Non-Markovian transient spectroscopy in cavity QED

TL;DR

This paper presents a theoretical framework for using transient field measurements in cavity QED to analyze non-Markovian dynamics and quantum noise, enhancing spectral resolution and noise spectroscopy capabilities.

Contribution

It introduces a formalism combining transient spectroscopy with dynamical decoupling to reveal non-Markovian effects and quantum noise signatures in cavity QED.

Findings

Transient spectroscopy can recover spectral features obscured in stationary spectra.

Dynamical decoupling enhances detection of non-Markovian dynamics.

Quantum noise signatures from non-commuting observables are identified.

Abstract

We theoretically analyze measurements of the transient field leaving a cavity as a tool for studying non-Markovian dynamics in cavity quantum electrodynamics (QED). Combined with a dynamical decoupling pulse sequence, transient spectroscopy can be used to recover spectral features that may be obscured in the stationary cavity transmission spectrum due to inhomogeneous broadening. The formalism introduced here can be leveraged to perform in situ noise spectroscopy, revealing a robust signature of quantum noise arising from non-commuting observables, a purely quantum effect.