Optics-microwave entanglement and state teleportation mediated by a cavity magnomechanical system

TL;DR

This paper demonstrates how to generate steady-state optical-microwave entanglement in a cavity magnomechanical system, enabling high-fidelity quantum state teleportation with potential practical implementation.

Contribution

It introduces a method to produce and maximize output-entanglement in a hybrid optical-microwave system for quantum information transfer.

Findings

Maximum teleportation fidelity of 0.75 achieved.

Entanglement optimized alongside frequency-conversion efficiency.

Implementation feasible with Yttrium Iron Garnet disk.

Abstract

Generating usable output-entanglement in continuous variable systems can serve as a viable resource for improving applications in quantum information science. In this work, we show how to generate steady-state output-entanglement in a two-stage conversion setup between optical and microwave photon which employs resonantly coupled magnetic and mechanical excitations, as proposed in Phys. Rev. Applied 18, 044059 (2022). We show that the entanglement can be maximized for the same set of parameters which optimize the frequency-conversion efficiency, and that it can be leveraged for a teleportation-based state-transfer protocol for coherent input-states with fidelity close to unity. We propose an implementation based on an Yittrium Iron Garnet disk of micrometer scale, and use both simulation results and reasonable estimates to assess the performance under optimized conditions. We find a maximum teleportation fidelity of 0.75 for the proposed setup.