Quantum Phase Transitions for an Integrable Quantum Rabi-like Model with Two Interacting Qubits

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...

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Bibliographic Details
Published in:Physical review letters 2023-01, Vol.130 (4), p.043602-043602, Article 043602
Main Authors: Grimaudo, R, de Castro, A S Magalhães, Messina, A, Solano, E, Valenti, D
Format: Article
Language:English
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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, 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.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.130.043602