Noiseless quantum measurement and squeezing of microwave fields utilizing mechanical vibrations

TL;DR

This paper demonstrates a nearly noiseless, phase-sensitive measurement of microwave fields using cavity optomechanics, achieving significant squeezing and low noise, which advances quantum measurement and manipulation capabilities.

Contribution

It introduces a cavity optomechanical scheme for noiseless microwave measurement and achieves 8 dB squeezing with minimal added noise, surpassing previous methods.

Findings

Achieved noise less than 0.2 quanta in measurement

Demonstrated 8 dB microwave squeezing below vacuum

Enabled nearly perfect phase-sensitive measurement

Abstract

A process which strongly amplifies both quadrature amplitudes of an oscillatory signal necessarily adds noise. Alternatively, if the information in one quadrature is lost in phase-sensitive amplification, it is possible to completely reconstruct the other quadrature. Here we demonstrate such a nearly perfect phase-sensitive measurement using a cavity optomechanical scheme, characterized by an extremely small noise less than 0.2 quanta. We also observe microwave radiation strongly squeezed by 8 dB below vacuum. A source of bright squeezed microwaves opens up applications in manipulations of quantum systems, and noiseless amplification can be used even at modest cryogenic temperatures.