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Phys. Rev. A 72, 041804 (2005) [4 pages]

Generation of 1.5-μm band time-bin entanglement using spontaneous fiber four-wave mixing and planar light-wave circuit interferometers

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Hiroki Takesue *
NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato Wakamiya, Atsugi, Kanagawa, 243-0198, Japan

Kyo Inoue
Department of Electrical, Electronics and Information Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, 565-0871, Japan

Rapid Communication Received 13 June 2005; published 19 October 2005

This paper reports 1.5-μm band time-bin entanglement generation. We employed a spontaneous four-wave mixing process in a dispersion shifted fiber, with which correlated photon pairs with very narrow bandwidths were generated efficiently. To observe two-photon interference, we used planar lightwave circuit based interferometers that were operated stably without feedback control. As a result, we obtained coincidence fringes with 99% visibilities after subtracting accidental coincidences, and successfully distributed entangled photons over 20-km standard single-mode fiber without any deterioration in the quantum correlation.


©2005 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevA.72.041804
DOI: 10.1103/PhysRevA.72.041804
PACS: 42.50.Dv, 03.67.Mn, 42.65.Lm

* Electronic address: htakesue@will.brl.ntt.co.jp

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