-intuitive order of the pump and Stokes pulses with τp > 0 and the π pulse should satisfy the following equation

A(t)=Ωπ0e(tτπ)2Tπ2dt=π,
which then results in
Ωπ0Tπ=π

In the framework of the semiclassical theory, under the electric-dipole approximation and the rotating-wave approximation, we can represent the Hamiltonian in the interaction picture as

HI=(0Ωs(t)00Ωs*(t)Δ2Ωp(t)00Ωp*(t)Δ2+Δ3Ωπ(t)00Ωπ*(t)Δ2+Δ3)

The master equation of motion for the density operator in an arbitrary multilevel atomic system is usually written as

ih¯ρt=[HI,ρ]12ih¯[Γ,ρ]

By expanding Eq. (4), we can easily arrive at the following dynamic equations

ρ˙11=iΩpρ12+iΩp*ρ21+Γ21ρ22+Γ41ρ44,ρ˙22=iΩpρ12iΩp*ρ21iΩsρ23+iΩs*ρ32Γ21ρ22+Γ32ρ33,ρ˙33=iΩsρ23iΩs*ρ32iΩπρ34+iΩπ*ρ43Γ32ρ33+Γ43ρ44,ρ˙44=iΩπρ34iΩπ*ρ43(Γ41+Γ43)ρ44,ρ˙12=iΩp*(ρ11ρ22)iΩsρ13+iΔ2ρ12γ21ρ12,ρ˙13=iΩp*ρ23iΩs*ρ12iΩπρ14+i(Δ2+Δ3)ρ13γ31ρ13,ρ˙14=iΩp*ρ24iΩπ*ρ13+i(Δ2+Δ3)ρ14γ41ρ14,ρ˙23=iΩpρ13+iΩs*(ρ33ρ22)iΩπρ24+iΔ2ρ23γ32ρ23.
constrained by ρij=ρji* and Tr(ρ) = 1. In Eqs. (5), Γij describes the population decay rate from state |i〉 to state |j〉 due to spontaneous emission while γ 21 = Γ21/2, γ 31 = Γ32/2, γ 41 = (Γ41 + Γ43)/2, and γ 32 = (Γ21 + Γ32)/2 are the coherence decay rates on relevant transitions.

Considering that all three coherent fields are laser pulses, we also need the Maxwellian wave equations to numerically examine the dynamic evolution of atomic population and atomic coherence, which finally turn into

Ωpz+1cΩpt=iκ12ρ21,Ωsz+1cΩst=iκ23ρ32,Ωπz+1cΩπt=iκ34ρ43.
in the slowly-varying envelope approximation. In Eqs. (6), κ 21 = ωpN|d 12|2/ε 0 ch̄, κ 32 = ωsN|d 23|2 0 ch̄, and κ 34 = ωπN|d 34|2/ε 0 ch̄ are coupling constants, respectively, for the Stokes pulse, the pump pulse, and the π pulse with N being the atomic density, ε 0 the permittivity in vacuum, and c the light speed in vacuum.

3. Numerical results and discussions

3.1. Population transfer

In this subsection, we explore the possibility of achieving the maximal population transfer from the ground state |1〉 to the Rydberg state |4〉 by combining the STIRAP technique and the π pulse technique. The time sequence of three coherent light pulses is shown in Fig. 2(a) while atomic populations ρ 11, ρ 33, and ρ 44 are plotted against time t in Fig. 2(b). As we can see, the the pump pulse is applied after the Stokes pulse with a time delay τp in the counter-intuitive order and the full population in state |1〉 is assumed before the pump pulse arrives to trigger the atom-field interaction. When the pump pulse gradually enters the medium, atomic population is adiabatically transferred from state |1〉 to state |3〉 without populating state |2〉. This adiabatic process requires two basic conditions: the Stokes pulse should arrive before the pump pulse and extinguish first; both Stokes and pump pulses should vary slowly enough in time (i.e. have smooth rising and falling edges). The π pulse with a narrower time width (Tπ < Tp = Ts) is applied, when the pump and Stokes pulses approximately have the same Rabi frequency [Ωp(t) ≈ Ωs(t)], to further transfer atomic population from state |3〉 to state |4〉. It is clear that about 98% (88%) atomic population is finally transferred into state |4〉 for an ideal (realistic) four-level ladder system and the population in state |4〉 decays little in 200 nanoseconds because the lifetime of a high Rydberg state is several tens of microseconds.

 

Fig. 2 (Color online) (a) Time sequence of the Stokes, pump, and π pulses. The pump and π pulses are delayed from the Stokes pulse by τp and τπ, respectively. (b) Time evolution of atomic populations ρ 11, ρ 33, and ρ 44. Dashed curves are plotted for an ideal four-level ladder system with Γ32 = Γ41 = Γ43 = 0; solid curves are plotted for a realistic four-level ladder system with Γ32 = 200 kHz, Γ41 = 10 kHz, and Γ43 = 50 kHz. Other parameters are set as Δ2 = Δ3 = 0, Γ21 = 38 MHz, Ωp 0 = Ωs 0 = 400 MHz, Ωπ 0 = 40 MHz, Ts = Tp = 80 ns, Tπ = 22.15 ns, τp = 94 ns, and τπ = 77 ns.

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The time width Tπ and the delay time τπ of the π pulse are two critical parameters to attain the maximal population transfer. In Fig. 3(a), we show atomic population ρ 44 as a function of the delay time τπ for an ideal four-level system where spontaneous emissions from state |3〉 and state |4〉 are neglected. The dashed, solid, and dash-dotted curves correspond to different peak Rabi frequencies Ωπ 0 = 4 MHz, 40 MHz, 400 MHz and therefore different time widths Tπ = 221.5 ns, 22.15 ns, 2.15 ns of the π pulse. For a smaller peak Rabi frequency Ωπ 0 = 4 MHz, atomic population ρ 44 changes much slower when the delay time τπ is gradually increased and the maximal population ρ 44 ≈ 96% can only be attained with τπ > 300 ns. This is because a wider π pulse with smaller peak Rabi frequency interacts with the ideal four-level ladder system in a larger time interval and it has to be applied after state |3〉 has accumulated enough population. For the larger peak Rabi frequency (Ωπ 0 = 40 MHz or Ωπ 0 = 400 MHz), atomic population ρ 44 is more sensitive to the delay time τπ before the maximal population ρ 44 ≈ 98% is attained after τπ > 100 ns. That is, a small adjustment of the delay time τπ may result in a large change in atomic population ρ 44. In Fig. 3(b), we can find very similar dynamic behaviors for atomic population ρ 44 in a realistic four-level ladder system where spontaneous emissions from state |3〉 and state |4〉 are suitably considered. The only difference lies in that the maximal population ρ 44 is much smaller for Ωπ 0 = 4 MHz because a part of atomic population ρ 33 returns to state |1〉 due to the nonzero decay rates Γ32, Γ41, and Γ43. Thus to guarantee that the maximal population in state |4〉 is larger than 90%, we have to choose a strong enough π pulse with a suitable delay time τπ, e.g. Ωπ 0 = 40 MHz and τπ = 100 ns.

 

Fig. 3 (Color online) Atomic population ρ 44 as a function of the delay time τπ. for an ideal four-level ladder system in (a); for a realistic four-level ladder system in (b). Dashed, solid, and dash-dotted curves correspond to Ωπ 0 = 4 MHz, 40 MHz, and 400 MHz, respectively. Other parameters are the same as in Fig. 2.

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3.2. Coherence generation

In this subsection, we explore the possibility of achieving the maximal atomic coherence between state |1〉 and state |4〉 by combining the fractional STIRAP technique and the π pulse technique. The time sequence of three coherent light pulses is shown in Fig. 4(a) while atomic population and coherence ρ 11, ρ 33, ρ 44, and ρ 14 are plotted against time t in Fig. 4(b). Once again the pump pulse is applied after the Stokes pulse in the counter-intuitive order but they have the same falling edge and extinguish simultaneously instead. This is necessary to transfer only a part of atomic population out of state |1〉 and finally create large enough atomic coherence between state |1〉 and state |4〉. Figure 4(b) shows that, for an ideal four-level ladder system, 50% atomic population is adiabatically transferred into state |3〉 from state |1〉 via the fractional STIRAP technique and then is pumped into state |4〉 by a π pulse with a suitable delay time τπ. Accordingly, the maximal coherence ρ 14 ≈ 0.5 is generated between state |1〉 and state |4〉. It is worth noting that both rising edge and falling edge of the Stokes pulse are Gaussian, which are however separated by a constant peak Rabi frequency extending from t = −400 ns to t = 0.0 ns [see Fig. 4(a)].

 

Fig. 4 (Color online) (a) Time sequence of the Stokes, pump, and π pulses. The pump and Stokes pulses have the same falling edge while the π pulse is delayed from the pump pulse by τπ. (b) Time evolution of atomic population and coherence ρ 11, ρ 33, ρ 44, and ρ 14 for an ideal four-level ladder system with Γ32 = Γ41 = Γ43 = 0. Other parameters are set as Δ2 = Δ3 = 0, Γ21 = 38 MHz, Ωp 0 = Ωs 0 = 400 MHz, Ωπ 0 = 40 MHz, Ts = Tp = 80 ns, Tπ = 22.15 ns, τp = 0, and τπ = 125 ns.

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Similar to the dynamic behaviors of atomic population ρ 44 in Fig. 3(a), for a smaller peak Rabi frequency Ωπ 0 = 4 MHz, atomic coherence ρ 14 in Fig. 5(a) changes very slowly when the delay time τπ is gradually increased and the maximal coherence ρ 14 ≈ 0.5 can only be attained with a large enough delay time of τπ > 200 ns. This is also because, when the peak Rabi frequency Ωπ 0 is smaller, the π pulse will interact with the ideal four-level ladder system in a larger time interval so that its application has to be suitably postponed. For a π pulse with larger peak Rabi frequency (Ωπ 0 = 40 MHz or Ωπ 0 = 400 MHz), atomic coherence ρ 14 is more sensitive to the delay time τπ before the maximal coherence ρ 14 ≈ 0.5 is attained after τπ > 100. Note, in particular, that atomic coherence ρ 14 oscillates drastically with the delay time τπ between −100 ns < τπ < 100 ns if the peak Rabi frequency Ωπ 0 is very large. This peculiar phenomenon should be a result of the fast rising and falling edges of a narrower π pulse, which can remarkably affect the coherent population transfer between state |1〉 and state |3〉 in the case of fractional STIRAP. In Fig. 5(b), we consider instead a realistic four-level ladder system with Γ32 = 200 kHz, Γ41 = 10 kHz, and Γ43 = 50 kHz. As we can see, the maximal coherence ρ 14 is only about 0.43 and corresponds to an optimal delay time τπ ≈ 100 ns for the realistic four-level ladder system.

 

Fig. 5 (Color online) Atomic coherence ρ 14 as a function of the delay time τπ for an ideal four-level ladder system in (a); for a realistic four-level ladder system in (b). Dashed, solid, and dash-dotted curves correspond to Ωπ 0 = 4 MHz, 40 MHz, and 400 MHz, respectively. Other parameters are the same as in Fig. 4.

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4. Conclusions

In summary, we have demonstrated by numerical calculations a new scheme to optimize the population transfer (coherence generation) between the ground state and the highest state in a four-level ladder system with the STIRAP (fractional STIRAP) technique and the π pulse technique. This scheme of efficient population transfer and coherence generation are quite robust in the time scale of several hundreds of nanoseconds when the highest state refers to a long-lived Rydberg state, which however requires an appropriate selection of the time width and the delay time of the π pulse. Our results may be extended to realize short wavelength lasing between the highest state and the ground state. For example, when hyperfine states of rubidium atoms are chosen to construct the four-level ladder system, the transition wavelength between the highest state and the ground state is about 200 nm – 300 nm [18].

Acknowledgments

The authors acknowledge the financial supports from the National Basic Research Program of China (Grant No. 2011CB921603), the National Nature Science Foundation of China (Grant No. 11074097), the National Foundation for Fostering Talents of Basic Science (Grant No. J0730311), the Nature Science Foundation of Heilongjiang Province (Grant No. F200928), and the Basic Scientific Research Foundation of Jilin University.

References and links

1. H. R. Gray, R. M. Whitley, and C. R. Stroud Jr., “Coherent trapping of atomic populations,” Opt. Lett. 3, 218–220 (1978). [CrossRef]   [PubMed]  

2. K. J. Boller, A. Imamoğlu, and S. E. Harris, “Observation of electromagnetically induced transparency,” Phys. Rev. Lett. 66, 2593–2596 (1991). [CrossRef]   [PubMed]  

3. J.-Y. Gao, C. Guo, X.-Z. Guo, G.-X. Jin, Q.-W. Wang, J. Zhao, H.-Z. Zhang, Y. Jiang, D.-Z. Wang, and D.-M. Jiang, “Observation of light amplification without population inversion in sodium,” Opt. Commun. 93, 323–327 (1992). [CrossRef]  

4. S.-Y. Zhu and M. O. Scully, “Spectral line elimination and spontaneous emission cancellation via quantum interference,” Phys. Rev. Lett. 76, 388–391 (1996). [CrossRef]   [PubMed]  

5. D. J. Gauthier, Y.-F. Zhu, and T. W. Mossberg, “Observation of linewidth narrowing due to coherent stabilization of quantum fluctuations,” Phys. Rev. Lett. 66, 2460–2463 (1991). [CrossRef]   [PubMed]  

6. K. Bergmann, H. Theuer, and B. W. Shore, “Coherent population transfer among quantum states of atoms and molecules,” Rev. Mod. Phys. 70, 1003–1025 (1998). [CrossRef]  

7. V. A. Sautenkov, C.-Y. Ye, Y. V. Rostovtsev, G. R. Welch, and M. O. Scully, “Enhancement of field generation via maximal atomic coherence prepared by fast adiabatic passage in Rb vapor,” Phys. Rev. A 70, 033406 (2004). [CrossRef]  

8. Y.-P. Niu, S.-Q. Gong, R.-X. Li, and S.-Q. Jin, “Creation of atomic coherent superposition states via the technique of stimulated Raman adiabatic passage using a Λ-type system with a manifold of levels,” Phys. Rev. A 70, 023805 (2004). [CrossRef]  

9. F. Vewinger, M. Heinz, R. G. Fernandez, N. V. Vitanov, and K. Bergmann, “Creation and measurement of a coherent superposition of quantun states,” Phys. Rev. Lett. 91, 213001 (2003). [CrossRef]   [PubMed]  

10. R. G. Unanyan, M. Fleischhauer, B. W. Shore, and K. Bergmann, “Robust creation and phase-sensitive probing of superposition states via stimulated Raman adiabatic passage (STIRAP) with degenerate dark states,” Opt. Commun. 155, 144–154 (1998). [CrossRef]  

11. R. G. Unanyan, B. W. Shore, and K. Bergmann, “Laser-driven population transfer in four-level atoms: consequences of non-Abelian geometrical adiabatic phase factors,” Phys. Rev. A 59, 2910–2919 (1999). [CrossRef]  

12. H. Theuer, R. G. Unanyan, C. Habscheid, K. Klein, and K. Bergmann, “Novel laser controlled variable matter wave beamsplitter,” Opt. Express 4, 77–83 (1999). [CrossRef]   [PubMed]  

13. H. Goto and K. Ichimura, “Observation of coherent population transfer in a four-level tripod system with a rare-earth-metal-ion-doped crystal,” Phys. Rev. A 75, 033404 (2007). [CrossRef]  

14. M. Saffman and T. G. Walker, “Quantum information with Rydberg atoms,” Rev. Mod. Phys. 82, 2313–2363 (2010). [CrossRef]  

15. N. Sangouard, L. P. Yatsenko, B. W. Shore, and T. Halfmann, “Preparation of nondegenerate coherent superpositions in a three-state ladder system assisted by Stark shifts,” Phys. Rev. A 73, 043415 (2006). [CrossRef]  

16. H. A. Camp, M. H. Shah, M. L. Trachy, O. L. Weaver, and B. D. DePaola, “Numerical exploration of coherent excitation in three-level systems,” Phys. Rev. A 71, 053401 (2005). [CrossRef]  

17. R. G. Fernandez, A. Ekers, L. P. Yatsenko, N. V. Vitanov, and K. Bergmann, “Control of population flow in coherently driven quantum ladders,” Phys. Rev. Lett. 95, 043001 (2005). [CrossRef]  

18. H. Schempp, G. Gunter, C. S. Hofmann, C. Giese, S. D. Saliba, B. D. DePaola, T. Amthor, and M. Weidemuller, “Coherent population trapping with controlled interparticle interactions,” Phys. Rev. Lett. 104, 173602 (2010). [CrossRef]   [PubMed]  

References

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  1. H. R. Gray, R. M. Whitley, and C. R. Stroud, “Coherent trapping of atomic populations,” Opt. Lett. 3, 218–220 (1978).
    [CrossRef] [PubMed]
  2. K. J. Boller, A. Imamoğlu, and S. E. Harris, “Observation of electromagnetically induced transparency,” Phys. Rev. Lett. 66, 2593–2596 (1991).
    [CrossRef] [PubMed]
  3. J.-Y. Gao, C. Guo, X.-Z. Guo, G.-X. Jin, Q.-W. Wang, J. Zhao, H.-Z. Zhang, Y. Jiang, D.-Z. Wang, and D.-M. Jiang, “Observation of light amplification without population inversion in sodium,” Opt. Commun. 93, 323–327 (1992).
    [CrossRef]
  4. S.-Y. Zhu and M. O. Scully, “Spectral line elimination and spontaneous emission cancellation via quantum interference,” Phys. Rev. Lett. 76, 388–391 (1996).
    [CrossRef] [PubMed]
  5. D. J. Gauthier, Y.-F. Zhu, and T. W. Mossberg, “Observation of linewidth narrowing due to coherent stabilization of quantum fluctuations,” Phys. Rev. Lett. 66, 2460–2463 (1991).
    [CrossRef] [PubMed]
  6. K. Bergmann, H. Theuer, and B. W. Shore, “Coherent population transfer among quantum states of atoms and molecules,” Rev. Mod. Phys. 70, 1003–1025 (1998).
    [CrossRef]
  7. V. A. Sautenkov, C.-Y. Ye, Y. V. Rostovtsev, G. R. Welch, and M. O. Scully, “Enhancement of field generation via maximal atomic coherence prepared by fast adiabatic passage in Rb vapor,” Phys. Rev. A 70, 033406 (2004).
    [CrossRef]
  8. Y.-P. Niu, S.-Q. Gong, R.-X. Li, and S.-Q. Jin, “Creation of atomic coherent superposition states via the technique of stimulated Raman adiabatic passage using a Λ-type system with a manifold of levels,” Phys. Rev. A 70, 023805 (2004).
    [CrossRef]
  9. F. Vewinger, M. Heinz, R. G. Fernandez, N. V. Vitanov, and K. Bergmann, “Creation and measurement of a coherent superposition of quantun states,” Phys. Rev. Lett. 91, 213001 (2003).
    [CrossRef] [PubMed]
  10. R. G. Unanyan, M. Fleischhauer, B. W. Shore, and K. Bergmann, “Robust creation and phase-sensitive probing of superposition states via stimulated Raman adiabatic passage (STIRAP) with degenerate dark states,” Opt. Commun. 155, 144–154 (1998).
    [CrossRef]
  11. R. G. Unanyan, B. W. Shore, and K. Bergmann, “Laser-driven population transfer in four-level atoms: consequences of non-Abelian geometrical adiabatic phase factors,” Phys. Rev. A 59, 2910–2919 (1999).
    [CrossRef]
  12. H. Theuer, R. G. Unanyan, C. Habscheid, K. Klein, and K. Bergmann, “Novel laser controlled variable matter wave beamsplitter,” Opt. Express 4, 77–83 (1999).
    [CrossRef] [PubMed]
  13. H. Goto and K. Ichimura, “Observation of coherent population transfer in a four-level tripod system with a rare-earth-metal-ion-doped crystal,” Phys. Rev. A 75, 033404 (2007).
    [CrossRef]
  14. M. Saffman and T. G. Walker, “Quantum information with Rydberg atoms,” Rev. Mod. Phys. 82, 2313–2363 (2010).
    [CrossRef]
  15. N. Sangouard, L. P. Yatsenko, B. W. Shore, and T. Halfmann, “Preparation of nondegenerate coherent superpositions in a three-state ladder system assisted by Stark shifts,” Phys. Rev. A 73, 043415 (2006).
    [CrossRef]
  16. H. A. Camp, M. H. Shah, M. L. Trachy, O. L. Weaver, and B. D. DePaola, “Numerical exploration of coherent excitation in three-level systems,” Phys. Rev. A 71, 053401 (2005).
    [CrossRef]
  17. R. G. Fernandez, A. Ekers, L. P. Yatsenko, N. V. Vitanov, and K. Bergmann, “Control of population flow in coherently driven quantum ladders,” Phys. Rev. Lett. 95, 043001 (2005).
    [CrossRef]
  18. H. Schempp, G. Gunter, C. S. Hofmann, C. Giese, S. D. Saliba, B. D. DePaola, T. Amthor, and M. Weidemuller, “Coherent population trapping with controlled interparticle interactions,” Phys. Rev. Lett. 104, 173602 (2010).
    [CrossRef] [PubMed]

2010 (2)

M. Saffman and T. G. Walker, “Quantum information with Rydberg atoms,” Rev. Mod. Phys. 82, 2313–2363 (2010).
[CrossRef]

H. Schempp, G. Gunter, C. S. Hofmann, C. Giese, S. D. Saliba, B. D. DePaola, T. Amthor, and M. Weidemuller, “Coherent population trapping with controlled interparticle interactions,” Phys. Rev. Lett. 104, 173602 (2010).
[CrossRef] [PubMed]

2007 (1)

H. Goto and K. Ichimura, “Observation of coherent population transfer in a four-level tripod system with a rare-earth-metal-ion-doped crystal,” Phys. Rev. A 75, 033404 (2007).
[CrossRef]

2006 (1)

N. Sangouard, L. P. Yatsenko, B. W. Shore, and T. Halfmann, “Preparation of nondegenerate coherent superpositions in a three-state ladder system assisted by Stark shifts,” Phys. Rev. A 73, 043415 (2006).
[CrossRef]

2005 (2)

H. A. Camp, M. H. Shah, M. L. Trachy, O. L. Weaver, and B. D. DePaola, “Numerical exploration of coherent excitation in three-level systems,” Phys. Rev. A 71, 053401 (2005).
[CrossRef]

R. G. Fernandez, A. Ekers, L. P. Yatsenko, N. V. Vitanov, and K. Bergmann, “Control of population flow in coherently driven quantum ladders,” Phys. Rev. Lett. 95, 043001 (2005).
[CrossRef]

2004 (2)

V. A. Sautenkov, C.-Y. Ye, Y. V. Rostovtsev, G. R. Welch, and M. O. Scully, “Enhancement of field generation via maximal atomic coherence prepared by fast adiabatic passage in Rb vapor,” Phys. Rev. A 70, 033406 (2004).
[CrossRef]

Y.-P. Niu, S.-Q. Gong, R.-X. Li, and S.-Q. Jin, “Creation of atomic coherent superposition states via the technique of stimulated Raman adiabatic passage using a Λ-type system with a manifold of levels,” Phys. Rev. A 70, 023805 (2004).
[CrossRef]

2003 (1)

F. Vewinger, M. Heinz, R. G. Fernandez, N. V. Vitanov, and K. Bergmann, “Creation and measurement of a coherent superposition of quantun states,” Phys. Rev. Lett. 91, 213001 (2003).
[CrossRef] [PubMed]

1999 (2)

R. G. Unanyan, B. W. Shore, and K. Bergmann, “Laser-driven population transfer in four-level atoms: consequences of non-Abelian geometrical adiabatic phase factors,” Phys. Rev. A 59, 2910–2919 (1999).
[CrossRef]

H. Theuer, R. G. Unanyan, C. Habscheid, K. Klein, and K. Bergmann, “Novel laser controlled variable matter wave beamsplitter,” Opt. Express 4, 77–83 (1999).
[CrossRef] [PubMed]

1998 (2)

K. Bergmann, H. Theuer, and B. W. Shore, “Coherent population transfer among quantum states of atoms and molecules,” Rev. Mod. Phys. 70, 1003–1025 (1998).
[CrossRef]

R. G. Unanyan, M. Fleischhauer, B. W. Shore, and K. Bergmann, “Robust creation and phase-sensitive probing of superposition states via stimulated Raman adiabatic passage (STIRAP) with degenerate dark states,” Opt. Commun. 155, 144–154 (1998).
[CrossRef]

1996 (1)

S.-Y. Zhu and M. O. Scully, “Spectral line elimination and spontaneous emission cancellation via quantum interference,” Phys. Rev. Lett. 76, 388–391 (1996).
[CrossRef] [PubMed]

1992 (1)

J.-Y. Gao, C. Guo, X.-Z. Guo, G.-X. Jin, Q.-W. Wang, J. Zhao, H.-Z. Zhang, Y. Jiang, D.-Z. Wang, and D.-M. Jiang, “Observation of light amplification without population inversion in sodium,” Opt. Commun. 93, 323–327 (1992).
[CrossRef]

1991 (2)

D. J. Gauthier, Y.-F. Zhu, and T. W. Mossberg, “Observation of linewidth narrowing due to coherent stabilization of quantum fluctuations,” Phys. Rev. Lett. 66, 2460–2463 (1991).
[CrossRef] [PubMed]

K. J. Boller, A. Imamoğlu, and S. E. Harris, “Observation of electromagnetically induced transparency,” Phys. Rev. Lett. 66, 2593–2596 (1991).
[CrossRef] [PubMed]

1978 (1)

Amthor, T.

H. Schempp, G. Gunter, C. S. Hofmann, C. Giese, S. D. Saliba, B. D. DePaola, T. Amthor, and M. Weidemuller, “Coherent population trapping with controlled interparticle interactions,” Phys. Rev. Lett. 104, 173602 (2010).
[CrossRef] [PubMed]

Bergmann, K.

R. G. Fernandez, A. Ekers, L. P. Yatsenko, N. V. Vitanov, and K. Bergmann, “Control of population flow in coherently driven quantum ladders,” Phys. Rev. Lett. 95, 043001 (2005).
[CrossRef]

F. Vewinger, M. Heinz, R. G. Fernandez, N. V. Vitanov, and K. Bergmann, “Creation and measurement of a coherent superposition of quantun states,” Phys. Rev. Lett. 91, 213001 (2003).
[CrossRef] [PubMed]

R. G. Unanyan, B. W. Shore, and K. Bergmann, “Laser-driven population transfer in four-level atoms: consequences of non-Abelian geometrical adiabatic phase factors,” Phys. Rev. A 59, 2910–2919 (1999).
[CrossRef]

H. Theuer, R. G. Unanyan, C. Habscheid, K. Klein, and K. Bergmann, “Novel laser controlled variable matter wave beamsplitter,” Opt. Express 4, 77–83 (1999).
[CrossRef] [PubMed]

R. G. Unanyan, M. Fleischhauer, B. W. Shore, and K. Bergmann, “Robust creation and phase-sensitive probing of superposition states via stimulated Raman adiabatic passage (STIRAP) with degenerate dark states,” Opt. Commun. 155, 144–154 (1998).
[CrossRef]

K. Bergmann, H. Theuer, and B. W. Shore, “Coherent population transfer among quantum states of atoms and molecules,” Rev. Mod. Phys. 70, 1003–1025 (1998).
[CrossRef]

Boller, K. J.

K. J. Boller, A. Imamoğlu, and S. E. Harris, “Observation of electromagnetically induced transparency,” Phys. Rev. Lett. 66, 2593–2596 (1991).
[CrossRef] [PubMed]

Camp, H. A.

H. A. Camp, M. H. Shah, M. L. Trachy, O. L. Weaver, and B. D. DePaola, “Numerical exploration of coherent excitation in three-level systems,” Phys. Rev. A 71, 053401 (2005).
[CrossRef]

DePaola, B. D.

H. Schempp, G. Gunter, C. S. Hofmann, C. Giese, S. D. Saliba, B. D. DePaola, T. Amthor, and M. Weidemuller, “Coherent population trapping with controlled interparticle interactions,” Phys. Rev. Lett. 104, 173602 (2010).
[CrossRef] [PubMed]

H. A. Camp, M. H. Shah, M. L. Trachy, O. L. Weaver, and B. D. DePaola, “Numerical exploration of coherent excitation in three-level systems,” Phys. Rev. A 71, 053401 (2005).
[CrossRef]

Ekers, A.

R. G. Fernandez, A. Ekers, L. P. Yatsenko, N. V. Vitanov, and K. Bergmann, “Control of population flow in coherently driven quantum ladders,” Phys. Rev. Lett. 95, 043001 (2005).
[CrossRef]

Fernandez, R. G.

R. G. Fernandez, A. Ekers, L. P. Yatsenko, N. V. Vitanov, and K. Bergmann, “Control of population flow in coherently driven quantum ladders,” Phys. Rev. Lett. 95, 043001 (2005).
[CrossRef]

F. Vewinger, M. Heinz, R. G. Fernandez, N. V. Vitanov, and K. Bergmann, “Creation and measurement of a coherent superposition of quantun states,” Phys. Rev. Lett. 91, 213001 (2003).
[CrossRef] [PubMed]

Fleischhauer, M.

R. G. Unanyan, M. Fleischhauer, B. W. Shore, and K. Bergmann, “Robust creation and phase-sensitive probing of superposition states via stimulated Raman adiabatic passage (STIRAP) with degenerate dark states,” Opt. Commun. 155, 144–154 (1998).
[CrossRef]

Gao, J.-Y.

J.-Y. Gao, C. Guo, X.-Z. Guo, G.-X. Jin, Q.-W. Wang, J. Zhao, H.-Z. Zhang, Y. Jiang, D.-Z. Wang, and D.-M. Jiang, “Observation of light amplification without population inversion in sodium,” Opt. Commun. 93, 323–327 (1992).
[CrossRef]

Gauthier, D. J.

D. J. Gauthier, Y.-F. Zhu, and T. W. Mossberg, “Observation of linewidth narrowing due to coherent stabilization of quantum fluctuations,” Phys. Rev. Lett. 66, 2460–2463 (1991).
[CrossRef] [PubMed]

Giese, C.

H. Schempp, G. Gunter, C. S. Hofmann, C. Giese, S. D. Saliba, B. D. DePaola, T. Amthor, and M. Weidemuller, “Coherent population trapping with controlled interparticle interactions,” Phys. Rev. Lett. 104, 173602 (2010).
[CrossRef] [PubMed]

Gong, S.-Q.

Y.-P. Niu, S.-Q. Gong, R.-X. Li, and S.-Q. Jin, “Creation of atomic coherent superposition states via the technique of stimulated Raman adiabatic passage using a Λ-type system with a manifold of levels,” Phys. Rev. A 70, 023805 (2004).
[CrossRef]

Goto, H.

H. Goto and K. Ichimura, “Observation of coherent population transfer in a four-level tripod system with a rare-earth-metal-ion-doped crystal,” Phys. Rev. A 75, 033404 (2007).
[CrossRef]

Gray, H. R.

Gunter, G.

H. Schempp, G. Gunter, C. S. Hofmann, C. Giese, S. D. Saliba, B. D. DePaola, T. Amthor, and M. Weidemuller, “Coherent population trapping with controlled interparticle interactions,” Phys. Rev. Lett. 104, 173602 (2010).
[CrossRef] [PubMed]

Guo, C.

J.-Y. Gao, C. Guo, X.-Z. Guo, G.-X. Jin, Q.-W. Wang, J. Zhao, H.-Z. Zhang, Y. Jiang, D.-Z. Wang, and D.-M. Jiang, “Observation of light amplification without population inversion in sodium,” Opt. Commun. 93, 323–327 (1992).
[CrossRef]

Guo, X.-Z.

J.-Y. Gao, C. Guo, X.-Z. Guo, G.-X. Jin, Q.-W. Wang, J. Zhao, H.-Z. Zhang, Y. Jiang, D.-Z. Wang, and D.-M. Jiang, “Observation of light amplification without population inversion in sodium,” Opt. Commun. 93, 323–327 (1992).
[CrossRef]

Habscheid, C.

Halfmann, T.

N. Sangouard, L. P. Yatsenko, B. W. Shore, and T. Halfmann, “Preparation of nondegenerate coherent superpositions in a three-state ladder system assisted by Stark shifts,” Phys. Rev. A 73, 043415 (2006).
[CrossRef]

Harris, S. E.

K. J. Boller, A. Imamoğlu, and S. E. Harris, “Observation of electromagnetically induced transparency,” Phys. Rev. Lett. 66, 2593–2596 (1991).
[CrossRef] [PubMed]

Heinz, M.

F. Vewinger, M. Heinz, R. G. Fernandez, N. V. Vitanov, and K. Bergmann, “Creation and measurement of a coherent superposition of quantun states,” Phys. Rev. Lett. 91, 213001 (2003).
[CrossRef] [PubMed]

Hofmann, C. S.

H. Schempp, G. Gunter, C. S. Hofmann, C. Giese, S. D. Saliba, B. D. DePaola, T. Amthor, and M. Weidemuller, “Coherent population trapping with controlled interparticle interactions,” Phys. Rev. Lett. 104, 173602 (2010).
[CrossRef] [PubMed]

Ichimura, K.

H. Goto and K. Ichimura, “Observation of coherent population transfer in a four-level tripod system with a rare-earth-metal-ion-doped crystal,” Phys. Rev. A 75, 033404 (2007).
[CrossRef]

Imamoglu, A.

K. J. Boller, A. Imamoğlu, and S. E. Harris, “Observation of electromagnetically induced transparency,” Phys. Rev. Lett. 66, 2593–2596 (1991).
[CrossRef] [PubMed]

Jiang, D.-M.

J.-Y. Gao, C. Guo, X.-Z. Guo, G.-X. Jin, Q.-W. Wang, J. Zhao, H.-Z. Zhang, Y. Jiang, D.-Z. Wang, and D.-M. Jiang, “Observation of light amplification without population inversion in sodium,” Opt. Commun. 93, 323–327 (1992).
[CrossRef]

Jiang, Y.

J.-Y. Gao, C. Guo, X.-Z. Guo, G.-X. Jin, Q.-W. Wang, J. Zhao, H.-Z. Zhang, Y. Jiang, D.-Z. Wang, and D.-M. Jiang, “Observation of light amplification without population inversion in sodium,” Opt. Commun. 93, 323–327 (1992).
[CrossRef]

Jin, G.-X.

J.-Y. Gao, C. Guo, X.-Z. Guo, G.-X. Jin, Q.-W. Wang, J. Zhao, H.-Z. Zhang, Y. Jiang, D.-Z. Wang, and D.-M. Jiang, “Observation of light amplification without population inversion in sodium,” Opt. Commun. 93, 323–327 (1992).
[CrossRef]

Jin, S.-Q.

Y.-P. Niu, S.-Q. Gong, R.-X. Li, and S.-Q. Jin, “Creation of atomic coherent superposition states via the technique of stimulated Raman adiabatic passage using a Λ-type system with a manifold of levels,” Phys. Rev. A 70, 023805 (2004).
[CrossRef]

Klein, K.

Li, R.-X.

Y.-P. Niu, S.-Q. Gong, R.-X. Li, and S.-Q. Jin, “Creation of atomic coherent superposition states via the technique of stimulated Raman adiabatic passage using a Λ-type system with a manifold of levels,” Phys. Rev. A 70, 023805 (2004).
[CrossRef]

Mossberg, T. W.

D. J. Gauthier, Y.-F. Zhu, and T. W. Mossberg, “Observation of linewidth narrowing due to coherent stabilization of quantum fluctuations,” Phys. Rev. Lett. 66, 2460–2463 (1991).
[CrossRef] [PubMed]

Niu, Y.-P.

Y.-P. Niu, S.-Q. Gong, R.-X. Li, and S.-Q. Jin, “Creation of atomic coherent superposition states via the technique of stimulated Raman adiabatic passage using a Λ-type system with a manifold of levels,” Phys. Rev. A 70, 023805 (2004).
[CrossRef]

Rostovtsev, Y. V.

V. A. Sautenkov, C.-Y. Ye, Y. V. Rostovtsev, G. R. Welch, and M. O. Scully, “Enhancement of field generation via maximal atomic coherence prepared by fast adiabatic passage in Rb vapor,” Phys. Rev. A 70, 033406 (2004).
[CrossRef]

Saffman, M.

M. Saffman and T. G. Walker, “Quantum information with Rydberg atoms,” Rev. Mod. Phys. 82, 2313–2363 (2010).
[CrossRef]

Saliba, S. D.

H. Schempp, G. Gunter, C. S. Hofmann, C. Giese, S. D. Saliba, B. D. DePaola, T. Amthor, and M. Weidemuller, “Coherent population trapping with controlled interparticle interactions,” Phys. Rev. Lett. 104, 173602 (2010).
[CrossRef] [PubMed]

Sangouard, N.

N. Sangouard, L. P. Yatsenko, B. W. Shore, and T. Halfmann, “Preparation of nondegenerate coherent superpositions in a three-state ladder system assisted by Stark shifts,” Phys. Rev. A 73, 043415 (2006).
[CrossRef]

Sautenkov, V. A.

V. A. Sautenkov, C.-Y. Ye, Y. V. Rostovtsev, G. R. Welch, and M. O. Scully, “Enhancement of field generation via maximal atomic coherence prepared by fast adiabatic passage in Rb vapor,” Phys. Rev. A 70, 033406 (2004).
[CrossRef]

Schempp, H.

H. Schempp, G. Gunter, C. S. Hofmann, C. Giese, S. D. Saliba, B. D. DePaola, T. Amthor, and M. Weidemuller, “Coherent population trapping with controlled interparticle interactions,” Phys. Rev. Lett. 104, 173602 (2010).
[CrossRef] [PubMed]

Scully, M. O.

V. A. Sautenkov, C.-Y. Ye, Y. V. Rostovtsev, G. R. Welch, and M. O. Scully, “Enhancement of field generation via maximal atomic coherence prepared by fast adiabatic passage in Rb vapor,” Phys. Rev. A 70, 033406 (2004).
[CrossRef]

S.-Y. Zhu and M. O. Scully, “Spectral line elimination and spontaneous emission cancellation via quantum interference,” Phys. Rev. Lett. 76, 388–391 (1996).
[CrossRef] [PubMed]

Shah, M. H.

H. A. Camp, M. H. Shah, M. L. Trachy, O. L. Weaver, and B. D. DePaola, “Numerical exploration of coherent excitation in three-level systems,” Phys. Rev. A 71, 053401 (2005).
[CrossRef]

Shore, B. W.

N. Sangouard, L. P. Yatsenko, B. W. Shore, and T. Halfmann, “Preparation of nondegenerate coherent superpositions in a three-state ladder system assisted by Stark shifts,” Phys. Rev. A 73, 043415 (2006).
[CrossRef]

R. G. Unanyan, B. W. Shore, and K. Bergmann, “Laser-driven population transfer in four-level atoms: consequences of non-Abelian geometrical adiabatic phase factors,” Phys. Rev. A 59, 2910–2919 (1999).
[CrossRef]

R. G. Unanyan, M. Fleischhauer, B. W. Shore, and K. Bergmann, “Robust creation and phase-sensitive probing of superposition states via stimulated Raman adiabatic passage (STIRAP) with degenerate dark states,” Opt. Commun. 155, 144–154 (1998).
[CrossRef]

K. Bergmann, H. Theuer, and B. W. Shore, “Coherent population transfer among quantum states of atoms and molecules,” Rev. Mod. Phys. 70, 1003–1025 (1998).
[CrossRef]

Stroud, C. R.

Theuer, H.

H. Theuer, R. G. Unanyan, C. Habscheid, K. Klein, and K. Bergmann, “Novel laser controlled variable matter wave beamsplitter,” Opt. Express 4, 77–83 (1999).
[CrossRef] [PubMed]

K. Bergmann, H. Theuer, and B. W. Shore, “Coherent population transfer among quantum states of atoms and molecules,” Rev. Mod. Phys. 70, 1003–1025 (1998).
[CrossRef]

Trachy, M. L.

H. A. Camp, M. H. Shah, M. L. Trachy, O. L. Weaver, and B. D. DePaola, “Numerical exploration of coherent excitation in three-level systems,” Phys. Rev. A 71, 053401 (2005).
[CrossRef]

Unanyan, R. G.

R. G. Unanyan, B. W. Shore, and K. Bergmann, “Laser-driven population transfer in four-level atoms: consequences of non-Abelian geometrical adiabatic phase factors,” Phys. Rev. A 59, 2910–2919 (1999).
[CrossRef]

H. Theuer, R. G. Unanyan, C. Habscheid, K. Klein, and K. Bergmann, “Novel laser controlled variable matter wave beamsplitter,” Opt. Express 4, 77–83 (1999).
[CrossRef] [PubMed]

R. G. Unanyan, M. Fleischhauer, B. W. Shore, and K. Bergmann, “Robust creation and phase-sensitive probing of superposition states via stimulated Raman adiabatic passage (STIRAP) with degenerate dark states,” Opt. Commun. 155, 144–154 (1998).
[CrossRef]

Vewinger, F.

F. Vewinger, M. Heinz, R. G. Fernandez, N. V. Vitanov, and K. Bergmann, “Creation and measurement of a coherent superposition of quantun states,” Phys. Rev. Lett. 91, 213001 (2003).
[CrossRef] [PubMed]

Vitanov, N. V.

R. G. Fernandez, A. Ekers, L. P. Yatsenko, N. V. Vitanov, and K. Bergmann, “Control of population flow in coherently driven quantum ladders,” Phys. Rev. Lett. 95, 043001 (2005).
[CrossRef]

F. Vewinger, M. Heinz, R. G. Fernandez, N. V. Vitanov, and K. Bergmann, “Creation and measurement of a coherent superposition of quantun states,” Phys. Rev. Lett. 91, 213001 (2003).
[CrossRef] [PubMed]

Walker, T. G.

M. Saffman and T. G. Walker, “Quantum information with Rydberg atoms,” Rev. Mod. Phys. 82, 2313–2363 (2010).
[CrossRef]

Wang, D.-Z.

J.-Y. Gao, C. Guo, X.-Z. Guo, G.-X. Jin, Q.-W. Wang, J. Zhao, H.-Z. Zhang, Y. Jiang, D.-Z. Wang, and D.-M. Jiang, “Observation of light amplification without population inversion in sodium,” Opt. Commun. 93, 323–327 (1992).
[CrossRef]

Wang, Q.-W.

J.-Y. Gao, C. Guo, X.-Z. Guo, G.-X. Jin, Q.-W. Wang, J. Zhao, H.-Z. Zhang, Y. Jiang, D.-Z. Wang, and D.-M. Jiang, “Observation of light amplification without population inversion in sodium,” Opt. Commun. 93, 323–327 (1992).
[CrossRef]

Weaver, O. L.

H. A. Camp, M. H. Shah, M. L. Trachy, O. L. Weaver, and B. D. DePaola, “Numerical exploration of coherent excitation in three-level systems,” Phys. Rev. A 71, 053401 (2005).
[CrossRef]

Weidemuller, M.

H. Schempp, G. Gunter, C. S. Hofmann, C. Giese, S. D. Saliba, B. D. DePaola, T. Amthor, and M. Weidemuller, “Coherent population trapping with controlled interparticle interactions,” Phys. Rev. Lett. 104, 173602 (2010).
[CrossRef] [PubMed]

Welch, G. R.

V. A. Sautenkov, C.-Y. Ye, Y. V. Rostovtsev, G. R. Welch, and M. O. Scully, “Enhancement of field generation via maximal atomic coherence prepared by fast adiabatic passage in Rb vapor,” Phys. Rev. A 70, 033406 (2004).
[CrossRef]

Whitley, R. M.

Yatsenko, L. P.

N. Sangouard, L. P. Yatsenko, B. W. Shore, and T. Halfmann, “Preparation of nondegenerate coherent superpositions in a three-state ladder system assisted by Stark shifts,” Phys. Rev. A 73, 043415 (2006).
[CrossRef]

R. G. Fernandez, A. Ekers, L. P. Yatsenko, N. V. Vitanov, and K. Bergmann, “Control of population flow in coherently driven quantum ladders,” Phys. Rev. Lett. 95, 043001 (2005).
[CrossRef]

Ye, C.-Y.

V. A. Sautenkov, C.-Y. Ye, Y. V. Rostovtsev, G. R. Welch, and M. O. Scully, “Enhancement of field generation via maximal atomic coherence prepared by fast adiabatic passage in Rb vapor,” Phys. Rev. A 70, 033406 (2004).
[CrossRef]

Zhang, H.-Z.

J.-Y. Gao, C. Guo, X.-Z. Guo, G.-X. Jin, Q.-W. Wang, J. Zhao, H.-Z. Zhang, Y. Jiang, D.-Z. Wang, and D.-M. Jiang, “Observation of light amplification without population inversion in sodium,” Opt. Commun. 93, 323–327 (1992).
[CrossRef]

Zhao, J.

J.-Y. Gao, C. Guo, X.-Z. Guo, G.-X. Jin, Q.-W. Wang, J. Zhao, H.-Z. Zhang, Y. Jiang, D.-Z. Wang, and D.-M. Jiang, “Observation of light amplification without population inversion in sodium,” Opt. Commun. 93, 323–327 (1992).
[CrossRef]

Zhu, S.-Y.

S.-Y. Zhu and M. O. Scully, “Spectral line elimination and spontaneous emission cancellation via quantum interference,” Phys. Rev. Lett. 76, 388–391 (1996).
[CrossRef] [PubMed]

Zhu, Y.-F.

D. J. Gauthier, Y.-F. Zhu, and T. W. Mossberg, “Observation of linewidth narrowing due to coherent stabilization of quantum fluctuations,” Phys. Rev. Lett. 66, 2460–2463 (1991).
[CrossRef] [PubMed]

Opt. Commun. (2)

J.-Y. Gao, C. Guo, X.-Z. Guo, G.-X. Jin, Q.-W. Wang, J. Zhao, H.-Z. Zhang, Y. Jiang, D.-Z. Wang, and D.-M. Jiang, “Observation of light amplification without population inversion in sodium,” Opt. Commun. 93, 323–327 (1992).
[CrossRef]

R. G. Unanyan, M. Fleischhauer, B. W. Shore, and K. Bergmann, “Robust creation and phase-sensitive probing of superposition states via stimulated Raman adiabatic passage (STIRAP) with degenerate dark states,” Opt. Commun. 155, 144–154 (1998).
[CrossRef]

Opt. Express (1)

Opt. Lett. (1)

Phys. Rev. A (6)

V. A. Sautenkov, C.-Y. Ye, Y. V. Rostovtsev, G. R. Welch, and M. O. Scully, “Enhancement of field generation via maximal atomic coherence prepared by fast adiabatic passage in Rb vapor,” Phys. Rev. A 70, 033406 (2004).
[CrossRef]

Y.-P. Niu, S.-Q. Gong, R.-X. Li, and S.-Q. Jin, “Creation of atomic coherent superposition states via the technique of stimulated Raman adiabatic passage using a Λ-type system with a manifold of levels,” Phys. Rev. A 70, 023805 (2004).
[CrossRef]

H. Goto and K. Ichimura, “Observation of coherent population transfer in a four-level tripod system with a rare-earth-metal-ion-doped crystal,” Phys. Rev. A 75, 033404 (2007).
[CrossRef]

R. G. Unanyan, B. W. Shore, and K. Bergmann, “Laser-driven population transfer in four-level atoms: consequences of non-Abelian geometrical adiabatic phase factors,” Phys. Rev. A 59, 2910–2919 (1999).
[CrossRef]

N. Sangouard, L. P. Yatsenko, B. W. Shore, and T. Halfmann, “Preparation of nondegenerate coherent superpositions in a three-state ladder system assisted by Stark shifts,” Phys. Rev. A 73, 043415 (2006).
[CrossRef]

H. A. Camp, M. H. Shah, M. L. Trachy, O. L. Weaver, and B. D. DePaola, “Numerical exploration of coherent excitation in three-level systems,” Phys. Rev. A 71, 053401 (2005).
[CrossRef]

Phys. Rev. Lett. (6)

R. G. Fernandez, A. Ekers, L. P. Yatsenko, N. V. Vitanov, and K. Bergmann, “Control of population flow in coherently driven quantum ladders,” Phys. Rev. Lett. 95, 043001 (2005).
[CrossRef]

H. Schempp, G. Gunter, C. S. Hofmann, C. Giese, S. D. Saliba, B. D. DePaola, T. Amthor, and M. Weidemuller, “Coherent population trapping with controlled interparticle interactions,” Phys. Rev. Lett. 104, 173602 (2010).
[CrossRef] [PubMed]

F. Vewinger, M. Heinz, R. G. Fernandez, N. V. Vitanov, and K. Bergmann, “Creation and measurement of a coherent superposition of quantun states,” Phys. Rev. Lett. 91, 213001 (2003).
[CrossRef] [PubMed]

K. J. Boller, A. Imamoğlu, and S. E. Harris, “Observation of electromagnetically induced transparency,” Phys. Rev. Lett. 66, 2593–2596 (1991).
[CrossRef] [PubMed]

S.-Y. Zhu and M. O. Scully, “Spectral line elimination and spontaneous emission cancellation via quantum interference,” Phys. Rev. Lett. 76, 388–391 (1996).
[CrossRef] [PubMed]

D. J. Gauthier, Y.-F. Zhu, and T. W. Mossberg, “Observation of linewidth narrowing due to coherent stabilization of quantum fluctuations,” Phys. Rev. Lett. 66, 2460–2463 (1991).
[CrossRef] [PubMed]

Rev. Mod. Phys. (2)

K. Bergmann, H. Theuer, and B. W. Shore, “Coherent population transfer among quantum states of atoms and molecules,” Rev. Mod. Phys. 70, 1003–1025 (1998).
[CrossRef]

M. Saffman and T. G. Walker, “Quantum information with Rydberg atoms,” Rev. Mod. Phys. 82, 2313–2363 (2010).
[CrossRef]

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Figures (5)

Fig. 1
Fig. 1

Energy-level diagram of a four-level ladder-type atomic system with Ω p , Ω s , and Ω π being, respectively, Rabi frequencies of the applied pump, Stokes, and π pulses.

Fig. 2
Fig. 2

(Color online) (a) Time sequence of the Stokes, pump, and π pulses. The pump and π pulses are delayed from the Stokes pulse by τp and τπ , respectively. (b) Time evolution of atomic populations ρ 11, ρ 33, and ρ 44. Dashed curves are plotted for an ideal four-level ladder system with Γ32 = Γ41 = Γ43 = 0; solid curves are plotted for a realistic four-level ladder system with Γ32 = 200 kHz, Γ41 = 10 kHz, and Γ43 = 50 kHz. Other parameters are set as Δ2 = Δ3 = 0, Γ21 = 38 MHz, Ω p 0 = Ω s 0 = 400 MHz, Ω π 0 = 40 MHz, Ts = Tp = 80 ns, Tπ = 22.15 ns, τp = 94 ns, and τπ = 77 ns.

Fig. 3
Fig. 3

(Color online) Atomic population ρ 44 as a function of the delay time τπ . for an ideal four-level ladder system in (a); for a realistic four-level ladder system in (b). Dashed, solid, and dash-dotted curves correspond to Ω π 0 = 4 MHz, 40 MHz, and 400 MHz, respectively. Other parameters are the same as in Fig. 2.

Fig. 4
Fig. 4

(Color online) (a) Time sequence of the Stokes, pump, and π pulses. The pump and Stokes pulses have the same falling edge while the π pulse is delayed from the pump pulse by τπ . (b) Time evolution of atomic population and coherence ρ 11, ρ 33, ρ 44, and ρ 14 for an ideal four-level ladder system with Γ32 = Γ41 = Γ43 = 0. Other parameters are set as Δ2 = Δ3 = 0, Γ21 = 38 MHz, Ω p 0 = Ω s 0 = 400 MHz, Ω π 0 = 40 MHz, Ts = Tp = 80 ns, Tπ = 22.15 ns, τp = 0, and τπ = 125 ns.

Fig. 5
Fig. 5

(Color online) Atomic coherence ρ 14 as a function of the delay time τπ for an ideal four-level ladder system in (a); for a realistic four-level ladder system in (b). Dashed, solid, and dash-dotted curves correspond to Ω π 0 = 4 MHz, 40 MHz, and 400 MHz, respectively. Other parameters are the same as in Fig. 4.

Equations (6)

Equations on this page are rendered with MathJax. Learn more.

A ( t ) = Ω π 0 e ( t τ π ) 2 T π 2 dt = π ,
Ω π 0 T π = π
H I = ( 0 Ω s ( t ) 0 0 Ω s * ( t ) Δ 2 Ω p ( t ) 0 0 Ω p * ( t ) Δ 2 + Δ 3 Ω π ( t ) 0 0 Ω π * ( t ) Δ 2 + Δ 3 )
i h ¯ ρ t = [ H I , ρ ] 1 2 i h ¯ [ Γ , ρ ]
ρ ˙ 11 = i Ω p ρ 12 + i Ω p * ρ 21 + Γ 21 ρ 22 + Γ 41 ρ 44 , ρ ˙ 22 = i Ω p ρ 12 i Ω p * ρ 21 i Ω s ρ 23 + i Ω s * ρ 32 Γ 21 ρ 22 + Γ 32 ρ 33 , ρ ˙ 33 = i Ω s ρ 23 i Ω s * ρ 32 i Ω π ρ 34 + i Ω π * ρ 43 Γ 32 ρ 33 + Γ 43 ρ 44 , ρ ˙ 44 = i Ω π ρ 34 i Ω π * ρ 43 ( Γ 41 + Γ 43 ) ρ 44 , ρ ˙ 12 = i Ω p * ( ρ 11 ρ 22 ) i Ω s ρ 13 + i Δ 2 ρ 12 γ 21 ρ 12 , ρ ˙ 13 = i Ω p * ρ 23 i Ω s * ρ 12 i Ω π ρ 14 + i ( Δ 2 + Δ 3 ) ρ 13 γ 31 ρ 13 , ρ ˙ 14 = i Ω p * ρ 24 i Ω π * ρ 13 + i ( Δ 2 + Δ 3 ) ρ 14 γ 41 ρ 14 , ρ ˙ 23 = i Ω p ρ 13 + i Ω s * ( ρ 33 ρ 22 ) i Ω π ρ 24 + i Δ 2 ρ 23 γ 32 ρ 23 .
Ω p z + 1 c Ω p t = i κ 12 ρ 21 , Ω s z + 1 c Ω s t = i κ 23 ρ 32 , Ω π z + 1 c Ω π t = i κ 34 ρ 43 .

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