# Quantum transduction with adaptive control

## TL;DR

This paper introduces an adaptive quantum transduction protocol that overcomes the limitations of direct mode conversion, enabling robust quantum signal transfer without strict matching conditions, and is feasible across various physical platforms.

## Contribution

The paper proposes a novel adaptive protocol for quantum transduction that does not require matching conditions and is robust against common experimental imperfections.

## Key findings

- The adaptive protocol enables quantum state transfer between microwave and optical modes.
- It is robust against finite squeezing, thermal noise, and detection imperfections.
- The protocol is feasible with Gaussian operations across different physical platforms.

## Abstract

Quantum transducers play a crucial role in hybrid quantum networks. A good quantum transducer can faithfully convert quantum signals from one mode to another with minimum decoherence. Most investigations of quantum transduction are based on the protocol of direct mode conversion. However, the direct protocol requires the matching condition, which in practice is not always feasible. Here we propose an adaptive protocol for quantum transducers, which can convert quantum signals without requiring the matching condition. The adaptive protocol only consists of Gaussian operations, feasible in various physical platforms. Moreover, we show that the adaptive protocol can be robust against imperfections associated with finite squeezing, thermal noise, and homodyne detection. It can be implemented to realize quantum state transfer between microwave and optical modes.