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arXiv 1802.09293cond-mat.stat-mech
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量子猝灭中功大偏差的奇异性

Singularities in large deviations of work in quantum quenches

P. Rotondo, J. Minar, J. P. Garrahan, I. Lesanovsky, M. Marcuzzi

摘要:

我们调查大偏差的工作中进行的量子淬火在两个不同的阶段分开的量子临界点,作为例子,迪克模型淬火从其superradiant其正常阶段。我们从洛什特振幅中提取出功的分布,并计算出相应的大偏差形式。将这些发现与[Phys. Rev. Lett. 109,250602(2012)]中,我们能够识别出一种实际上与迄今为止所识别的不同的机制:这里的速率函数表现出非分析点,这是在工作的罕见波动中存在非平衡相变的强烈指示。

英文摘要:

We investigate large deviations of the work performed in a quantum quench across two different phases separated by a quantum critical point, using as example the Dicke model quenched from its superradiant to its normal phase. We extract the distribution of the work from the Loschmidt amplitude and compute for both the corresponding large-deviation forms. Comparing these findings with the predictions of the classification scheme put forward in [Phys. Rev. Lett. 109, 250602 (2012)], we are able to identify a regime which is in fact distinct to the ones identified so far: here the rate function exhibits a non-analytical point which is a strong indication of the existence of an out-of-equilibrium phase transition in the rare fluctuations of the work.

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