Characterization of fiber-generated entangled photon pairs with superconducting single-photon detectors

被引：30

作者：

Liang, Chuang

Lee, Kim Fook

Medic, Milja

Kumar, Prem

Hadfield, Robert H.

Nam, Sae Woo

机构：

[1] Northwestern Univ, Ctr Photon Commun & Comp, Dept Elect Engn & Comp Sci, Evanston, IL 60208 USA

[2] Natl Inst Stand & Technol, Boulder, CO 80305 USA

来源：

OPTICS EXPRESS | 2007年 / 15卷 / 03期

关键词：

12;

D O I：

10.1364/OE.15.001322

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We demonstrate the suitability of fiber-generated entangled photon pairs for practical quantum communications in the telecom band by measuring their properties with superconducting single-photon detectors that produce negligible dark counts. The photon pairs are created in approximately 5-ps duration windows at 50 MHz rate while the detectors are operated in ungated free running mode. We obtain a coincidence to accidental- coincidence ratio > 80 with raw photon-counting data, i.e., without making any post-measurement corrections. Using a previously demonstrated counter-propagating scheme we also produce polarization-entangled photon pairs at 50-MHz rate, which in coincidence detection directly yield two-photon interference with a fringe visibility > 98%.

引用

收藏

页码：1322 / 1327

页数：6

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