Physics – Quantum Physics
Scientific paper
2011-04-14
Opt. Lett. 36, 1764 (2011)
Physics
Quantum Physics
3 pages, 3 figures
Scientific paper
10.1364/OL.36.001764
We experimentally demonstrate stable and user-adjustable single-photon interference in a 1 km long fiber- optical 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
der Weid Jean Pierre von
Xavier G. B.
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