Squeezed superradiant lasing of a quantum many-body emitter

TL;DR

This paper introduces the concept of quantum many-body lasers where interacting emitters coherently radiate, demonstrating how many-body interactions can induce squeezing transferred to photons, advancing quantum light sources.

Contribution

It presents a novel concept of quantum many-body lasers with coherent emitter interactions, showing how squeezing can be transferred to emitted photons via superradiance.

Findings

Coherent many-body interactions induce squeezing in the system.

Squeezing can be transferred from spins to photons.

The system generates quantum-correlated bright light.

Abstract

In conventional lasers, the emitters are typically incoherent, radiating photons independently; in superradiant lasers, many coherent emitters radiate photons collectively, but they essentially do not interact with each other. Here, we present the concept of quantum many-body lasers, in which the emitters interact coherently and radiate collectively. In this proof-of-concept study, we consider a cavity coupled to many pumped spin-1/2 emitters with all-to-all interaction. We find that the squeezing induced by the coherent many-body interaction can be transferred from the spins to photons through superradiant lasing. This work illustrates the concept of using a pumped quantum many-body system to generate bright quantum light with quantum correlations beyond conventional optical coherence, which can facilitate quantum technologies and the study of nonlinear optics in the quantum realm.