自旋链中的随机共振现象
Stochastic resonance phenomena in spin chains
摘要：
我们讨论了耦合量子自旋系统中的类随机共振效应。在这里，我们专注于一个信息理论的方法和分析的稳态量子关联（纠缠），以及在系统中的全球相关时，受到不同形式的本地退相干。在存在衰变的情况下，已经表明，只有当噪声强度高于某个阈值时，系统才会显示量子关联。我们将这一结果扩展到海森堡XYZ交换相互作用的情况下，并修改和澄清这种行为的机制。在存在纯退相的情况下，我们证明了系统在稳态下总是保持可分的。当这两种类型的噪声存在时，我们表明，该系统仍然可以表现出纠缠很长一段时间，提供的纯退相率不是太大。
英文摘要：
We discuss stochastic resonance-like effects in the context of coupled quantum spin systems. We focus here on an information-theoretic approach and analyze the steady state quantum correlations (entanglement) as well as the global correlations in the system when subject to different forms of local decoherence. In the presence of decay, it has been shown that the system displays quantum correlations only when the noise strength is above a certain threshold. We extend this result to the case of a Heisenberg XYZ exchange interaction and revise and clarify the mechanisms underlying this behaviour. In the presence of pure dephasing, we show that the system always remains separable in the steady state. When both types of noise are present, we show that the system can still exhibit entanglement for long times, provided that the pure dephasing rate is not too large.
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