Dynamical quantum phase transitions in the dissipative Lipkin-Meshkov-Glick model and proposed realization in optical cavity QED

TL;DR

This paper proposes an optical cavity QED setup to realize a dissipative Lipkin-Meshkov-Glick model, revealing non-equilibrium quantum phase transitions with observable signatures in emitted light and entanglement.

Contribution

It introduces a novel experimental realization of a dissipative LMG model in cavity QED and characterizes its non-equilibrium phase transitions.

Findings

Observation of first- and second-order phase transitions

Measurable signatures in emitted light

Detection of spin-spin entanglement

Abstract

We present an optical cavity QED configuration that is described by a dissipative version of the Lipkin-Meshkov-Glick model of an infinitely coordinated spin system. This open quantum system exhibits both first- and second-order non-equilibrium quantum phase transitions as a single, effective field parameter is varied. Light emitted from the cavity offers measurable signatures of the critical behavior, including that of the spin-spin entanglement.