Quantum Fluctuation Dynamics of Dispersive Superradiant Pulses in a Hybrid Light-Matter System

TL;DR

This paper theoretically investigates the quantum fluctuation dynamics in a hybrid light-matter system exhibiting superradiant pulses, revealing how quantum fluctuations break time-reversal symmetry and enable control of complex quantum states for sensing applications.

Contribution

It introduces a quench protocol to sustain non-Gaussian states in a driven-dissipative quantum system, highlighting the role of quantum fluctuations in breaking symmetry and controlling fluctuations.

Findings

Quantum fluctuations break time-reversal symmetry in superradiant pulses.

A quench protocol maintains non-Gaussian states over long times.

Potential applications in quantum sensing and spin amplification.

Abstract

We consider theoretically a driven-dissipative quantum many-body system consisting of an atomic ensemble in a single-mode optical cavity as described by the open Tavis-Cummings model. In this hybrid light-matter system the interplay between coherent and dissipative processes leads to superradiant pulses with a build-up of strong correlations, even for systems comprising hundreds to thousands of particles. A central feature of the mean-field dynamics is a self-reversal of two spin degrees of freedom due to an underlying time-reversal symmetry, which is broken by quantum fluctuations. We demonstrate a quench protocol that can maintain highly non-Gaussian states over long time scales. This general mechanism offers interesting possibilities for the generation and control of complex fluctuation patterns, as suggested for the improvement of quantum sensing protocols for dissipative spin-amplification.