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Physical Review A

Publisher's Note: Integrable optical-fiber source of polarization-entangled photon pairs in the telecom band [Phys. Rev.73, 052301 (2006)]

Xiaoying Li, Chuang Liang, Kim Fook Lee, Jun Chen, Paul L. Voss, Prem Kumar

Published May 17, 2006• 2 citations
Publisher

Abstract

This paper was published online on 3 May 2006 with several typographical errors. On page 3, the seventh line in the caption of Fig. There are two errors on page 5: in the left-hand column, the tenth line in the second paragraph should read as ''0.4 nm by the super-Gaussian-shaped... ;'' in the right-hand column, the third line should read as ''... about 0.07 pairs/pulse 19.'' On page 6, Ref. 19, the fifth line should read as ''idler channel... ;'' the ninth line should read as ''strengths of the RS... .

DOI
10.1103/physreva.73.059906

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This paper was published online on 3 May 2006 with several typographical errors. On page 3, the seventh line in the caption of Fig. There are two errors on page 5: in the left-hand column, the tenth line in the second paragraph should read as ''0.4 nm by the super-Gaussian-shaped... ;'' in the right-hand column, the third line should read as ''... about 0.07 pairs/pulse 19.'' On page 6, Ref. 19, the fifth line should read as ''idler channel... ;'' the ninth line should read as ''strengths of the RS... .
We demonstrate an optical-fiber-based source of polarization-entangled photon pairs with improved quality and efficiency, which has been integrated with off-the-shelf telecom components and is, therefore, well suited for quantum communication applications in the 1550-nm telecom band. Polarization entanglement is produced by simultaneously pumping a loop of standard dispersion-shifted fiber with two orthogonally polarized pump pulses, one propagating in the clockwise and the other in the counterclockwise direction. We characterize this source by investigating two-photon interference between the generated signal-idler photon pairs under various conditions. The experimental parameters are carefully optimized to maximize the generated photon-pair correlation and to minimize contamination of the entangled photon pairs from extraneously scattered background photons that are produced by the pump pulses for two reasons: (i) spontaneous Raman scattering causes uncorrelated photons to be emitted in the signal and idler bands and (ii) broadening of the pump-pulse spectrum due to self-phase modulation causes pump photons to leak into the signal and idler bands. We obtain two-photon interference with visibility >90>90%>90 without subtracting counts caused by the background photons (only dark counts of the detectors are subtracted), when the mean photon number in the signal (idler) channel is about 0.02/pulse, while no interference is observed in direct detection of either the signal or idler photons.
We present a fiber based source of entangled photon-pairs in the 1550 nm telecom band that can be integrated into the existing fiber network and is well suited for quantum information processing. With this source we have demonstrated the generation, storage, and long-distance distribution of polarization entanglement in standard optical fiber. We have also investigated the origin of the large number of accidental coincidences in the experiments, which has been proved to be Raman scattering, and discussed how to suppress the Raman scattering to improve the quality of the fiber source.
Studies on telecom-band entangled photon-pair sources for entanglement distribution have so far focused on their narrowband operations. Fiber-based sources are seriously limited by spontaneous Raman scattering while sources based on quasi-phase-matched crystals or waveguides are usually narrowband because of long device lengths and/or operations far from degeneracy. An entanglement distributor would have to multiplex many such narrowband sources before entanglement distribution to fully utilize the available fiber transmission bandwidth. In this work, we demonstrate a broadband source of polarization-entangled photon-pairs suitable for wavelength-multiplexed entanglement distribution over optical fiber. We show that our source is potentially capable of simultaneously supporting up to forty-four independent wavelength channels.
We present a fiber-based source of polarization-entangled photon pairs that is well suited for quantum communication applications in the 1.5μμμm band of standard telecommunication fiber. Quantum-correlated signal and idler photon pairs are produced when a nonlinear-fiber Sagnac interferometer is pumped in the anomalous-dispersion region of the fiber. Recently, we have demonstrated nonclassical properties of such photon pairs by using Geiger-mode InGaAs/InP avalanche photodiodes. Polarization entanglement in the photon pairs can be created by pumping the Sagnac interferometer with two orthogonally polarized pulses. In this case the parametrically scattered signal-idler photons yield biphoton interference with $>$90% visibility in coincidence detection, while no interference is observed in direct detection of either the signal or the idler photons.