Robust quantum correlations in out-of-equilibrium matter-light systems

TL;DR

This paper demonstrates that out-of-equilibrium dynamics in the Dicke model can produce two stages of enhanced quantum correlations, with potential applications in quantum information and metrology.

Contribution

It reveals two novel stages of quantum correlation enhancement in out-of-equilibrium light-matter systems, extending beyond traditional quench schemes.

Findings

Magnification of entanglement and squeezing due to non-linear interactions

Generation of highly entangled light-matter states with superradiance

Effects scale with system size and are robust in dissipative environments

Abstract

High precision macroscopic quantum control in interacting light-matter systems remains a significant goal toward novel information processing and ultra-precise metrology. We show that the out-of-equilibrium behavior of a paradigmatic light-matter system (Dicke model) reveals two successive stages of enhanced quantum correlations beyond the traditional schemes of near-adiabatic and sudden quenches. The first stage features magnification of matter-only and light-only entanglement and squeezing due to effective non-linear self-interactions. The second stage results from a highly entangled light-matter state, with enhanced superradiance and signatures of chaotic and highly quantum states. We show that these new effects scale up consistently with matter system size, and are reliable even in dissipative environments.