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Rotation of Bloch sphere induced by Lamb shift in open two-levelsystems
Guo-You Wang,Ning Tang,Ying Liu,Hao-Sheng Zeng * #
Department of Physics, Hunan Normal University, Changsha 410081
*Correspondence author
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Funding: 高等学校博士学科点专项科研基金联合资助课题 （No.20124306110003）
Opened online:14 March 2014
Accepted by: none
Citation: Guo-You Wang,Ning Tang,Ying Liu.Rotation of Bloch sphere induced by Lamb shift in open two-levelsystems[OL]. [14 March 2014] http://en.paper.edu.cn/en_releasepaper/content/4589232
 
 
From a quite general Lindblad-like master equation of open two-level systems (qubits), we study the effect of Lamb shift to the non-Markovian dynamics. We find that the Lamb shift can induce a non-uniform rotation of the Bloch sphere, but does not affect the non-Markovianity of the open system dynamics.We determine the optimal initial-state pairs that maximize the backflow of information for the considered general dynamics and find an interesting phenomenon--the sudden change of the non-Markovianity. We relate the dynamics to the evolution of Bloch sphere to help us predicting or explaining the obtained results.
Keywords:Open systems; non-Markovianity; backflow of information
 
 
 

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