无损多方系统纠缠的冻结与解冻
Freezing and Thawing of Entanglement in Lossless Multiparty Systems
摘要：
纠缠冻结已被证明存在于各种噪声退相干机制中。在这里，我们通过研究无损多方系统中的冻结行为来探索其普遍性，即，$N$ -位光晶格（或等效的自旋链）系统。在无限大情况下（$N\rightarrow\infty$）发现了纠缠冻结的有趣现象。当多方系统的规模减小到有限的$N$时，有趣的动力学纠缠“解冻”行为开始出现。特别地，随着时间的推移，可以识别出“冻结”和“解冻”的交替出现。我们的研究结果可能对量子任务中的纠缠控制提供有益的指导。
英文摘要：
Entanglement freezing has been demonstrated existing in various noisy decoherence mechanisms. Here we explore its universality by investigating freezing behavior in a lossless multiparty system, i.e., an $N$-site optical lattice (or equivalently spin-chain) system. Interesting phenomenon of permanent entanglement freezing is found for the infinite-size case ($N\rightarrow\infty$). As the multiparty system size reduces to finite $N$, the interesting behavior of dynamical entanglement "thawing" start to emerge. Especifically, alternative appearances of "freezing" and "thawing" can be identified as time evolves. Our results may provide useful guidance to entanglement control in quantum tasks.
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