Quantum optical feedback control for creating strong correlations in many-body systems

TL;DR

This paper demonstrates how quantum optical feedback can induce strong correlations in many-body systems, enabling the stabilization of complex quantum states like density waves and antiferromagnetic order, which are valuable for quantum technologies.

Contribution

It introduces a novel method of using quantum optical feedback to generate and stabilize correlated many-body states, bridging quantum optics and many-body physics.

Findings

Stable density wave states achieved

Antiferromagnetic states stabilized

Potential for applications in quantum technologies

Abstract

Light enables manipulating many-body states of matter, and atoms trapped in optical lattices is a prominent example. However, quantum properties of light are completely neglected in all quantum gas experiments. Extending methods of quantum optics to many-body physics will enable phenomena unobtainable in classical optical setups. We show how using the quantum optical feedback creates strong correlations in bosonic and fermionic systems. It balances two competing processes, originating from different fields: quantum backaction of weak optical measurement and many-body dynamics, resulting in stabilized density waves, antiferromagnetic and NOON states. Our approach is extendable to other systems promising for quantum technologies.