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arXiv 0902.1895quant-ph
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多字母相移键控相干态量子密钥分发

Coherent State Quantum Key Distribution with Multi Letter Phase-Shift Keying

Denis Sych, Gerd Leuchs

摘要:

提出了一种利用光相干态的离散调制实现量子密钥分发的协议。信息被编码在相干态的可变相位中,相干态可以从二进制到连续调制的规则离散集合中选择,类似于经典通信中的相移键控。信息解码的同时零差测量两个正交和不需要主动选择的基础。该协议利用直接或反向和解,有和没有后选择。我们分析了协议的安全性,并展示了如何通过量子信号的所有可变参数的最佳选择来增强它。

英文摘要:

We present a protocol for quantum key distribution using discrete modulation of coherent states of light. Information is encoded in the variable phase of coherent states which can be chosen from a regular discrete set ranging from binary to continuous modulation, similar to phase-shift-keying in classical communication. Information is decoded by simultaneous homodyne measurement of both quadratures and requires no active choice of basis. The protocol utilizes either direct or reverse reconciliation, both with and without postselection. We analyze the security of the protocol and show how to enhance it by the optimal choice of all variable parameters of the quantum signal.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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