文献类型：期刊文献

英文题名：Entanglement Dynamics of Electron Spins in Quantum Dots Under a Nonuniform Magnetic Field

作者：Zhou, Feng-Xue[1];Qi, Yi-Hong[1];Niu, Yue-Ping[1];Gong, Shang-Qing[1];Qian, Jun[2];Yu, Ting[3]

机构：[1]E China Univ Sci & Technol, Dept Phys, Shanghai 200237, Peoples R China;[2]Chinese Acad Sci, Shanghai Inst Opt & Fine Mech, Key Lab Quantum Opt, Shanghai 201800, Peoples R China;[3]Stevens Inst Technol, Dept Phys & Engn Phys, Ctr Controlled Quantum Syst, Hoboken, NJ 07030 USA

年份：2012

卷号：60

期号：8

起止页码：1238

外文期刊名：JOURNAL OF THE KOREAN PHYSICAL SOCIETY

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000304100200009)】；

基金：The research work reported in this paper was financially supported by the National Natural Science Foundation of China (Grant Nos. 10874194, 60978013, 60921004) and by the International Cooperation Program from Science and Technology Commission of Shanghai Municipality (Grand No. 10530704800). T.Y. also acknowledges grant support from the Defense Advanced Research Projects Agency Quantum Entanglement Science and Technology program HR0011-09-1-0008 and the NSF PHY-0925174.

语种：英文

外文关键词：Quantum entanglement; Decoherence; Concurrence; Quantum dot

摘要：We investigate entanglement of two coupled electron spins in quantum dots (QDs) in the presence of an inhomogeneous magnetic field. The important effects of the inhomogeneous field are discussed for the dynamics of entanglement. Due to the system's symmetry, the inhomogeneity of the field is shown not to affect the evolution of entanglement for Phi-type Bell state while it plays a key role for Psi-type Bell state. For the maximal entangled Bell states, the field is positive for the entanglement dynamics. The mean field can increase the entanglement revival for Phi-type Bell state while an inhomogeneous field can promote the entanglement revival for Psi-type Bell state. For the unentangled initial states, the field is destructive for the entanglement generation induced by the coupling of the two spins.