Implication of giant photon bunching on quantum phase transition in the dissipative anisotropic quantum Rabi model

Abstract

We investigate quantum phase transition in the dissipative anisotropic quantum Rabi model in the framework of quantum dressed master equation. From perspectives of both numerical and analytical analysis, we unravel the implication of the giant photon-bunching behavior on the first-order quantum phase transition. The observed two-photon statistics can be well described analytically within a few lowest eigenstates at the low temperature. Moreover, such significant photon-bunching feature is generally exhibited at the deep-strong qubit–photon coupling, which is however lacking in the dissipative isotropic quantum Rabi model. Therefore, we suggest that the photon-bunching measurement is helpful to characterize quantum phase transition of the qubit–photon hybrid systems.