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Proceedings Paper

Security analysis of quantum cryptography with modified coherent state
Author(s): Ya Jun Lu; Zhe Yu Ou
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Paper Abstract

A modified coherent state is created by mixing a coherent state with optical field from parametric down-conversion in a beam splitter. A two-photon interference effect will cancel the two-photon state. This modified coherent state has ad-vantage over the conventional weak coherent state currently used widely in quantum cryptography. We make numerical analysis on the improvement in secure data rate and transmission distance with the modified coherent state. With a three-photon interference effect to cancel the three-photon state, further improvement is shown to be possible in a newly proposed protocol for quantum cryptography.

Paper Details

Date Published: 19 October 2004
PDF: 8 pages
Proc. SPIE 5551, Quantum Communications and Quantum Imaging II, (19 October 2004); doi: 10.1117/12.561718
Show Author Affiliations
Ya Jun Lu, Indiana Univ.-Purdue Univ. (United States)
Zhe Yu Ou, Indiana Univ.-Purdue Univ. (United States)


Published in SPIE Proceedings Vol. 5551:
Quantum Communications and Quantum Imaging II
Ronald E. Meyers; Yanhua Shih, Editor(s)

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