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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Telecom-band entanglement generation in standard fibers

Jun Chen, Xiaoying Li, Paul L. Voss, Prem Kumar

Published Jan 11, 2005• 2 citations
Publisher

Abstract

We review on-going progress in the development of fiber-based telecom-band entanglement sources. Two different schemes (a Sagnac-loop scheme and a counter-propagating scheme) for generating polarization entanglement are reviewed and the pros and cons of each are summarized. A new scheme, called the double-loop scheme is proposed, which is theoretically shown to be capable of combining the benefits and avoiding the pitfalls of each previous scheme.

DOI
10.1117/12.581917

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We propose and experimentally demonstrate a generation scheme of telecom-band fiber-based frequency-degenerate polarization-entanglement photon pair source. Basing on the vector spontaneous four wave mixing process in a Sagnac fiber loop along the clockwise and counter-clockwise directions, two frequency-degenerate and polarization orthogonal biphoton states generate and then lead to the polarization entanglement states by the interference at the beamsplitter. The raw fringe visibilities of the two-photon interferences are 97% and 92%, respectively. Information can be encoded on the generated photon pairs using the polarization entangled Bell states. It is demonstrated by a simplified Bell state measurement with a fringe visibility of 83%.