Processing light with an optically tunable mechanical memory

TL;DR

This paper introduces a multi-mode cavity optomechanical memory that significantly extends storage time and control over optical signals by using an additional optical field for dynamic feedback, enhancing optomechanical information processing.

Contribution

It demonstrates a novel multi-mode cavity optomechanical memory with extended lifetime and in-situ control capabilities through time-varying parametric feedback.

Findings

Memory decay time extended by an order of magnitude

Effective mechanical dissipation rate reduced by two orders of magnitude

Phase of stored field shifted by over 2π

Abstract

Mechanical systems are one of the promising platforms for classical and quantum information processing and are already widely-used in electronics and photonics. Cavity optomechanics offers many new possibilities for information processing using mechanical degrees of freedom; one of them is storing optical signals in long-lived mechanical vibrations by means of optomechanically induced transparency. However, the memory storage time is limited by intrinsic mechanical dissipation. More over, in-situ control and manipulation of the stored signals--processing--has not been demonstrated. Here, we address both of these limitations using a multi-mode cavity optomechanical memory. An additional optical field coupled to the memory modifies its dynamics through time-varying parametric feedback. We demonstrate that this can extend the memory decay time by an order of magnitude, decrease its effective mechanical dissipation rate by two orders of magnitude, and deterministically shift the phase of a stored field by over 2$\pi$. This further expands the information processing toolkit provided by cavity optomechanics.