dorsal/arxiv
View SchemaAn integrable optical-fiber source of polarization entangled photon-pairs in the telecom band
| Authors | Xiaoying Li, Chuang Liang, Kim Fook Lee, Jun Chen, Paul L. Voss, Prem Kumar |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0601087 |
| URL | https://arxiv.org/abs/quant-ph/0601087 |
| DOI | 10.1103/PhysRevA.73.052301 |
| Journal | Phy. Rev. A. Vol. 73, 052301 (2006) |
Abstract
We demonstrate an optical-fiber based source of polarization entangled photon-pairs with improved quality and efficiency, which has been integrated with off-the-shelf telecom components and is, therefore, well suited for quantum communication applications in the 1550 nm telecom band. Polarization entanglement is produced by simultaneously pumping a loop of standard dispersion-shifted fiber with two orthogonally-polarized pump pulses, one propagating in the clockwise and the other in the counter-clockwise direction. We characterize this source by investigating two-photon interference between the generated signal-idler photon-pairs under various conditions. The experimental parameters are carefully optimized to maximize the generated photon-pair correlation and to minimize contamination of the entangled photon-pairs from extraneously scattered background photons that are produced by the pump pulses for two reasons: i) spontaneous Raman scattering causes uncorrelated photons to be emitted in the signal/idler bands and ii) broadening of the pump-pulse spectrum due to self-phase modulation causes pump photons to leak into the signal/idler bands. We obtain two-photon interference with visibility $>90$% without subtracting counts caused by the background photons (only dark counts of the detectors are subtracted), when the mean photon number in the signal (idler) channel is about 0.02/pulse, while no interference is observed in direct detection of either the signal or the idler photons.
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"abstract": "We demonstrate an optical-fiber based source of polarization entangled\nphoton-pairs with improved quality and efficiency, which has been integrated\nwith off-the-shelf telecom components and is, therefore, well suited for\nquantum communication applications in the 1550 nm telecom band. Polarization\nentanglement is produced by simultaneously pumping a loop of standard\ndispersion-shifted fiber with two orthogonally-polarized pump pulses, one\npropagating in the clockwise and the other in the counter-clockwise direction.\nWe characterize this source by investigating two-photon interference between\nthe generated signal-idler photon-pairs under various conditions. The\nexperimental parameters are carefully optimized to maximize the generated\nphoton-pair correlation and to minimize contamination of the entangled\nphoton-pairs from extraneously scattered background photons that are produced\nby the pump pulses for two reasons: i) spontaneous Raman scattering causes\nuncorrelated photons to be emitted in the signal/idler bands and ii) broadening\nof the pump-pulse spectrum due to self-phase modulation causes pump photons to\nleak into the signal/idler bands. We obtain two-photon interference with\nvisibility $\u003e90$% without subtracting counts caused by the background photons\n(only dark counts of the detectors are subtracted), when the mean photon number\nin the signal (idler) channel is about 0.02/pulse, while no interference is\nobserved in direct detection of either the signal or the idler photons.",
"arxiv_id": "quant-ph/0601087",
"authors": [
"Xiaoying Li",
"Chuang Liang",
"Kim Fook Lee",
"Jun Chen",
"Paul L. Voss",
"Prem Kumar"
],
"categories": [
"quant-ph"
],
"doi": "10.1103/PhysRevA.73.052301",
"journal_ref": "Phy. Rev. A. Vol. 73, 052301 (2006)",
"title": "An integrable optical-fiber source of polarization entangled photon-pairs in the telecom band",
"url": "https://arxiv.org/abs/quant-ph/0601087"
},
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