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arXiv 1603.03057hep-thcond-mat.str-el
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二维共形场论中激发态的相对熵

Relative entropy of excited states in two dimensional conformal field theories

Gábor Sárosi, Tomonori Ugajin

摘要:

研究了二维共形场论中两个激发态约化密度矩阵之间的相对熵和迹平方距离。我们找到了在单个小区间极限内具有相同共形维数的两个初级态之间的相对熵的一般公式,并发现在这种情况下,相对熵与迹平方距离成正比。我们通过计算两个广义自由场之间的相对熵和临界伊辛模型的自旋算符和无序算符之间的迹平方距离来检验我们的一般公式。当两个算子具有不同的共形维数时,我们也给出了小区间展开式中相对熵的主导项。当CFT没有比应力张量轻的原丝时,这是普遍的。结果再现了以前已知的特殊情况。

英文摘要:

We study the relative entropy and the trace square distance, both of which measure the distance between reduced density matrices of two excited states in two dimensional conformal field theories. We find a general formula for the relative entropy between two primary states with the same conformal dimension in the limit of a single small interval and find that in this case the relative entropy is proportional to the trace square distance. We check our general formulae by calculating the relative entropy between two generalized free fields and the trace square distance between the spin and disorder operators of the critical Ising model. We also give the leading term of the relative entropy in the small interval expansion when the two operators have different conformal dimensions. This turns out to be universal when the CFT has no primaires lighter than the stress tensor. The result reproduces the previously known special cases.

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