中国物理B ›› 2022, Vol. 31 ›› Issue (12): 120305-120305.doi: 10.1088/1674-1056/ac8af8

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Quantum steerability of two qubits mediated by one-dimensional plasmonic waveguides

Ye-Qi Zhang(张业奇)1, Xiao-Ting Ding(丁潇婷)1, Jiao Sun(孙娇)1, and Tian-Hu Wang(王天虎)2,†   

  1. 1 Department of Mathematics and Physics, North China Electric Power University, Beijing 102206, China;
    2 School of Energy Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China
  • 收稿日期:2022-06-28 修回日期:2022-08-01 接受日期:2022-08-19 出版日期:2022-11-11 发布日期:2022-11-19
  • 通讯作者: Tian-Hu Wang E-mail:thwang@ncepu.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 51876059 and 11805065) and the Fundamental Research Funds for the Central Universities (Grant Nos. 2021MS009 and 2021MS046).

Quantum steerability of two qubits mediated by one-dimensional plasmonic waveguides

Ye-Qi Zhang(张业奇)1, Xiao-Ting Ding(丁潇婷)1, Jiao Sun(孙娇)1, and Tian-Hu Wang(王天虎)2,†   

  1. 1 Department of Mathematics and Physics, North China Electric Power University, Beijing 102206, China;
    2 School of Energy Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China
  • Received:2022-06-28 Revised:2022-08-01 Accepted:2022-08-19 Online:2022-11-11 Published:2022-11-19
  • Contact: Tian-Hu Wang E-mail:thwang@ncepu.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 51876059 and 11805065) and the Fundamental Research Funds for the Central Universities (Grant Nos. 2021MS009 and 2021MS046).

摘要: We study the dynamics of the quantum steering between two separated qubits trapped in a one-dimensional plasmonic waveguide. By numerical methods, we calculate the quantum steerability and other quantum correlations, i.e., entanglement, discord, and coherence, for both cases with and without laser driving fields. It is found that steerability may exhibit a sudden disappearance and sudden reappearance phenomenon. Specifically, there exist time windows with no steerability but finite entanglement. The effects of plasmon wavenumber and the distance between the two qubits on steerability are also examined. Furthermore, we show that quantum steerability is tunable by adjusting the laser driving fields.

关键词: quantum steering, quantum correlations, plasmonic waveguide

Abstract: We study the dynamics of the quantum steering between two separated qubits trapped in a one-dimensional plasmonic waveguide. By numerical methods, we calculate the quantum steerability and other quantum correlations, i.e., entanglement, discord, and coherence, for both cases with and without laser driving fields. It is found that steerability may exhibit a sudden disappearance and sudden reappearance phenomenon. Specifically, there exist time windows with no steerability but finite entanglement. The effects of plasmon wavenumber and the distance between the two qubits on steerability are also examined. Furthermore, we show that quantum steerability is tunable by adjusting the laser driving fields.

Key words: quantum steering, quantum correlations, plasmonic waveguide

中图分类号:  (Entanglement and quantum nonlocality)

  • 03.65.Ud
03.67.-a (Quantum information) 73.20.Mf (Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))