Coherent pulse position modulation quantum cipher supported by secret key

Details Coherent pulse position modulation quantum cipher supported by secret key Coherent pulse position modulation quantum cipher supported by secret key

2010-07-10

arxiv.org/abs/1007.1696v1

Physics

Quantum Physics

5pages, 1figure, submitted to Physical Review A

Scientific paper

A quantum cipher supported by a secret key so called keyed communication in quantum noise (KCQ) is very attractive in implementing high speed key generation and secure data transmission. However, Yuen-2000 as a basic model of KCQ has a difficulty to ensure the quantitative security evaluation because all physical parameter for the cipher system is finite. Recently, an outline of a generalized scheme so called coherent pulse position modulation(CPPM) to show the rigorous security analysis is given, where the parameters are allowed to be asymptotical. This may open a new way for the quantum key distribution with coherent states of considerable energy and high speed. In this paper, we clarify a generation method of CPPM quantum signal by using a theory of unitary operator and symplectic transformation, and show an asymptotic property of security and its numerical examples.

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