Quantum dynamics under coherent and incoherent effects of a spin bath in the Keldysh formalism: application to a spin swapping operation

被引：16

作者：

Danieli, EP ^{[1
]}

Pastawski, HM ^{[1
]}

Alvarez, GA ^{[1
]}

机构：

[1] Univ Nacl Cordoba, Fac Matemat Astron & Fis, RA-5000 Cordoba, Argentina

来源：

CHEMICAL PHYSICS LETTERS | 2005年 / 402卷 / 1-3期

关键词：

D O I：

10.1016/j.cplett.2004.11.056

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We develop the Keldysh formalism for the polarization dynamics of an open spin system. We apply it to the swapping between two qubit states in a model describing an NMR cross-polarization experiment. The environment is a set of interacting spins. For fast fluctuations in the environment, the analytical solution shows effects missed by the secular approximation of the quantum master equation for the density matrix: a frequency decrease depending on the system-environment escape rate and the quantum quadratic short time behavior. Considering full memory of the bath correlations yields a progressive change of the swapping frequency. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：88 / 95

页数：8

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