Quantum transduction with microwave and optical entanglement

TL;DR

This paper explores quantum transduction between microwave and optical states using entanglement in piezo-optomechanical systems, demonstrating advantages over direct transduction and potential for microwave quantum networks.

Contribution

It provides a concrete scheme for entanglement-based quantum transduction using piezo-optomechanical systems and compares its quantum capacity to traditional methods.

Findings

Entanglement-based transduction has positive quantum capacity where direct transduction fails.

Demonstrates microwave-microwave entanglement generation via entanglement swapping.

Shows potential for connecting microwave quantum processors through teleportation.

Abstract

Quantum transduction refers to the coherent conversion between microwave and optical states, which can be achieved by quantum teleportation if given high fidelity microwave-optical entanglement, namely entanglement-based quantum transduction. Reliable microwave-optical entanglement can be generated using various platforms. In this paper, we base the discussion on piezo-optomechanical system and make the teleportation induced conversion scheme more concrete in the framework of quantum channel theory. By comparing the quantum capacity between the entanglement-based conversion channel and the traditional direct quantum transduction channel, we show entanglement-based scheme indeed admits a positive transduction rate when the direct quantum transduction has zero quantum capacity. Given two piezo-optomechanical systems, we also investigate the generation of microwave-microwave entanglement from entanglement swapping within continuous variable and discrete variable settings, showing the potentials of directly connecting microwave quantum processor by microwave-microwave quantum teleportation.