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arXiv 2004.04163hep-thcond-mat.str-elquant-ph
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纠缠楔截面的场论研究:奇熵

A Field Theory Study of Entanglement Wedge Cross Section: Odd Entropy

Ali Mollabashi, Kotaro Tamaoka

摘要:

在二维自由标量场理论中,研究了与纠缠楔截面全息对偶的混合态的候选测度--奇纠缠熵(简称奇熵)。我们的研究仅限于高斯状态的标度不变的理论,以及他们的有限温度的推广,我们表明,奇熵是一个定义良好的措施混合状态。从全息实验结果出发,研究了奇熵和冯诺伊曼熵的区别。特别地,我们证明了大量的量子关联保证了奇熵大于冯诺伊曼熵,这与全息CFT定性一致。在一般情况下,我们还发现,这种差异甚至不是一个单调函数的大小(和之间的距离)的子系统。

英文摘要:

We study odd entanglement entropy (odd entropy in short), a candidate of measure for mixed states holographically dual to the entanglement wedge cross section, in two-dimensional free scalar field theories. Our study is restricted to Gaussian states of scale-invariant theories as well as their finite temperature generalizations, for which we show that the odd entropy is a well-defined measure for mixed states. Motivated from holographic results, the difference between odd and von Neumann entropy is also studied. In particular, we show that large amounts of quantum correlations ensure the odd entropy to be larger than von Neumann entropy, which is qualitatively consistent with the holographic CFT. In general cases, we also find that this difference is not even a monotonic function with respect to size of (and distance between) subsystems.

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