Discrepancies between decoherence and the Loschmidt echo

被引：7

作者：

Casabone, B. ^{[1
,2
]}

Garcia-Mata, I. ^{[3
]}

Wisniacki, D. A. ^{[1
,2
]}

机构：

[1] UBA, FCEyN, Dept Fis, Buenos Aires, DF, Argentina

[2] UBA, FCEyN, IFIBA, Buenos Aires, DF, Argentina

[3] Comis Nacl Energia Atom, Dept Fis, Lab TANDAR, RA-1429 Buenos Aires, DF, Argentina

来源：

EPL | 2010年 / 89卷 / 05期

关键词：

QUANTUM; SYSTEMS; CHAOS;

D O I：

10.1209/0295-5075/89/50009

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The Loschmidt echo and the purity are two quantities that can provide invaluable information about the evolution of a quantum system. While the Loschmidt echo characterizes instability and sensitivity to perturbations, purity measures the loss of coherence produced by an environment coupled to the system. For classically chaotic systems both quantities display a number of-supposedly universal-regimes that can lead to think of them as equivalent quantities. We study the decay of the Loschmidt echo and the purity for systems with finite-dimensional Hilbert space and present numerical evidence of some fundamental differences between them. Copyright (C) EPLA, 2010

引用

页数：6

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