Impulse measurements enhanced with squeezed readout light

TL;DR

This paper demonstrates how squeezed light can improve impulse measurement sensitivity beyond the standard quantum limit, highlighting the advantages of broadband squeezing and identifying fundamental limits due to system properties.

Contribution

It provides a quantitative analysis of the benefits and limitations of using squeezed light in impulse measurements with mechanical detectors.

Findings

Broadband squeezing outperforms frequency-independent squeezing.

Optimal scaling of sensitivity with squeezing strength is derived.

There is a fundamental limit to squeezing benefits based on mechanical properties.

Abstract

We quantify how squeezed light can reduce quantum measurement noise to levels below the standard quantum limit in impulse measurements with mechanical detectors. The broadband nature of the signal implies that frequency-dependent squeezing performs better than frequency-independent squeezing. We calculate the optimal scaling of the impulse sensitivity with the squeezing strength, and quantify degradations due to photodetection losses. Even for lossless measurement, we find there exists a fundamental limit to the benefit of squeezing that depends only on the system's mechanical properties.