Rotation of Bloch sphere induced by Lamb shift in open two-level systems

doi:10.1088/1674-1056/24/5/050302

中国物理B ›› 2015, Vol. 24 ›› Issue (5): 50302-050302.doi: 10.1088/1674-1056/24/5/050302

Rotation of Bloch sphere induced by Lamb shift in open two-level systems

王国友^{a b}, 唐宁^{a b}, 刘颖^{a b}, 曾浩生^{a b}

a Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, Hunan Normal University, Changsha 410081, China;
b Department of Physics, Hunan Normal University, Changsha 410081, China

收稿日期:2014-09-21 修回日期:2014-12-08 出版日期:2015-05-05 发布日期:2015-05-05
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11275064 and 11075050), the Specialized Research Fund for the Doctoral Program of Higher Education, China (Grant No. 20124306110003), the Program for Changjiang Scholars and Innovative Research Team in University, China (Grant No. IRT0964), and the Construct Program of the National Key Discipline, China.

Rotation of Bloch sphere induced by Lamb shift in open two-level systems

Wang Guo-You (王国友)^{a b}, Tang Ning (唐宁)^{a b}, Liu Ying (刘颖)^{a b}, Zeng Hao-Sheng (曾浩生)^{a b}

a Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, Hunan Normal University, Changsha 410081, China;
b Department of Physics, Hunan Normal University, Changsha 410081, China

Received:2014-09-21 Revised:2014-12-08 Online:2015-05-05 Published:2015-05-05
Contact: Zeng Hao-Sheng E-mail:hszeng@hunnu.edu.cn
About author:03.65.Ta; 03.65.Yz; 42.50.Lc
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11275064 and 11075050), the Specialized Research Fund for the Doctoral Program of Higher Education, China (Grant No. 20124306110003), the Program for Changjiang Scholars and Innovative Research Team in University, China (Grant No. IRT0964), and the Construct Program of the National Key Discipline, China.

摘要/Abstract

摘要：

From a quite general form of the Lindblad-like master equation of open two-level systems (qubits), we study the effect of Lamb shift on the non-Markovian dynamics. We find that the Lamb shift can induce a non-uniform rotation of the Bloch sphere, but that it 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 master equation and find an interesting phenomenon–the sudden change of the non-Markovianity. We relate the dynamics to the evolution of the Bloch sphere to help us comprehend the obtained results.

关键词: non-Markovianity, Lamb shift, Bloch sphere

Abstract:

Key words: non-Markovianity, Lamb shift, Bloch sphere

中图分类号: (Foundations of quantum mechanics; measurement theory)

03.65.Ta

03.65.Yz (Decoherence; open systems; quantum statistical methods) 42.50.Lc (Quantum fluctuations, quantum noise, and quantum jumps)

王国友, 唐宁, 刘颖, 曾浩生. Rotation of Bloch sphere induced by Lamb shift in open two-level systems[J]. 中国物理B, 2015, 24(5): 50302-050302.

Wang Guo-You (王国友), Tang Ning (唐宁), Liu Ying (刘颖), Zeng Hao-Sheng (曾浩生). Rotation of Bloch sphere induced by Lamb shift in open two-level systems[J]. Chin. Phys. B, 2015, 24(5): 50302-050302.

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Rotation of Bloch sphere induced by Lamb shift in open two-level systems

Rotation of Bloch sphere induced by Lamb shift in open two-level systems

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