量子临界系统中控制参量猝灭所作功的统计
The Statistics of the Work Done on a Quantum Critical System by Quenching a Control Parameter
摘要:
我们研究了量子临界系统中哈密顿量中的一个控制参数的猝灭所做的工作的统计。我们阐明的概率分布的工作和Loschirst回声,一个数量通常出现在背景下的移相之间的关系。利用这种联系,我们的特点的统计工作的量子伊辛链淬火局部或全球的横向场。我们表明,局部淬火开始在临界的概率分布的工作显示一个有趣的边缘奇异性。
英文摘要:
We study the statistics of the work done on a quantum critical system by quenching a control parameter in the Hamiltonian. We elucidate the relation between the probability distribution of the work and the Loschmidt echo, a quantity emerging usually in the context of dephasing. Using this connection we characterize the statistics of the work done on a quantum Ising chain by quenching locally or globally the transverse field. We show that for local quenches starting at criticality the probability distribution of the work displays an interesting edge singularity.
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