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Optics Letters

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  • Vol. 36, Iss. 10 — May. 15, 2011
  • pp: 1764–1766

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

G. B. Xavier and J. P. von der Weid  »View Author Affiliations


Optics Letters, Vol. 36, Issue 10, pp. 1764-1766 (2011)
http://dx.doi.org/10.1364/OL.36.001764


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Abstract

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.

© 2011 Optical Society of America

OCIS Codes
(060.2310) Fiber optics and optical communications : Fiber optics
(260.3160) Physical optics : Interference
(060.5565) Fiber optics and optical communications : Quantum communications

ToC Category:
Fiber Optics and Optical Communications

History
Original Manuscript: March 29, 2011
Revised Manuscript: April 13, 2011
Manuscript Accepted: April 13, 2011
Published: May 5, 2011

Citation
G. B. Xavier and J. P. von der Weid, "Stable single-photon interference in a 1 km fiber-optic Mach–Zehnder interferometer with continuous phase adjustment," Opt. Lett. 36, 1764-1766 (2011)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-36-10-1764


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