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Proceedings Paper

Quantum stream cipher: Part V. On the optimal modulation scheme and the implementation of deliberate signal randomization
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Paper Abstract

This paper considers two issues on the quantum stream cipher by Yuen-2000 (Y-00) protocol. In the fist part of this paper we investigate the optimal modulation scheme for the basic model of the quantum stream cipher by Y-00 protocol, and in the remaining part we study the deliberate signal randomization. For the problem on the optimal modulation scheme, several modulation schemes are investigated for the cipher text-only attacks and the known plaintext attack under the error probability criterion and the information criterion to find the preferable modulation scheme. As a result, it will be shown that the phase shift keying signal yields the best performance among the modulation schemes investigated in our consideration by numerical simulations. After that, the roperty of the randomization technique called the deliberate signal randomization is considered for the cipher text-only attacks and the known plaintext attack in the information criterion. From this, it will be shown by numerical simulations that the amount of leakage of information from the legitimate user to the eavesdropper is reduced by the deliberate signal randomization. At the last section we will mention about the implementation issues of the deliberate signal randomization, taking account of the numerical results.

Paper Details

Date Published: 25 September 2007
PDF: 11 pages
Proc. SPIE 6710, Quantum Communications and Quantum Imaging V, 67100T (25 September 2007); doi: 10.1117/12.733296
Show Author Affiliations
Kentaro Kato, National Tsing Hua Univ. (Taiwan)
Osamu Hirota, Tamagawa Univ. (Japan)


Published in SPIE Proceedings Vol. 6710:
Quantum Communications and Quantum Imaging V
Ronald E. Meyers; Yanhua Shih; Keith S. Deacon, Editor(s)

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