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DAVIDE VALENTI

Characterization of Quantum and Classical Critical Points for an Integrable Two-Qubit Spin-Boson Model

  • Autori: Grimaudo, R; Messina, A; Nakazato, H; Sergi, A; Valenti, D
  • Anno di pubblicazione: 2023
  • Tipologia: Articolo in rivista
  • Parole Chiave: open quantum systems; spin-boson model; interacting qubits; quantum phase transitions
  • OA Link: http://hdl.handle.net/10447/621235

Abstract

The class of two-interacting-qubit spin-boson models with vanishing transverse fields on the spin-pair is studied. The model can be mapped exactly into two independent standard single-impurity spin-boson models where the role of the tunneling parameter is played by the spin-spin coupling. The dynamics of the magnetization are analyzed for different levels of (an)isotropy. The existence of a decoherence-free subspace, as well as of different classical regimes separated by a critical temperature, and symptoms of quantum (first-order and Kosterlitz-Thouless type) phase transitions in the Ohmic regime are brought to light.