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arXiv 2005.05408quant-phcond-mat.stat-mech
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量子关联熵

Quantum correlation entropy

Joseph Schindler, Dominik Šafránek, Anthony Aguirre

摘要:

我们研究了量子粗粒熵,证明了局域和全局粗粒熵之间的差距是纠缠熵对混合态和多体系统的自然推广。这种“量子关联熵”$S^{\rm QC}$在独立系统上是可加的,在局部幺正操作下是不变的,测量总的非经典关联(在具有严格经典关联的状态上消失),并减少到两体纯态的纠缠熵。它量化了通过局部测量可以理解量子系统的程度,并直接与非平衡热力学联系在一起,包括代表热力学熵产生的量子部分的下限。我们讨论了其他两个措施的非经典相关性,这种熵是等价的,并认为,他们一起提供了一个独特的degreically区别措施。

英文摘要:

We study quantum coarse-grained entropy and demonstrate that the gap in entropy between local and global coarse-grainings is a natural generalization of entanglement entropy to mixed states and multipartite systems. This "quantum correlation entropy" $S^{\rm QC}$ is additive over independent systems, is invariant under local unitary operations, measures total nonclassical correlations (vanishing on states with strictly classical correlation), and reduces to the entanglement entropy for bipartite pure states. It quantifies how well a quantum system can be understood via local measurements, and ties directly to non-equilibrium thermodynamics, including representing a lower bound on the quantum part of thermodynamic entropy production. We discuss two other measures of nonclassical correlation to which this entropy is equivalent, and argue that together they provide a unique thermodynamically distinguished measure.

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