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International Conference on Quantum Information

Entangled state engineering in single-mode fibers

Joseph B. Altepeter, Jun Chen, Prem Kumar

Published Jan 1, 2008• 2 citations
Publisher

Abstract

We present novel designs for fiber-based sources of entangled photon pairs, and investigate the increasing number of available options for quantum-state engineering in the telecom band using four-wave mixing in standard fibers.
DOI
10.1364/icqi.2008.qma4

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We report the first entanglement swapping experiment using entangled photon-pair sources based on spontaneous four-wave mixing (SFWM). The 1.5-μm band entangled photon pairs generated by SFWM in two independent 500-m dispersion shifted fibers exhibited quantum interference, thanks to the negligible walk-off between the pump and photon pairs. The use of 500-MHz gated-mode InGaAs/InP avalanche photodiodes based on the sine-wave gating technique increased the fourfold coincidence rate significantly. As a result, the formation of an entanglement between photons from independent sources was successfully observed.