Journal
PHYSICAL REVIEW LETTERS
Volume 130, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.130.043602
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This study investigates a two-interacting-qubit quantum Rabi-like model with vanishing transverse fields on the qubit pair. Regardless of the coupling regime, this model can be exactly and unitarily reduced to two independent single-spin quantum Rabi models, where the spin-spin coupling acts as the transverse field. This transformation and the analytical treatment of the single-spin quantum Rabi model are crucial in proving the integrability of our model. The study reveals the existence of different first-order quantum phase transitions characterized by discontinuous two-spin magnetization, mean photon number, and concurrence.
A two-interacting-qubit quantum Rabi-like model with vanishing transverse fields on the qubit pair is studied. Independently of the coupling regime, this model can be exactly and unitarily reduced to two independent single-spin quantum Rabi models, where the spin-spin coupling plays the role of the transverse field. This transformation and the analytical treatment of the single-spin quantum Rabi model provide the key to prove the integrability of our model. The existence of different first-order quantum phase transitions, characterized by discontinuous two-spin magnetization, mean photon number, and concurrence, is brought to light.
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