Abstract

The procedure of quantum measurement—unambiguous discrimination—of four two-mode coherent states of the optical field which are of interest for information transmission by the optical communication channel is studied. It is shown that complex conjugation of the amplitude of one of the modes leads to better discriminability between the states. An interferometric scheme for unambiguous discrimination between such states is proposed and the probability of successful discrimination is found. Applications of the considered set of states in quantum cryptography, quantum teleportation, and optical communication with a high level of losses are discussed.

中文翻译：

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双模光场相干态之间的明确区分

摘要

研究了光场的四个双模相干态的量子测量过程（明确区分），这是光通信信道进行信息传输所需要的。结果表明，模式之一的振幅的复杂共轭导致状态之间更好的可分辨性。提出了一种用于在这些状态之间进行明确区分的干涉方案，并找到了成功区分的可能性。讨论了所考虑的状态集在量子密码术，量子隐形传态和光通信中的高损耗。