Optical wavelength conversion of quantum states with optomechanics

TL;DR

This paper proposes an optomechanical interface for converting quantum states between optical fields of different wavelengths, enabling high-fidelity quantum state transfer with potential for operation at higher temperatures.

Contribution

It introduces a novel pulsed optomechanical scheme for quantum wavelength conversion that achieves high fidelity and thermal robustness.

Findings

High fidelity quantum state conversion is theoretically feasible.

Pulsed scheme maintains fidelity at elevated temperatures.

System parameters are within experimental reach.

Abstract

An optomechanical interface that converts quantum states between optical fields with distinct wavelengths is proposed. A mechanical mode couples to two optical modes via radiation pressure and mediates the quantum state mapping between the two optical modes. A sequence of optomechanical $\pi/2$ pulses enables state-swapping between optical and mechanical states as well as the cooling of the mechanical mode. Theoretical analysis shows that high fidelity conversion can be realized for states with small photon numbers in systems with experimentally achievable parameters. The pulsed conversion process also makes it possible to maintain high conversion fidelity at elevated bath temperatures.