Decoherence assisted spin squeezing generation in superposition of tripartite GHZ and W states

TL;DR

This paper investigates how decoherence affects spin squeezing in superpositions of GHZ and W states, revealing robustness under certain channels and conditions, and identifying channels that enable permanent spin squeezing.

Contribution

It introduces an analysis of spin squeezing dynamics in superposed GHZ and W states under various decoherence channels, highlighting conditions for robustness and permanent squeezing.

Findings

Superposition of GHZ and W states is robust against spin squeezing under amplitude and phase damping.

Depolarisation channel can generate and sustain permanent spin squeezing in these states.

Certain mean spin directions enhance the robustness of spin squeezing against decoherence.

Abstract

In the present paper, we study spin squeezing under decoherence in the superposition of tripartite maximally entangled GHZ and W states. Here we use amplitude damping, phase damping and depolarisation channel. We have investigated the dynamics of spin squeezing with the interplay of superposition and decoherence parameters with different directions of the mean spin vector. We have found the mixture of GHZ and W states is robust against spin squeezing generation for amplitude damping and phase damping channels for certain directions of the mean spin vector. However, the depolarisation channel performs well for spin squeezing generation and generates permanent spin squeezing in the superposition of GHZ and W states.