Using anti-squeezed Schr\"odinger cat states for detection of a given phase shift

TL;DR

This paper introduces a method using anti-squeezed Schrödinger cat states to improve phase shift detection in optical interferometers, enhancing robustness to losses and outperforming Gaussian squeezed states.

Contribution

It demonstrates how anti-squeezing enhances non-Gaussian Schrödinger cat states for phase detection, providing a new approach to improve sensitivity under realistic conditions.

Findings

Anti-squeezing increases robustness to optical losses.

Optimal anti-squeezing improves phase sensitivity.

Compared to Gaussian states, Schrödinger cat states offer superior performance.

Abstract

We propose to use the antisqueezing-enhanced non-Gaussian Schr\"odinger cat quantum states of the probing light for the task of detection of a given phase shift in optical interferometers. We show that the antisqueezing allows to increase the robustness of the setup to optical losses. We find the optimal degrees of the antisqueezing for experimentally achievable values of the Schr\"odinger cat amplitude and the optical losses and compare the resulting sensitivity with the one provided by the Gaussian squeezed states.