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arXiv quant-ph/0207116quant-ph
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量子测量中的经典关联和纠缠

Classical Correlations and Entanglement in Quantum Measurements

V. Vedral

摘要:

我们分析了一个量子测量的设备最初是在一个混合状态。我们表明,在测量中获得的信息量不等于系统和设备之间的纠缠量,而是等于两者之间的经典相关度。因此,我们推导出一个不确定性的表达式有关的信息增益的测量和初始混合的装置。环境和设备之间的最终纠缠也被证明是相关的测量的效率。

英文摘要:

We analyze a quantum measurement where the apparatus is initially in a mixed state. We show that the amount of information gained in a measurement is not equal to the amount of entanglement between the system and the apparatus, but is instead equal to the degree of classical correlations between the two. As a consequence, we derive an uncertainty-like expression relating the information gain in the measurement and the initial mixedness of the apparatus. Final entanglement between the environment and the apparatus is also shown to be relevant for the efficiency of the measurement.

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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