# Coherent Optomechanical State Transfer between Disparate Mechanical Resonators

## TL;DR

This paper demonstrates a method for coherently transferring states between two mechanical resonators of different scales using optomechanical interactions, enabling potential quantum entanglement in hybrid systems.

## Contribution

It introduces a novel optomechanical state transfer technique between disparate resonators using a STIRAP-like process, applicable to quantum entanglement generation.

## Key findings

- Successful classical state swapping between resonators with a mass ratio of 4.
- Efficient state transfer achieved using two far-detuned laser beams.
- Technique applicable to quantum regime entanglement generation.

## Abstract

Hybrid quantum systems have been developed with various mechanical, optical and microwave harmonic oscillators. The coupling produces a rich library of interactions including two mode squeezing, swapping interactions, back-action evasion and thermal control. In a multimode mechanical system, coupling resonators of different scales (both in frequency and mass) leverages the advantages of each resonance. For example: a high frequency, easily manipulated resonator could be entangled with a low frequency massive object for tests of gravitational decoherence. Here we demonstrate coherent optomechanical state swapping between two spatially and frequency separated resonators with a mass ratio of 4. We find that, by using two laser beams far detuned from an optical cavity resonance, efficient state transfer is possible through a process very similar to STIRAP (Stimulated Raman Adiabatic Passage) in atomic physics. Although the demonstration is classical, the same technique can be used to generate entanglement between oscillators in the quantum regime.

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Source: https://tomesphere.com/paper/1704.02394