›› 2015, Vol. 24 ›› Issue (4): 44205-044205.doi: 10.1088/1674-1056/24/4/044205

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇    下一篇

Optimizing quantum correlation dynamics by weak measurement in dissipative environment

杜少将a b, 夏云杰a, 段德洋a, 张路a, 高强a   

  1. a Shandong Provincial Key Laboratory of Laser Polarization and Information Technology, Department of Physics, Qufu Normal University, Qufu 273165, China;
    b Department of Physics and Information Engineering, Jining University, Qufu 273155, China
  • 收稿日期:2014-09-22 修回日期:2014-10-15 出版日期:2015-04-05 发布日期:2015-04-05
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 61178012 and No.11147019).

Optimizing quantum correlation dynamics by weak measurement in dissipative environment

Du Shao-Jiang (杜少将)a b, Xia Yun-Jie (夏云杰)a, Duan De-Yang (段德洋)a, Zhang Lu (张路)a, Gao Qiang (高强)a   

  1. a Shandong Provincial Key Laboratory of Laser Polarization and Information Technology, Department of Physics, Qufu Normal University, Qufu 273165, China;
    b Department of Physics and Information Engineering, Jining University, Qufu 273155, China
  • Received:2014-09-22 Revised:2014-10-15 Online:2015-04-05 Published:2015-04-05
  • Contact: Xia Yun-Jie E-mail:yjxia_sd@126.com
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 61178012 and No.11147019).

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摘要： We investigate the protection of quantum correlations of two qubits in independent vacuum reservoirs by means of weak measurements. It is found that the weak measurement can reduce the amount of quantum correlation for one type of initial state at the beginning in a non-Markovian environment and meanwhile it can reduce the occurrence time of entanglement sudden death (ESD) in the process of time evolution. In a Markovian environment, the quantum entanglements of the two kinds of initial states decay rapidly and the weak measurement can further weaken the quantum entanglement, therefore in this case the entanglement cannot be optimized in the evolution process.

关键词: quantum entanglement, quantum correlation, entanglement sudden death, weak measurement

Abstract: We investigate the protection of quantum correlations of two qubits in independent vacuum reservoirs by means of weak measurements. It is found that the weak measurement can reduce the amount of quantum correlation for one type of initial state at the beginning in a non-Markovian environment and meanwhile it can reduce the occurrence time of entanglement sudden death (ESD) in the process of time evolution. In a Markovian environment, the quantum entanglements of the two kinds of initial states decay rapidly and the weak measurement can further weaken the quantum entanglement, therefore in this case the entanglement cannot be optimized in the evolution process.

Key words: quantum entanglement, quantum correlation, entanglement sudden death, weak measurement

中图分类号:  (Quantum state engineering and measurements)

  • 42.50.Dv
42.50.Nn (Quantum optical phenomena in absorbing, amplifying, dispersive and conducting media; cooperative phenomena in quantum optical systems) 42.50.Pq (Cavity quantum electrodynamics; micromasers) 42.50.Wk (Mechanical effects of light on material media, microstructures and particles)