Atom-assisted quadrature squeezing of a mechanical oscillator inside a dispersive cavity

TL;DR

This paper proposes a hybrid optomechanical scheme using an atom in a Λ configuration inside a dispersive cavity to achieve controllable, robust quadrature squeezing of a mechanical oscillator beyond the 3 dB limit, unaffected by cavity decay or atomic spontaneous emission.

Contribution

It introduces a novel atom-assisted method for dynamical quadrature squeezing in optomechanics, demonstrating enhanced squeezing control and robustness against decoherence effects.

Findings

Achieves squeezing beyond 3 dB limit unaffected by cavity decay.

Demonstrates control of squeezing via atomic state preparation.

Analyzes the impact of thermal baths on squeezing spectrum.

Abstract

We present a hybrid optomechanical scheme to achieve dynamical squeezing of position quadrature of a mesoscopic mechanical oscillator, that can be externally controlled by classical fields. A membrane-in-the-middle set up is employed, in which an atom in $\Lambda$ configuration is considered to be trapped on either side of the membrane inside the cavity. We show that a considerable amount of squeezing (beyond the 3 dB limit) can be achieved that is not affected by the decay of the cavity and the spontaneous emission of the atom. Squeezing depends upon the initial preparation of atomic states. Further, a strong effective coupling between the atom and the oscillator can be attained by using large control fields that pump the atom and the cavity. Effect of thermal phononic bath on squeezing is studied in terms of the squeezing spectrum. The results are supported by the detailed analytical calculations.