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Chin. Phys. B, 2026, Vol. 35(8): 080303    DOI: 10.1088/1674-1056/ae85f7
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Bipartite and tripartite entanglement in the two-qubit quantum Rabi model

Lijun Mao(毛丽君)†, Hongmei Wang(王红梅), Yaoyao Zhou(周瑶瑶), and Hui Guo(郭慧)
Department of Physics, Taiyuan Normal University, Jinzhong 030619, China
Abstract  This study investigates the entanglement dynamics of the two-qubit quantum Rabi model (QRM) with both homogeneous and inhomogeneous couplings using the adiabatic approximation. The quantized field is initially prepared in a coherent state, while a separable state and a maximally entangled Bell state are selected as the initial two-qubit states. We characterize distinct types of entanglement generated among the subsystems through qubit-field interactions, with a focus on the bipartite entanglement between a single qubit and the field. Building on this, we examine tripartite correlations through the I-residual tangle, a measure that conclusively verifies the presence of genuine tripartite entanglement among the two qubits and the field. This work provides insights into the generation of tunable multipartite entanglement and the detection of quantum phase transitions in light-matter systems, such as circuit quantum electrodynamics (QED).
Keywords:  I-residual tangle      tripartite entanglement      bipartite entanglement      two-qubit QRM  
Received:  24 February 2026      Revised:  16 May 2026      Accepted manuscript online:  03 July 2026
PACS:  03.65.Ud (Entanglement and quantum nonlocality)  
  42.50.Pq (Cavity quantum electrodynamics; micromasers)  
  42.50.Md (Optical transient phenomena: quantum beats, photon echo, free-induction decay, dephasings and revivals, optical nutation, and self-induced transparency)  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11847111 and 11804246), the Scientific and Technological Innovation Program of Higher Education Institutions in Shanxi, China (Grant Nos. 2019L0822 and 2022L409), and the Natural Science Foundation of Shanxi Province, China (Grant No. 202203021221214).
Corresponding Authors:  Lijun Mao     E-mail:  maolijun516@163.com

Cite this article: 

Lijun Mao(毛丽君), Hongmei Wang(王红梅), Yaoyao Zhou(周瑶瑶), and Hui Guo(郭慧) Bipartite and tripartite entanglement in the two-qubit quantum Rabi model 2026 Chin. Phys. B 35 080303

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