中国物理B ›› 2018, Vol. 27 ›› Issue (12): 120304-120304.doi: 10.1088/1674-1056/27/12/120304

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

Quantum steering in Heisenberg models with Dzyaloshinskii-Moriya interactions

Hui-Zhen Li(李慧贞), Rong-Sheng Han(韩榕生), Ye-Qi Zhang(张业奇), Liang Chen(陈亮)   

  1. Mathematics and Physics Department, North China Electric Power University, Beijing 102206, China
  • 收稿日期:2018-07-15 修回日期:2018-09-09 出版日期:2018-12-05 发布日期:2018-12-05
  • 通讯作者: Liang Chen E-mail:slchern@ncepu.edu.cn
  • 基金资助:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 11504106, 11805065, 11247308, and 11447167) and the Fundamental Research Funds for the Central Universities, China (Grant Nos. 2018MS049 and 2018MS056).

Quantum steering in Heisenberg models with Dzyaloshinskii-Moriya interactions

Hui-Zhen Li(李慧贞), Rong-Sheng Han(韩榕生), Ye-Qi Zhang(张业奇), Liang Chen(陈亮)   

  1. Mathematics and Physics Department, North China Electric Power University, Beijing 102206, China
  • Received:2018-07-15 Revised:2018-09-09 Online:2018-12-05 Published:2018-12-05
  • Contact: Liang Chen E-mail:slchern@ncepu.edu.cn
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 11504106, 11805065, 11247308, and 11447167) and the Fundamental Research Funds for the Central Universities, China (Grant Nos. 2018MS049 and 2018MS056).

摘要:

In this work, we study the quantum steering in two-qubit Heisenberg models with Dzyaloshinskii-Moriya (DM) interaction and an external magnetic field. We find that the steerable weight (SW) and the critical temperature where SW→0 can be enhanced by the DM interactions. In the special case where the magnetic field is vanishing and the two spins are ferromagnetically coupled, the DM interaction can tune the zero-temperature SW from zero to a finite value. In addition to the SW, some other measurements used to identify the quantum entanglement and quantum correlations are investigated, i.e., the concurrence, the quantum discord, and the robustness of coherence. In the strong magnetic field limit, our results show that the SW is dramatically different from the other measurements.

关键词: quantum steering, Heisenberg model, Dzyaloshinskii-Moriya interaction

Abstract:

In this work, we study the quantum steering in two-qubit Heisenberg models with Dzyaloshinskii-Moriya (DM) interaction and an external magnetic field. We find that the steerable weight (SW) and the critical temperature where SW→0 can be enhanced by the DM interactions. In the special case where the magnetic field is vanishing and the two spins are ferromagnetically coupled, the DM interaction can tune the zero-temperature SW from zero to a finite value. In addition to the SW, some other measurements used to identify the quantum entanglement and quantum correlations are investigated, i.e., the concurrence, the quantum discord, and the robustness of coherence. In the strong magnetic field limit, our results show that the SW is dramatically different from the other measurements.

Key words: quantum steering, Heisenberg model, Dzyaloshinskii-Moriya interaction

中图分类号:  (Quantum information)

  • 03.67.-a
03.65.Ud (Entanglement and quantum nonlocality) 75.10.Jm (Quantized spin models, including quantum spin frustration) 75.10.Pq (Spin chain models)