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

共 35 条

[1]

Abragam A., 2002, PRINCIPLES NUCL MAGN

[2]

[Anonymous], 1964, ZH EKSP TEOR FIZ+

[3] Generalized Jordan-Wigner transformations [J].

Batista, CD ;

Ortiz, G .

PHYSICAL REVIEW LETTERS, 2001, 86 (06) :1082-1085

[4] Quantum information and computation [J].

Bennett, CH ;

DiVincenzo, DP .

NATURE, 2000, 404 (6775) :247-255

[5] 19F/29Si distance determination in fluoride-containing octadecasil by Hartmann-Hahn cross-polarization under fast magic-angle spinning [J].

Bertani, P ;

Raya, J ;

Reinheimer, P ;

Gougeon, R ;

Delmotte, L ;

Hirschinger, J .

SOLID STATE NUCLEAR MAGNETIC RESONANCE, 1999, 13 (04) :219-229

[6] CONDUCTANCE OF A DISORDERED LINEAR-CHAIN INCLUDING INELASTIC-SCATTERING EVENTS [J].

DAMATO, JL ;

PASTAWSKI, HM .

PHYSICAL REVIEW B, 1990, 41 (11) :7411-7420

[7] QUANTUM-THEORY OF NONEQUILIBRIUM PROCESSES .1. [J].

DANIELEWICZ, P .

ANNALS OF PHYSICS, 1984, 152 (02) :239-304

[8] Spin projection chromatography [J].

Danieli, EP ;

Pastawski, HM ;

Levstein, PR .

CHEMICAL PHYSICS LETTERS, 2004, 384 (4-6) :306-311

[9] Exact spin dynamics of inhomogeneous 1-d systems at high temperature [J].

Danieli, EP ;

Pastawski, HM ;

Levstein, PR .

PHYSICA B-CONDENSED MATTER, 2002, 320 (1-4) :351-353

[10] Quantum oscillations without quantum coherence [J].

Dobrovitski, VV ;

De Raedt, HA ;

Katsnelson, MI ;

Harmon, BN .

PHYSICAL REVIEW LETTERS, 2003, 90 (21) :4-210401

← 1 2 3 4 →