Superradiant Quantum Phase Transition for an Exactly Solvable Two-Qubit Spin-Boson Model-Reference-Cited by-同舟云学术

Superradiant Quantum Phase Transition for an Exactly Solvable Two-Qubit Spin-Boson Model

Published:2023-01-17 Issue:2 Volume:25 Page:187
ISSN:1099-4300
Container-title:Entropy
language:en
Short-container-title:Entropy

Author:

Grimaudo Roberto¹^ORCID,Valenti Davide¹^ORCID,Sergi Alessandro²³^ORCID,Messina Antonino⁴^ORCID

Affiliation:

1. Dipartimento di Fisica e Chimica “Emilio Segrè”, Group of Interdisciplinary Theoretical Physics, Università degli Studi di Palermo, Viale delle Scienze Ed. 18, 90128 Palermo, Italy

2. Dipartimento di Scienze Matematiche e Informatiche, Scienze Fisiche e Scienze della Terra, Università degli Studi di Messina, Viale F. Stagno d’Alcontres 31, 98166 Messina, Italy

3. Institute of Systems Science, Durban University of Technology, P.O. Box 1334, Durban 4000, South Africa

4. Dipartimento di Matematica ed Informatica, Università degli Studi di Palermo, Via Archirafi 34, 90123 Palermo, Italy

Abstract

A spin-boson-like model with two interacting qubits is analysed. The model turns out to be exactly solvable since it is characterized by the exchange symmetry between the two spins. The explicit expressions of eigenstates and eigenenergies make it possible to analytically unveil the occurrence of first-order quantum phase transitions. The latter are physically relevant since they are characterized by abrupt changes in the two-spin subsystem concurrence, in the net spin magnetization and in the mean photon number.

Funder

PRIN Project

Publisher

MDPI AG

Subject

General Physics and Astronomy

Link

https://www.mdpi.com/1099-4300/25/2/187/pdf

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