Optical-Fiber Source of Polarization-Entangled Photons in the 1550 nm Telecom Band

Xiaoying Li, Paul L. Voss, Jay E. Sharping, and Prem Kumar
Phys. Rev. Lett. 94, 053601 – Published 9 February 2005

Abstract

We present a fiber-based source of polarization-entangled photons that is well suited for quantum communication applications in the 1550 nm band of standard fiber-optic telecommunications. Polarization entanglement is created by pumping a nonlinear-fiber Sagnac interferometer with two time-delayed orthogonally polarized pump pulses and subsequently removing the time distinguishability by passing the parametrically scattered signal and idler photon pairs through a piece of birefringent fiber. Coincidence detection of the signal and idler photons yields biphoton interference with visibility greater than 90%, while no interference is observed in direct detection of either signal or idler photons. All four Bell states can be prepared with our setup and we demonstrate violations of the Clauser-Horne-Shimony-Holt form of Bell’s inequality by up to 10 standard deviations of measurement uncertainty.

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  • Received 12 August 2004

DOI:https://doi.org/10.1103/PhysRevLett.94.053601

©2005 American Physical Society

Authors & Affiliations

Xiaoying Li*, Paul L. Voss, Jay E. Sharping, and Prem Kumar

  • Center for Photonic Communication and Computing, ECE Department, Northwestern University, Evanston, Illinois 60208-3118, USA

  • *Electronic address: xyli@ece.northwestern.edu

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Issue

Vol. 94, Iss. 5 — 11 February 2005

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