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arXiv 1408.0934quant-ph
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区分量子测量的最优Single Shot策略

Optimal single shot strategies for discrimination of quantum measurements

Michal Sedlak, Mario Ziman

摘要:

本文研究了在n个未知测量只能使用一次的情况下m个量子测量的判别问题。我们发现,辅助歧视程序提供了一个非平凡的优势,简单的(无辅助)计划完美的可扩展性,我们证明,不可避免地m <= n。本文给出了一般二元测量完全可分解的充要条件。我们证明了在白噪声条件下对投影量子比特测量及其混合测量的最优化鉴别等价于对特定量子态的鉴别。特别地,描述了具有固定失败率的投影量子比特测量的最佳鉴别协议(利用最大纠缠测试态)。虽然两个投影量子比特测量的最小误差鉴别可以在不需要任何纠缠的情况下实现,但我们证明了三个投影量子比特测量的鉴别需要一个二分探测态。此外,当测量值不是射影的时,非最大纠缠测试态的性能优于最大纠缠测试态。

英文摘要:

We study discrimination of m quantum measurements in the scenario when the unknown measurement with n outcomes can be used only once. We show that ancilla-assisted discrimination procedures provide a nontrivial advantage over simple (ancilla-free) schemes for perfect distinguishability and we prove that inevitably m <= n. We derive necessary and sufficient conditions of perfect distinguishability of general binary measurements. We show that the optimization of the discrimination of projective qubit measurements and their mixtures with white noise is equivalent to the discrimination of specific quantum states. In particular, the optimal protocol for discrimination of projective qubit measurements with fixed failure rate (exploiting maximally entangled test state) is described. While minimum error discrimination of two projective qubit measurements can be realized without any need of entanglement, we show that discrimination of three projective qubit measurements requires a bipartite probe state. Moreover, when the measurements are not projective, the non-maximally entangled test states can outperform the maximally entangled ones.

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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