Comparative studies of open qubit via Bloch equation and master equation of Redfield form

doi:10.1088/1674-1056/19/10/100308

中国物理B ›› 2010, Vol. 19 ›› Issue (10): 100308-100308.doi: 10.1088/1674-1056/19/10/100308

Comparative studies of open qubit via Bloch equation and master equation of Redfield form

沈燕, 卢俞平, 梁先庭

Department of Physics and Institute of Modern Physics, Ningbo University, Ningbo 315211, China

收稿日期:2010-03-02 修回日期:2010-05-06 出版日期:2010-10-15 发布日期:2010-10-15
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 10675066), Natural Science Foundation of Ningbo City (Grant No. 2008A610098), and K.C. Wong Magna Foundation in Ningbo University.

Comparative studies of open qubit via Bloch equation and master equation of Redfield form

Shen Yan(沈燕), Lu Yu-Ping(卢俞平), and Liang Xian-Ting(梁先庭)^†ger

Department of Physics and Institute of Modern Physics, Ningbo University, Ningbo 315211, China

Received:2010-03-02 Revised:2010-05-06 Online:2010-10-15 Published:2010-10-15
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 10675066), Natural Science Foundation of Ningbo City (Grant No. 2008A610098), and K.C. Wong Magna Foundation in Ningbo University.

摘要/Abstract

摘要： In this paper, we investigate the dynamics of an open qubit model by solving two sets of its reduced dynamical equations. One set of the equations is the well-known Bloch equations and the other is the widely investigated master equations of Redfield form. Both of them are obtained from the perturbation approximation which demands the system of interest weakly coupled to its environment. It is shown that the qubit has a longer decoherence and relaxiation time as the dynamics is described by the Redfield equantions.

Abstract: In this paper, we investigate the dynamics of an open qubit model by solving two sets of its reduced dynamical equations. One set of the equations is the well-known Bloch equations and the other is the widely investigated master equations of Redfield form. Both of them are obtained from the perturbation approximation which demands the system of interest weakly coupled to its environment. It is shown that the qubit has a longer decoherence and relaxiation time as the dynamics is described by the Redfield equantions.

Key words: reduced dynamics, relaxation, decoherence

中图分类号: (Function theory, analysis)

02.30.-f

03.65.Yz (Decoherence; open systems; quantum statistical methods) 03.67.Lx (Quantum computation architectures and implementations)

沈燕, 卢俞平, 梁先庭. Comparative studies of open qubit via Bloch equation and master equation of Redfield form[J]. 中国物理B, 2010, 19(10): 100308-100308.

Shen Yan(沈燕), Lu Yu-Ping(卢俞平), and Liang Xian-Ting(梁先庭). Comparative studies of open qubit via Bloch equation and master equation of Redfield form[J]. Chin. Phys. B, 2010, 19(10): 100308-100308.

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Comparative studies of open qubit via Bloch equation and master equation of Redfield form

Comparative studies of open qubit via Bloch equation and master equation of Redfield form

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