中国物理B ›› 2018, Vol. 27 ›› Issue (10): 100302-100302.doi: 10.1088/1674-1056/27/10/100302

• SPECIAL TOPIC—Recent advances in thermoelectric materials and devices • 上一篇    下一篇

Controlling of entropic uncertainty in open quantum system via proper placement of quantum register

Ying-Hua Ji(嵇英华), Qiang Ke(柯强), Ju-Ju Hu(胡菊菊)   

  1. 1 College of Physics and Communication Electronics, Jiangxi Normal University, Nanchang 330022, China;
    2 Key Laboratory of Photoelectronics and Telecommunication of Jiangxi Province, Nanchang 330022, China
  • 收稿日期:2018-05-28 修回日期:2018-07-19 出版日期:2018-10-05 发布日期:2018-10-05
  • 通讯作者: Ju-Ju Hu E-mail:jyh2006@jxnu.edu.cn
  • 基金资助:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 11264015 and 11404150).

Controlling of entropic uncertainty in open quantum system via proper placement of quantum register

Ying-Hua Ji(嵇英华)1,2, Qiang Ke(柯强)1,2, Ju-Ju Hu(胡菊菊)1,2   

  1. 1 College of Physics and Communication Electronics, Jiangxi Normal University, Nanchang 330022, China;
    2 Key Laboratory of Photoelectronics and Telecommunication of Jiangxi Province, Nanchang 330022, China
  • Received:2018-05-28 Revised:2018-07-19 Online:2018-10-05 Published:2018-10-05
  • Contact: Ju-Ju Hu E-mail:jyh2006@jxnu.edu.cn
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 11264015 and 11404150).

摘要:

We investigate the dynamical behaviors of quantum-memory-assisted entropic uncertainty and its lower bound in the amplitude-damping channel. The influences of different placement positions of the quantum register on the dynamics of quantum coherence, quantum entanglement, and quantum discord are analyzed in detail. The numerical simulation results show that the quantum register should be placed in the channel of the non-Markovian effect. This option is beneficial to reduce the entropic uncertainty and its lower bound. We also find that this choice does not change the evolution of the quantum coherence and quantum entanglement, but changes the dynamical process of the quantum discord of the system. These results show that quantum coherence, quantum entanglement, and quantum discord are different quantum resources with unique characteristics and properties, and quantum discord can play a key role in reducing the uncertainty of quantum systems.

关键词: quantum-memory-assisted, entropic uncertainties, quantum register, open quantum system

Abstract:

We investigate the dynamical behaviors of quantum-memory-assisted entropic uncertainty and its lower bound in the amplitude-damping channel. The influences of different placement positions of the quantum register on the dynamics of quantum coherence, quantum entanglement, and quantum discord are analyzed in detail. The numerical simulation results show that the quantum register should be placed in the channel of the non-Markovian effect. This option is beneficial to reduce the entropic uncertainty and its lower bound. We also find that this choice does not change the evolution of the quantum coherence and quantum entanglement, but changes the dynamical process of the quantum discord of the system. These results show that quantum coherence, quantum entanglement, and quantum discord are different quantum resources with unique characteristics and properties, and quantum discord can play a key role in reducing the uncertainty of quantum systems.

Key words: quantum-memory-assisted, entropic uncertainties, quantum register, open quantum system

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

  • 03.65.Ta
05.40.Ca (Noise) 03.65.Yz (Decoherence; open systems; quantum statistical methods)