Quantum phase transitions for an integrable quantum Rabi-like model with two interacting qubits

• URL: http://arxiv.org/abs/2211.07207v1
• Date: Mon, 14 Nov 2022 08:51:54 GMT
• Title: Quantum phase transitions for an integrable quantum Rabi-like model with two interacting qubits
• Authors: Roberto Grimaudo, Antonio S. M. de Castro, Antonino Messina, Enrique Solano, and Davide Valenti
• Abstract summary: 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.
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• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: 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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