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Proceedings Paper

Quantum quadrature amplitude modulation system and its applicability to coherent-state quantum cryptography
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Paper Abstract

The quadrature amplitude modulation (QAM) signal of coherent state of light is applied to the quantum stream cipher by Y-00 protocol. We first discuss on the performance of the square-root measurement (SRM) for the QAM signals in comparison with the optimum receiver. It is shown that the quantum stream cipher with the QAM signals is designed by using the SRM, taking account of the ciphertext-only attack and the known/chosen plain attack. Furthermore, the modification of the quantum stream cipher with the QAM signals is considered.

Paper Details

Date Published: 18 August 2005
PDF: 8 pages
Proc. SPIE 5893, Quantum Communications and Quantum Imaging III, 589303 (18 August 2005); doi: 10.1117/12.618719
Show Author Affiliations
Kentaro Kato, Chuo University (Japan)
Osamu Hirota, Chuo University (Japan)
Tamagawa Univ. (Japan)


Published in SPIE Proceedings Vol. 5893:
Quantum Communications and Quantum Imaging III
Ronald E. Meyers; Yanhua Shih, Editor(s)

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