Abstract

We demonstrate greatly improved results for the production of correlated photon-pairs using the four-photon scattering process in silica fiber. We achieve a true-coincidence-count to accidental-coincidence-count ratio greater than 10, when the photon-pair production rate is about 0.04/pulse. This represents a four-fold improvement over our previous results. The contribution of spontaneous Raman scattering, the primary cause of uncorrelated photons that degrades the fidelity of this source, is reduced by decreasing the wavelength detuning between the correlated photons and the pump photons and by using polarizers to remove the cross-polarized Raman-scattered photons. Excess Raman scattering could be further suppressed by cooling the silica fiber. Even without cooling the fiber, the achieved 10 to 1 ratio of true-coincidence to accidental-coincidence makes the fiber source of correlated photon-pairs a useful tool for realizing various quantum-communication protocols.

© 2004 Optical Society of America

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References

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J. Lightwave Technol. (1)

D. B. Mortimore, ???Fiber Loop Reflectors,??? J. Lightwave Technol. 6, 1217???1224 (1988)
[CrossRef]

J. Opt. B: Quantum Semiclass. Opt. (1)

P. L. Voss and P. Kumar, ???Raman-effect induced noise limits on ??(3) parametric amplifiers and wavelength converters,??? to appear in J. Opt. B: Quantum Semiclass. Opt. 6 (2004)

J. Phys. Chem. Solids (1)

M. Hass, ???Raman spectra of vitreous silica, germania, and sodium silicate glass,??? J. Phys. Chem. Solids 31, 415???422 (1970)
[CrossRef]

Nature (2)

D. Bouwmeester, J.-W. Pan, K. Mattle, M. Eibl, H. Weinfurter, and A. Zeilinger, ???Experimental quantum teleportation,??? Nature 390, 575???578 (1997)
[CrossRef]

I. Marcikic, H. de Riedmatten, W. Tittel, H. Zbinden, and N. Gisin, ???Long-distance teleportation of qubits at telecommunication wavelengths,??? Nature 421, 509???512 (2003)
[CrossRef] [PubMed]

Opt. Commun. (1)

F. A. Bovino, P. Varisco, A. M. Colla, G. Castagnoli, G. D. Giuseppe, and A. V. Sergienko, ???Effective fiber coupling of entangled photons for quantum communication,??? Opt. Commun. 227, 343???348 (2003)
[CrossRef]

Opt. Lett. (4)

Photon. Technol. Lett. (1)

M. Fiorentino, P. L. Voss, J. E. Sharping, and P. Kumar, ???All-fiber photon-pair source for quantum communication,??? Photon. Technol. Lett. 27, 491???493 (2002)

Phys. Rev. Lett. (1)

R. H. Stolen and M. A. Bosch, ???Low-Frequency and Low-Temperature Raman Scattering in Silica Fibers,??? Phys. Rev. Lett. 48, 805???808 (1982)
[CrossRef]

Rev. Mod. Phys. (1)

N. Gisin, G. Ribordy,W. Tittel, and H. Zbinden, ???Quamtum cryptography,??? Rev. Mod. Phys. 74, 145???195 (2001)
[CrossRef]

Other (1)

X. Li, P. L. Voss, J. E. Sharping, and P. Kumar, ???Optical-fiber source of polarization-enangled photon pairs in the 1550 nm telecom band,??? arXiv: quant-ph/0402191 (2004).

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Figures (5)

Fig. 1.
Fig. 1.

Experimental setup: scattered Stokes and anti-Stokes photons emerging from the port labelled “Out” are detected; FPC, fiber polarization controller; PBS, polarization beam splitter; G, gratting; QWP, quarter-wave plate; HWF, half-wave plate; “Signal-In” port is blocked during photon-counting measurement.

Fig. 2.
Fig. 2.

Measured coincidence rates as a function of the number of scattered photons per pump pulse (labelled Single Counts/Pulse) in the anti-Stokes channel for (a) scattered photons co-polarized with the pump and (b) scattered photons cross-polarized with the pump. In both cases λp =1536nm and Ω/2π=1.25THz; the diamonds represent the total-coincidence counts produced by a single pump pulse, the triangles represent the accidental-coincidence counts produced by two adjacent pump pulses, and the line represents the calculated coincidence counts for two independent light sources. The insets show the number of scattered photons per pump pulse detected in the anti-Stokes channel as a function of the number of photons in the pump pulse (hollow circles). A second-order polynomial, Na =s 1 Np +s 2 Np2, is shown to fit the experimental data (dot-dashed line). The contributions of linear scattering, s 1 Np , (dashed line) and quadratic scattering, s 2 Np2, (dotted line) are plotted separately as well. For the inset in (a): s 1=0.00436 and s 2=0.01046; for the inset in (b): s 1=0.00381 and s 2=0.00033.

Fig. 3.
Fig. 3.

Same as in Fig.2, except λp =1525nm. For the inset in (a): s 1=0.00688 and s 2=4.38×10-5; for the inset in (b): s 1=0.005 and s 2=0.

Fig. 4.
Fig. 4.

Optical transmission spectrum of the double-grating filter. The pump at 1536 nm is rejected by more than 75 dB compared to the peak transmissions in the Stokes and anti-Stokes channels.

Fig. 5.
Fig. 5.

Same as in Fig.2, except Ω/2π=0.5THz. For the inset in (a): s 1=0.00317 and s 2=0.0132; for the inset in (b): s 1=0.00259 and s 2=0.00025. In (a), taking into account the detection efficiency of 6% in the anti-Stokes channel, at a photon-pair production rate of 0.04 (0.067) per pulse the ratio between the total coincidence rate and the accidental coincidence rate is 13:1 (7.5:1).

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