Noise reduction via optimal control in a light-matter quantum system

TL;DR

This paper introduces an optimal control method using Gaussian pulses to significantly reduce quantum noise below the shot noise limit in a light-matter system modeled by Jaynes-Cummings, enhancing quantum squeezing.

Contribution

It presents a novel optimal control protocol with Gaussian pulses to improve transient noise reduction in a Jaynes-Cummings system, achieving over 80% noise suppression.

Findings

Noise reduced below shot noise by over 80%

Optimal pulse timing enhances squeezing in light-matter systems

Feasible with current experimental technology

Abstract

Quantum noise reduction below the shot noise limit is a signature of light-matter quantum interaction. A limited amount of squeezing can be obtained along the transient evolution of a two-level system resonantly interacting with a harmonic mode. We propose the use of optimal quantum control over the two-level system to enhance the transient noise reduction in the harmonic mode in a system described by the Jaynes-Cummings model. Specifically, we propose the use of a sequence of Gaussian pulses in a given time window. We find that the correct choice of pulse times can reduce the noise in the quadrature field mode well below the shot noise, reaching reductions of over 80$\%$. As the Jaynes-Cummings model describes a pivotal light-matter quantum system, our approach for noise reduction provides an experimentally feasible protocol to produce a non-trivial amount of squeezing with current technology.