Spin squeezing under decoherence: Role of the quantum phase transition

Spin squeezing under decoherence: Role of the quantum phase transition
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退相干下的自旋挤压:量子相变的作用

DOI:
10.1103/physreva.84.052307
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发表时间:
2011-11
期刊:
影响因子:
2.9
通讯作者:
Sun, Zhe
Sun, Zhe
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Sun, Zhe

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为了观察两两纠缠以外的多体关联,我们研究了具有量子相变环境中自旋1/2系综的自旋压缩演化。系综的每个自旋一半在其自己的消相干通道下演化,该通道由一个被自旋1/2 XY链包围的中心自旋1/2建模。我们用四个自旋压缩参数来描述压缩,并对集体初态的自旋系综解析地计算了它们在时间t的表达式。结果表明,辅助系综的自旋压缩很好地指示了环境的临界区。环境的量子涨落加速了自旋压缩的衰变,并极大地改变了自旋压缩。
In order to witness multipartite correlations beyond pairwise entanglement, we study the spin-squeezing evolution of a spin-1/2 ensemble in environments with quantum phase transitions. Each spin half of the ensemble evolves under its own decoherence channel, which is modeled by a central spin 1/2 surrounded by a spin-1/2 XY chain. We employ four spin-squeezing parameters to describe squeezing, and their expressions at time t are analytically calculated for the spin ensemble in a collective initial state. It is found that spin squeezing of an auxiliary ensemble signals very well the critical regions of the environment. Quantum fluctuations of the environment accelerate the decay of spin squeezing and dramatically change spin squeezing.
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