Quantum dynamics of a two-level emitter with modulated transition frequency

TL;DR

This paper explores how modulating the transition frequency of a two-level emitter affects its quantum dynamics, enabling control over spontaneous emission and frequency shifts through quantum interference effects.

Contribution

It introduces a method to control quantum emission properties by classical modulation of the emitter's transition frequency, revealing new avenues for quantum coherence manipulation.

Findings

Quantum interference effects can be induced via frequency modulation.

Spontaneous emission rates can be controlled by modulation parameters.

Frequency shifts of the emitter are tunable through modulation depth and phase.

Abstract

The resonant quantum dynamics of an excited two-level emitter is investigated via classical modulation of its transition frequency while simultaneously the radiator interacts with a broadband electromagnetic field reservoir. The frequency of modulation is selected to be of the order of the bare-state spontaneous decay rate. In this way, one can induce quantum interference effects and, consequently, quantum coherences among multiple decaying transition pathways. Depending on the modulation depth and its absolute phase, both the spontaneous emission and the frequency shift may be conveniently modified and controlled.