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arXiv 1804.09693quant-ph
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具有测量后信息的态鉴别和量子测量的不相容性

State discrimination with post-measurement information and incompatibility of quantum measurements

Claudio Carmeli, Teiko Heinosaari, Alessandro Toigo

摘要:

我们讨论以下的标准最小误差状态判别问题的变种:爱丽丝挑选的状态,她发送给鲍勃之间的几个不相交的状态合奏,她传达给他选择的合奏只有在以后的时间。然后出现两种不同的情况:或者允许Bob在Alice已经向他宣布了所选择的系综之后安排他的测量设置,或者他被迫在Alice的宣布之前执行测量。在后一种情况下,他只能在Alice的额外信息可用时对测量结果进行后处理。我们比较了两种情况下的最佳猜测概率,我们证明了它们是相同的,当且仅当存在兼容的最佳测量的所有爱丽丝的状态合奏。在这种情况下,后处理任何相应的联合测量是Bob在测量后信息场景中的最佳策略。此外,我们还建立了测量后信息歧视与标准状态歧视之间的联系。通过这种联系,并利用对称性的存在,我们能够计算在许多具体的例子中的各种猜测概率。

英文摘要:

We discuss the following variant of the standard minimum error state discrimination problem: Alice picks the state she sends to Bob among one of several disjoint state ensembles, and she communicates him the chosen ensemble only at a later time. Two different scenarios then arise: either Bob is allowed to arrange his measurement set-up after Alice has announced him the chosen ensemble, or he is forced to perform the measurement before of Alice's announcement. In the latter case, he can only post-process his measurement outcome when Alice's extra information becomes available. We compare the optimal guessing probabilities in the two scenarios, and we prove that they are the same if and only if there exist compatible optimal measurements for all of Alice's state ensembles. When this is the case, post-processing any of the corresponding joint measurements is Bob's optimal strategy in the post-measurement information scenario. Furthermore, we establish a connection between discrimination with post-measurement information and the standard state discrimination. By means of this connection and exploiting the presence of symmetries, we are able to compute the various guessing probabilities in many concrete examples.

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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