量子统计力学中的芝诺动力学
Zeno Dynamics in Quantum Statistical Mechanics
摘要:
在算符代数的框架下研究了量子统计力学中的量子Zeno效应。我们制定了一个条件的外观效果在W*-动力系统,在短期行为的动态。量子自旋系统的例子表明,这个条件可以有效地应用于量子统计力学模型。进一步,我们导出了Zeno生成元的一个显式形式,并利用它构造了Zeno动力学的Gibbs平衡态。作为一个具体的例子,我们考虑的X-Y模型,我们表明,在微观水平上的频繁测量,例如,一个单一的晶格位置,可以产生宏观影响,改变全球平衡。
英文摘要:
We study the quantum Zeno effect in quantum statistical mechanics within the operator algebraic framework. We formulate a condition for the appearance of the effect in W*-dynamical systems, in terms of the short-time behaviour of the dynamics. Examples of quantum spin systems show that this condition can be effectively applied to quantum statistical mechanical models. Further, we derive an explicit form of the Zeno generator, and use it to construct Gibbs equilibrium states for the Zeno dynamics. As a concrete example, we consider the X-Y model, for which we show that a frequent measurement at a microscopic level, e.g. a single lattice site, can produce a macroscopic effect in changing the global equilibrium.
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