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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)† |
| Fujian Key Laboratory of Quantum Information and Quantum Optics, College of Physics and Information Engineering, Fuzhou University, Fuzhou 350116, China |
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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.
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Received: 13 December 2022
Revised: 27 January 2023
Accepted manuscript online: 08 February 2023
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PACS:
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03.65.Ud
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(Entanglement and quantum nonlocality)
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11.10.-z
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(Field theory)
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11.10.Ef
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(Lagrangian and Hamiltonian approach)
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| Fund: Project supported by the Natural Science Foundation of Fujian Province, China (Grant No. 2021J01574). |
Corresponding Authors:
Li-Tuo Shen
E-mail: lituoshen@yeah.net
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Cite this article:
Chun-Qi Tang(汤椿琦) and Li-Tuo Shen(沈利托) First-order quantum phase transition and entanglement in the Jaynes-Cummings model with a squeezed light 2023 Chin. Phys. B 32 070303
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