Robust Phase Estimation of Squeezed State

TL;DR

This paper introduces a robust fixed-interval smoothing method for phase estimation of squeezed quantum states, improving accuracy and resilience against parameter uncertainties, surpassing traditional coherent-state limits.

Contribution

It presents a novel robust smoothing technique for phase estimation in squeezed states, enhancing performance under parameter uncertainties.

Findings

Achieves improved phase estimation accuracy.

Demonstrates robustness against parameter uncertainties.

Surpasses coherent-state limit in estimation performance.

Abstract

Optimal phase estimation of a phase-squeezed quantum state of light has been recently shown to beat the coherent-state limit. Here, the estimation is made robust to uncertainties in underlying parameters using a robust fixed-interval smoother.