# Vacuum Induced Coherence in Cavity Quantum Electrodynamics

## TL;DR

This paper investigates vacuum-induced coherence effects in a three-level cavity QED system, demonstrating population trapping, controllability via external fields, and the potential to suppress radiative decay of Rabi oscillations.

## Contribution

It introduces a new analytical basis for understanding vacuum-induced coherence in strongly coupled cavity systems and explores control mechanisms using external fields.

## Key findings

- Population trapping due to vacuum-induced coherence.
- Control of coherence with external field parameters.
- Suppression of radiative decay in asymmetric pumping regimes.

## Abstract

Vacuum induced coherence in a strongly coupled cavity consisting of a three-level system is studied theoretically. The effects of the strong coupling to electromagnetic field vacuum are examined by solution of an open-system quantum master equation. The numerical results show that the system exhibits population trapping, and the numerical results are interpreted with analytical expressions derived from a new basis in the weak excitation regime. We further show that the generated effects can be probed with weak external fields. Moreover, it is shown that the induced coherence can be controlled by the applied field parameters like field detuning. Finally, we study the trapping dynamics in the strong field excitation regime, and also demonstrate that a recently proposed asymmetric pumping regime (limited to the weak coupling regime) can remove the radiative decay of coherent Rabi oscillations, with both weak and strong excitation fields.