# Photon-phonon-photon transfer in optomechanics

## TL;DR

This paper demonstrates a protocol for transferring a nonclassical single-photon quantum state through an optomechanical system, showing the preservation of nonclassicality and non-Gaussianity in the mechanical mode.

## Contribution

It introduces a method for quantum state transfer in optomechanics that preserves nonclassical features, validated for current experimental setups.

## Key findings

- Recovered state exhibits negative Wigner function, indicating nonclassicality.
- The transferred state remains quantum non-Gaussian across various parameters.
- Current experiments can test the complete quantum state transfer protocol.

## Abstract

We consider transfer of a highly nonclassical quantum state through an optomechanical system. That is we investigate a protocol consisting of sequential upload, storage and reading out of the quantum state from a mechanical mode of an optomechanical system. We show that provided the input state is in a test-bed single-photon Fock state, the Wigner function of the recovered state can have negative values at the origin, which is a manifest of nonclassicality of the quantum state of the macroscopic mechanical mode and the overall transfer protocol itself. Moreover, we prove that the recovered state is quantum non-Gaussian for wide range of setup parameters. We verify that current electromechanical and optomechanical experiments can test this complete transfer of single photon.