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

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

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.

Keywords: reduced dynamics relaxation decoherence

Received: 02 March 2010
Revised: 06 May 2010
Accepted manuscript online:

PACS:	02.30.-f	(Function theory, analysis)
	03.65.Yz	(Decoherence; open systems; quantum statistical methods)
	03.67.Lx	(Quantum computation architectures and implementations)

Fund: 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.

Cite this article:

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 2010 Chin. Phys. B 19 100308

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

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