Open quantum many-body system; Dissipative quantum phase transition; Lipkin-Meshkov-Glick model; Qudits; Cavity QED
Abstract :
[en] The dissipative Lipkin-Meshkov-Glick model of N all-to-all interacting two-level systems subject to collective and/or individual decay is known to display a dissipative phase transition. There, the collective or individual nature of the dissipation defines the order of the phase transition and the characteristics of the different phases, while having no impact on the position of the critical point.
Here, we investigate a generalization of this model to d-level spins (d ≥ 2). While basic features of the transition, such as the critical point, remain identical to the two-level case, the spin expectation values that characterize the different phases become ever more distinct from each other as d increases. Furthermore, depending on the exact form of the dissipator, the critical point transforms into a critical region that grows with d. Around the phase transition, the steady state of the system is entangled, and different choices of the dissipator may lead to a suppression or even an enhancement of entanglement by the individual dissipation.
Disciplines :
Physics
Author, co-author :
Pausch, Lukas ; Université de Liège - ULiège > Complex and Entangled Systems from Atoms to Materials (CESAM)
Damanet, François ; Université de Liège - ULiège > Complex and Entangled Systems from Atoms to Materials (CESAM)
Bastin, Thierry ; Université de Liège - ULiège > Département de physique > Spectroscopie atomique et Physique des atomes froids
Martin, John ; Université de Liège - ULiège > Département de physique
Language :
English
Title :
Dissipative quantum phase transition in an interacting many-particle system: from two-level to multilevel spins
Publication date :
14 March 2024
Event name :
DPG Spring Meeting of the Atomic, Molecular, Quantum Optics and Photonics Section
Event organizer :
German Physical Society (DPG)
Event place :
Freiburg, Germany
Event date :
from 10 to 15 March 2024
Audience :
International
Peer reviewed :
Editorial reviewed
Funders :
EOS - The Excellence Of Science Program FWO - Fonds Wetenschappelijk Onderzoek Vlaanderen F.R.S.-FNRS - Fonds de la Recherche Scientifique