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arXiv 1503.07771hep-thcond-mat.otherquant-ph
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量子场论中部分测量后面积定律的命运

Fate of the area-law after partial measurement in quantum field theories

M. A. Rajabpour

摘要:

在固定了$d=1,2$和$3$维中某些振子的位置(部分测量)后,数值计算了Klein-Gordon场论(耦合谐振子)基态的Rényi二分纠缠熵.我们表明,部分测量后,只要两个部分连接的面积定律是有效的,在一般的尺寸除了在$d=1$共形场论。当由于测量区域的存在而使两个部分断开时,纠缠熵相对于两个区域之间的最小距离呈指数下降。在无质量的情况下,衰变是幂律的,具有普遍的维数依赖指数。

英文摘要:

We calculate numerically the Rényi bipartite entanglement entropy of the ground state of Klein-Gordon field theory (coupled harmonic oscillators) after fixing the position (partial measurement) of some of the oscillators in $d=1,2$ and $3$ dimensions. We show that after partial measurement as far as the two parts are connected the area-law is valid in generic dimensions except in $d=1$ conformal field theories. When due to the measured region the two parts are disconnected, the entanglement entropy decreases exponentially with respect to the minimum distance between the regions. In the massless case the decay is power-law with a universal dimension-dependent exponent.

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