Continuous optical-to-mechanical quantum state transfer in the unresolved sideband regime

TL;DR

This paper introduces a novel continuous optical-to-mechanical quantum state transfer protocol that functions in the unresolved sideband regime, broadening the scope of optomechanical devices usable for quantum information tasks.

Contribution

It presents a feedback cooling-based protocol operable outside the resolved sideband regime, compatible with current technology, enabling high-fidelity transfer of non-Gaussian states.

Findings

Operates effectively in the unresolved sideband regime

Enables transfer of non-Gaussian quantum states with high fidelity

Expands the range of optomechanical devices suitable for quantum state transfer

Abstract

Optical-to-mechanical quantum state transfer is an important capability for future quantum networks, quantum communication, and distributed quantum sensing. However, existing continuous state transfer protocols operate in the resolved sideband regime, necessitating a high-quality optical cavity and a high mechanical resonance frequency. Here, we propose a continuous protocol that operates in the unresolved sideband regime. The protocol is based on feedback cooling, can be implemented with current technology, and is able to transfer non-Gaussian quantum states with high fidelity. Our protocol significantly expands the kinds of optomechanical devices for which continuous optical-to-mechanical state transfer is possible, paving the way towards quantum technological applications and the preparation of macroscopic superpositions to test the fundamentals of quantum science.