# Single-photon transfer using levitated cavityless optomechanics

## TL;DR

This paper proposes a theoretical scheme for quantum memory and photon wavelength conversion using a levitated nanoparticle in cavityless optomechanics, demonstrating high fidelity transfer and potential for quantum information processing.

## Contribution

It introduces a novel cavityless optomechanical protocol for single-photon storage and wavelength conversion with high fidelity, using levitated nanoparticles and feedback cooling.

## Key findings

- High fidelity photon-phonon-photon transfer demonstrated
- Robust quantum state conversion under accessible experimental parameters
- Feasibility of high fidelity wavelength conversion with control pulses

## Abstract

We theoretically explore a quantum memory using a single nanoparticle levitated in an optical dipole trap and subjected to feedback cooling. This protocol is realized by storing and retrieving a single photon quantum state from a mechanical mode in levitated cavityless optomechanics. We describe the effectiveness of the photon-phonon-photon transfer in terms of the fidelity, the Wigner function, and the zero-delay second-order autocorrelation function. For experimentally accessible parameters, our numerical results indicate robust conversion of the quantum states of the input signal photon to those of the retrieved photon. We also show that high fidelity single-photon wavelength conversion is possible in the system as long as intense control pulses shorter than the mechanical damping time are used. Our work opens up the possibility of using levitated optomechanical systems for applications of quantum information processing.