Protecting and enhancing spin squeezing under decoherence using weak measurement

TL;DR

This paper introduces a method using weak measurement reversal to protect and enhance spin squeezing in quantum systems affected by various decoherence channels, preventing sudden loss of squeezing.

Contribution

It presents a novel approach employing measurement reversal to significantly improve spin squeezing robustness against amplitude-damping, depolarizing, and phase-damping decoherence.

Findings

Spin squeezing can be greatly enhanced under decoherence.

Spin-squeezing sudden death can be avoided with the proposed method.

The method is effective across multiple decoherence channels.

Abstract

We propose an efficient method to protect spin squeezing under the action of amplitude-damping, depolarizing and phase-damping channels based on measurement reversal from weak measurement, and consider an ensemble of N independent spin-1/2 particles with exchange symmetry. We find that spin squeezing can be enhanced greatly under three different decoherence channels and spin-squeezing sudden death (SSSD) can be avoided undergoing amplitude damping and phase-damping channels.