Influence of homodyne-based feedback control on the entropic uncertainty in open quantum system

doi:10.1088/1674-1056/28/7/070303

中国物理B ›› 2019, Vol. 28 ›› Issue (7): 70303-070303.doi: 10.1088/1674-1056/28/7/070303

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

Influence of homodyne-based feedback control on the entropic uncertainty in open quantum system

Juju Hu(胡菊菊), Qin Xue(薛琴)

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:2019-03-21 修回日期:2019-05-14 出版日期:2019-07-05 发布日期:2019-07-05
通讯作者: Juju Hu E-mail:hjj2006@jxnu.edu.cn,jxnuhjj@126.com
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 61663016 and 11404150).

Influence of homodyne-based feedback control on the entropic uncertainty in open quantum system

Juju Hu(胡菊菊)^1,2, Qin Xue(薛琴)^1,2

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:2019-03-21 Revised:2019-05-14 Online:2019-07-05 Published:2019-07-05
Contact: Juju Hu E-mail:hjj2006@jxnu.edu.cn,jxnuhjj@126.com
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 61663016 and 11404150).

摘要/Abstract

摘要：

For an open quantum system containing two qubits under homodyne-based feedback control, we investigate the dynamical behaviors of quantum-memory-assisted entropic uncertainty. Moreover, we analyze the influence of feedback modes and coefficients on the entropic uncertainty. Numerical investigations show that the memory qubit should be placed in a non-dissipative channel if the single dissipative channel condition can be chosen, which helps reduce the entropic uncertainty of the system. For the homodyne feedback control F=λσ_x (or F=λσ_y), due to different roles of the entangled qubits A and B, when they are subject to feedback control with different feedback coefficients λ, the exchange of feedback coefficients will cause variations of the entropic uncertainty. When the feedback coefficient corresponding to the memory qubit B is larger (λ_B>λ_A), the steady value of the entropic uncertainty will be small, which is conducive to enhancing the robustness of the system. However, for the feedback control F=λσ_z, the difference between the feedback coefficients has no effect on the steady values of the entropic uncertainty.

关键词: homodyne-based feedback control, quantum-memory-assisted entropic uncertainties, memory qubit, open quantum system

Abstract:

Key words: homodyne-based feedback control, quantum-memory-assisted entropic uncertainties, memory qubit, 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)

胡菊菊, 薛琴. Influence of homodyne-based feedback control on the entropic uncertainty in open quantum system[J]. 中国物理B, 2019, 28(7): 70303-070303.

Juju Hu(胡菊菊), Qin Xue(薛琴). Influence of homodyne-based feedback control on the entropic uncertainty in open quantum system[J]. Chin. Phys. B, 2019, 28(7): 70303-070303.

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Influence of homodyne-based feedback control on the entropic uncertainty in open quantum system

Influence of homodyne-based feedback control on the entropic uncertainty in open quantum system

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