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arXiv quant-ph/0404122quant-ph
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关于Hilbert空间的量子性

On the Quantumness of a Hilbert Space

Christopher A. Fuchs

摘要:

我们推导出一个希尔伯特空间(定义在quant-ph/0302092)的量子性的精确表达式,并表明,在复合希尔伯特空间的信号状态必须包含至少一些纠缠态,以实现这样的灵敏度。此外,我们建立了对称信息完全信号系综的可达保真度等于量子度。虽然因为这一点对窃听者来说是最麻烦的,但事实证明,在这种情况下,她仍然很容易实现可访问的保真度:由秩1 POVM元素组成的任何测量都是最佳测量,并且再现与测量结果相关联的投影仪的简单过程是最佳输出策略。两个和两个电梯的故事增加了娱乐。

英文摘要:

We derive an exact expression for the quantumness of a Hilbert space (defined in quant-ph/0302092), and show that in composite Hilbert spaces the signal states must contain at least some entangled states in order to achieve such a sensitivity. Furthermore, we establish that the accessible fidelity for symmetric informationally complete signal ensembles is equal to the quantumness. Though spelling the most trouble for an eavesdropper because of this, it turns out that the accessible fidelity is nevertheless easy for her to achieve in this case: Any measurement consisting of rank-one POVM elements is an optimal measurement, and the simple procedure of reproducing the projector associated with the measurement outcome is an optimal output strategy. Two and epsilon elevator stories are added for entertainment.

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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