Entangling the motion of two optically trapped objects via time-modulated driving fields

TL;DR

This paper demonstrates how to generate and detect entanglement between two optically trapped microdisks' motional states using time-modulated driving fields, with potential applications in quantum information processing.

Contribution

It introduces a scheme for entangling two tethered microdisks' motions via parametric coupling with time-modulated lasers, leveraging linear and quadratic optomechanical interactions.

Findings

Entanglement can be achieved via a two-mode squeezing process.

The scheme is compatible with current experimental technology.

Detection of entanglement can be performed using quadratic optomechanical coupling.

Abstract

We study entanglement of the motional degrees of freedom of two tethered and optically trapped microdisks inside a single cavity. By properly choosing the position of the trapped objects in the optical cavity and driving proper modes of the cavity it is possible to equip the system with linear and quadratic optomechanical couplings. We show that a parametric coupling between the fundamental vibrational modes of two tethered mircodiscs can be generated via a time modulated input laser. For a proper choice of the modulation frequency, this mechanism can drive the motion of the microdisks into an inseparable state in the long time limit via a two-mode squeezing process. We numerically confirm the performance of our scheme for current technology and briefly discuss an experimental setup which can be employed for detecting this entanglement by employing the quadratic coupling. We also comment on the perspectives for generating such entanglement between the oscillations of optically levitated nanospheres.