Spin Squeezing Property of Weighted Graph States

TL;DR

This paper investigates the robustness of spin squeezing in weighted graph states under decoherence, demonstrating their potential to enhance interferometric sensitivity beyond traditional states.

Contribution

It introduces the analysis of spin squeezing in weighted graph states and shows their robustness against decoherence, outperforming GHZ and product states in sensitivity.

Findings

Spin squeezing in weighted graph states remains superior under decoherence.

Decoherence does not significantly diminish the spin squeezing advantage.

Weighted graph states maintain improved interferometric sensitivity despite environmental noise.

Abstract

We study the spin squeezing property of weighted graph states, which can be used to improve the sensitivity in interferometry. Decoherence reduces the spin squeezing property but the result remains superior over other reference schemes with GHZ-type maximally entangled states and product states. We study the time evolution of spin squeezing of weighted graph states coupled to different decoherence channels. Based on the analysis, the spin squeezing of the weighted graph states is robust in the presence of decoherence and the decoherence limit in the improvement of the interferometric sensitivity is still achievable.