Explanation of the intriguing quantum phenomenon of the off-resonant cavity mode emission

TL;DR

This paper provides a theoretical explanation for the unexpected off-resonant cavity mode emission in quantum electrodynamics systems, revealing a phonon-induced dynamical phase transition and aligning with experimental observations.

Contribution

It introduces a theoretical model that explains the origin of off-resonant emission peaks and the role of phonon-mediated coupling in cavity QED systems.

Findings

The central peak arises due to a phonon-mediated dynamical phase transition.

The theoretical results match previous experimental observations.

The study clarifies the fundamental physics of off-resonant cavity emission.

Abstract

We theoretically investigate the unexpected occurrence of an extra emission peak that has been experimentally observed in off-resonant studies of cavity QED systems. Our results within the Markovian master equation approach successfully explain why the central peak arises, and how it reveals that the system is suffering a dynamical phase transition induced by the phonon-mediated coupling. Our findings are in perfect agreement with previous reported experimental results and for the first time the fundamental physics behind this quantum phenomenon is understood.