AUTHOR=Wang Ning , Gong Zhi-Rui , Lu Jing , Zhou Lan 

TITLE=Phases Transitions in a Cross-Cavity Quantum Rabi Model Possessing PT Symmetric Structure

JOURNAL=Frontiers in Physics

VOLUME=7

YEAR=2019

URL=https://www.frontiersin.org/journals/physics/articles/10.3389/fphy.2019.00127

DOI=10.3389/fphy.2019.00127

ISSN=2296-424X

ABSTRACT=<p>We investigated the quantum phase transitions in a cross-cavity quantum Rabi model which possesses the parity-time symmetric structure. Both the dissipative quantum Rabi phase transition and the spontaneous parity-time symmetry breaking exist simultaneously in such system. The competition between these two phase transitions produces the plentiful phase diagram. We also propose the detection of the dissipative cross-cavity quantum Rabi phase transition through the measurement of the parity-time symmetric or asymmetric states, which shed light on the precise detection of the few-body phase transition.</p>