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ROBERTO GRIMAUDO

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

  • Autori: Grimaudo, R; de Castro, A S Magalhães; Messina, A; Solano, E; Valenti, D
  • Anno di pubblicazione: 2023
  • Tipologia: Articolo in rivista
  • OA Link: http://hdl.handle.net/10447/582793

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.