Correlated noise can be beneficial to quantum transducers

TL;DR

This paper shows that exploiting noise correlations in coupled quantum systems, specifically in a microwave-optical transducer, can significantly reduce noise impact and improve quantum transduction performance.

Contribution

It introduces a systematic framework for utilizing noise correlations to suppress noise and optimize quantum transducer performance, a novel approach in quantum noise management.

Findings

Noise correlations can significantly suppress noise in quantum transducers.

Optimization of coupling parameters enhances transduction efficiency.

Systematic framework guides practical design of noise-resilient quantum devices.

Abstract

Quantum systems are inherently susceptible to noise -- a notorious factor that induces decoherence and limits the performance of quantum applications. To mitigate its detrimental effects, various techniques have been developed, including cryogenic cooling, bath engineering, and quantum error correction. In this paper, we demonstrate that by exploiting noise correlations in coupled quantum systems, the overall impact of noise can be significantly suppressed. Specifically, for a microwave-optical quantum transducer based on piezo-optomechanics, correlations between the noise affecting the acoustic and electrical modes can lead to substantial noise reduction, thereby enhancing the performance of quantum transduction. This reduction is primarily governed by the phase of the piezo-mechanical coupling and is also influenced by system parameters such as the coupling ratio and mode cooperativities. Since these parameters simultaneously affect the signal transmissivity, they must be optimized to achieve an optimal performance in quantum transduction. Our work provides a systematic framework for this optimization, offering a guidance for practical designs.