Thermal bound entanglement in macroscopic systems and area law.
Thermal bound entanglement in macroscopic systems and area law.
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宏观系统中的热束缚纠缠和面积定律。
DOI：
10.1103/physrevlett.100.080502
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发表时间：
2008
影响因子：
8.6
通讯作者：
A. Acín
中科院分区：
文献类型：
--
作者：
A. Ferraro;D. Cavalcanti;A. García;A. Acín
量子多体系统中会自然出现束缚纠缠吗？我们解决这个问题，显示存在的束缚纠缠的热态的谐振子系统组成的任意数量的粒子。通过对不同分区的负性的显式计算，我们发现了一个温度范围，在这个温度范围内，尽管系统是全局纠缠的，但是通过局部操作可以提取出纠缠。我们提供了一个解释，这一结果的纠缠区的法律，这些系统的典型。最后，我们讨论了这一结果的推广到其他系统，包括自旋链。
Does bound entanglement naturally appear in quantum many-body systems? We address this question by showing the existence of bound-entangled thermal states for harmonic oscillator systems consisting of an arbitrary number of particles. By explicit calculations of the negativity for different partitions, we find a range of temperatures for which no entanglement can be distilled by means of local operations, despite the system being globally entangled. We offer an interpretation of this result in terms of entanglement-area laws, typical of these systems. Finally, we discuss generalizations of this result to other systems, including spin chains.