Stable single-photon interference in a 1 km fiber-optic Mach-Zehnder interferometer with continuous phase adjustment

被引：44
作者：
Xavier, G. B. [1 ]
von der Weid, J. P. [1 ]
机构：
[1] Pontifical Catholic Univ Rio de Janeiro, Ctr Telecommun Studies, BR-22451900 Rio De Janeiro, Brazil
来源：
OPTICS LETTERS | 2011年 / 36卷 / 10期
关键词：
D O I：
10.1364/OL.36.001764
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We experimentally demonstrate stable and user-adjustable single-photon interference in a 1 km long fiber-optic Mach-Zehnder interferometer, using an active phase control system with the feedback provided by a classical laser. We are able to continuously tune the single-photon phase difference between the interferometer arms using a phase modulator, which is synchronized with the gate window of the single-photon detectors. The phase control system employs a piezoelectric fiber stretcher to stabilize the phase drift in the interferometer. A single-photon net visibility of 0.97 is obtained, yielding future possibilities for experimental realizations of quantum repeaters in optical fibers and violation of Bell's inequalities using genuine energy-time entanglement. (C) 2011 Optical Society of America
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页码：1764 / 1766
页数：3
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