Quantum discord of two-qutrit system under quantum-jump-based feedback control

doi:10.1088/1674-1056/ab4e83

中国物理B ›› 2019, Vol. 28 ›› Issue (12): 120302-120302.doi: 10.1088/1674-1056/ab4e83

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

Quantum discord of two-qutrit system under quantum-jump-based feedback control

Chang Wang(王畅), Mao-Fa Fang(方卯发)

Synergetic Innovation Center for Quantum Effects and Application, Key Laboratory of Low-dimensional Quantum Structures and Quantum Control of Ministry of Education, School of Physics and Electronics, Hunan Normal University, Changsha 410081, China

收稿日期:2019-08-10 修回日期:2019-09-21 出版日期:2019-12-05 发布日期:2019-12-05
通讯作者: Mao-Fa Fang E-mail:mffang@hunnu.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 11374096).

Quantum discord of two-qutrit system under quantum-jump-based feedback control

Chang Wang(王畅), Mao-Fa Fang(方卯发)

Synergetic Innovation Center for Quantum Effects and Application, Key Laboratory of Low-dimensional Quantum Structures and Quantum Control of Ministry of Education, School of Physics and Electronics, Hunan Normal University, Changsha 410081, China

Received:2019-08-10 Revised:2019-09-21 Online:2019-12-05 Published:2019-12-05
Contact: Mao-Fa Fang E-mail:mffang@hunnu.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 11374096).

摘要/Abstract

摘要： This paper studies quantum discord of two qutrits coupled to their own environments independently and coupled to the same environment simultaneously under quantum-jump-based feedback control. Our results show that spontaneous emission, quantum feedback parameters, classical driving, initial state, and detection efficiency all affect the evolution of quantum discord in a two-qutrit system. We find that under the condition of designing proper quantum-jump-based feedback parameters, quantum discord can be protected and prepared. In the case where two qutrits are independently coupled to their own environments, classical driving, spontaneous emission, and low detection efficiency have negative effect on the protection of quantum discord. For different initial states, it is found that the evolution of quantum discord under the control of appropriate parameters is similar. In the case where two qutrits are simultaneously coupled to the same environment, the classical driving plays a positive role in the generation of quantum discord, but spontaneous emission and low detection efficiency have negative impact on the generation of quantum discord. Most importantly, we find that the steady discord depends on feedback parameters, classical driving, and detection efficiency, but not on the initial state.

关键词: qutrit, quantum-jump-based feedback, quantum discord

Abstract: This paper studies quantum discord of two qutrits coupled to their own environments independently and coupled to the same environment simultaneously under quantum-jump-based feedback control. Our results show that spontaneous emission, quantum feedback parameters, classical driving, initial state, and detection efficiency all affect the evolution of quantum discord in a two-qutrit system. We find that under the condition of designing proper quantum-jump-based feedback parameters, quantum discord can be protected and prepared. In the case where two qutrits are independently coupled to their own environments, classical driving, spontaneous emission, and low detection efficiency have negative effect on the protection of quantum discord. For different initial states, it is found that the evolution of quantum discord under the control of appropriate parameters is similar. In the case where two qutrits are simultaneously coupled to the same environment, the classical driving plays a positive role in the generation of quantum discord, but spontaneous emission and low detection efficiency have negative impact on the generation of quantum discord. Most importantly, we find that the steady discord depends on feedback parameters, classical driving, and detection efficiency, but not on the initial state.

Key words: qutrit, quantum-jump-based feedback, quantum discord

中图分类号: (Quantum information)

03.67.-a

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

王畅, 方卯发. Quantum discord of two-qutrit system under quantum-jump-based feedback control[J]. 中国物理B, 2019, 28(12): 120302-120302.

Chang Wang(王畅), Mao-Fa Fang(方卯发). Quantum discord of two-qutrit system under quantum-jump-based feedback control[J]. Chin. Phys. B, 2019, 28(12): 120302-120302.

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Quantum discord of two-qutrit system under quantum-jump-based feedback control

Quantum discord of two-qutrit system under quantum-jump-based feedback control

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