中国物理B ›› 2023, Vol. 32 ›› Issue (7): 70303-070303.doi: 10.1088/1674-1056/acb9f0

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First-order quantum phase transition and entanglement in the Jaynes-Cummings model with a squeezed light

Chun-Qi Tang(汤椿琦) and Li-Tuo Shen(沈利托)   

  1. Fujian Key Laboratory of Quantum Information and Quantum Optics, College of Physics and Information Engineering, Fuzhou University, Fuzhou 350116, China
  • 收稿日期:2022-12-13 修回日期:2023-01-27 接受日期:2023-02-08 出版日期:2023-06-15 发布日期:2023-06-29
  • 通讯作者: Li-Tuo Shen E-mail:lituoshen@yeah.net
  • 基金资助:
    Project supported by the Natural Science Foundation of Fujian Province, China (Grant No. 2021J01574).

First-order quantum phase transition and entanglement in the Jaynes-Cummings model with a squeezed light

Chun-Qi Tang(汤椿琦) and Li-Tuo Shen(沈利托)   

  1. Fujian Key Laboratory of Quantum Information and Quantum Optics, College of Physics and Information Engineering, Fuzhou University, Fuzhou 350116, China
  • Received:2022-12-13 Revised:2023-01-27 Accepted:2023-02-08 Online:2023-06-15 Published:2023-06-29
  • Contact: Li-Tuo Shen E-mail:lituoshen@yeah.net
  • Supported by:
    Project supported by the Natural Science Foundation of Fujian Province, China (Grant No. 2021J01574).

摘要: We study the quantum phase transition and entanglement in the Jaynes-Cummings model with squeezed light, utilize a special transformation method to obtain the analytical ground state of the model within the near-resonance regime, and numerically verify the validity of the analytical ground state. It is found that the ground state exhibits a first-order quantum phase transition at the critical point linearly induced by squeezed light, and the ground state entanglement reaches its maximum when the qubit-field coupling strength is large enough at the critical point.

关键词: Jaynes-Cummings model, quantum phase transition, entanglement

Abstract: We study the quantum phase transition and entanglement in the Jaynes-Cummings model with squeezed light, utilize a special transformation method to obtain the analytical ground state of the model within the near-resonance regime, and numerically verify the validity of the analytical ground state. It is found that the ground state exhibits a first-order quantum phase transition at the critical point linearly induced by squeezed light, and the ground state entanglement reaches its maximum when the qubit-field coupling strength is large enough at the critical point.

Key words: Jaynes-Cummings model, quantum phase transition, entanglement

中图分类号:  (Entanglement and quantum nonlocality)

  • 03.65.Ud
11.10.-z (Field theory) 11.10.Ef (Lagrangian and Hamiltonian approach)