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3 Feb 2003

Volume 82, Issue 5, pp. 665-834

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Appl. Phys. Lett. 82, 775 (2003); http://dx.doi.org/10.1063/1.1541091 (3 pages)

Sebastiaan van Dijken, Xin Jiang, and Stuart S. P. Parkin
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Time-division single-photon Sagnac interferometer for quantum key distribution

Chunyuan Zhou and Heping Zeng

Appl. Phys. Lett. 82, 832 (2003); http://dx.doi.org/10.1063/1.1541102 (3 pages) | Cited 6 times

Online Publication Date: 28 January 2003

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We introduce a single-photon Sagnac interferometer for quantum cryptography using time-division phase modulation. The interferometer was arranged to allow coherent laser pulses to travel clockwise and counter-clockwise along the same fiber loop with the corresponding phases modulated in separated periods, interfering at the exit coupler. High visibility of the single-photon interference was observed over a long-distance Sagnac loop. Stable performance was realized by passive compensation of stress and temperature-dependent drifts of the fiber-optic path. Time-division phase encoding and decoding can be realized by controlling the applied electric pulses on integrated phase modulators in the Sagnac loop, which makes this system suitable for a practical quantum cryptography system. © 2003 American Institute of Physics.
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03.67.Dd Quantum cryptography and communication security
07.60.Ly Interferometers
42.81.Uv Fiber networks
42.79.Sz Optical communication systems, multiplexers, and demultiplexers
42.79.Hp Optical processors, correlators, and modulators
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