2002/09/20 by Prem Kumar, P. Kumar, Kumar, P. +13
Computer Science · Physics and Astronomy · #FOS: Physical sciences #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum Physics (quant-ph) #quant-ph
paper · pdf · doi:10.48550/arxiv.quant-ph/0209112
6 pages, 4 figures; to appear in the Proceedings of QCMC'02: Quantum Communication, Measurement, and Computing (QCMC'02), J. H. Shapiro and O. Hirota, Eds., (Rinton Press, New Jersey, 2002)
arxiv created 2002/09/20 · openalex publication_date 2002/09/20 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We present a fiber-based source of polarization-entangled photon pairs that is well suited for quantum communication applications in the 1.5μm 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.