Squeezed light and correlated photons from dissipatively coupled optomechanical systems

TL;DR

This paper theoretically investigates how dissipative optomechanical coupling can produce strong squeezing and nonclassical photon correlations in output light, even in the resolved-sideband limit, revealing new quantum control possibilities.

Contribution

It introduces a theoretical analysis of squeezing and photon correlations in dissipatively coupled optomechanical systems, highlighting differences from dispersive coupling and enabling quantum effects in new regimes.

Findings

Strong squeezing at normal-mode frequencies

Squeezing occurs in the resolved-sideband limit with sideband cooling

Photon correlations can be below shot-noise at finite times

Abstract

We study theoretically the squeezing spectrum and second-order correlation function of the output light for an optomechanical system in which a mechanical oscillator modulates the cavity linewidth (dissipative coupling). We find strong squeezing coinciding with the normal-mode frequencies of the linearized system. In contrast to dispersive coupling, squeezing is possible in the resolved-sideband limit simultaneously with sideband cooling. The second-order correlation function shows damped oscillations, whose properties are given by the mechanical-like, the optical-like normal mode, or both, and can be below shot-noise level at finite times, $g^{(2)} (\tau) < 1$.