Strong polygamy of multi-party $q$-expected quantum correlations

TL;DR

This paper introduces a stronger form of polygamy inequalities for multi-party quantum correlations using Tsallis $q$-entropy, providing tighter bounds and linking entanglement with quantum discord.

Contribution

It develops a new class of stronger, tighter polygamy inequalities based on Tsallis $q$-entropy and establishes their equivalence with quantum discord inequalities.

Findings

New stronger polygamy inequalities for multi-party entanglement.

Inequalities are tighter than traditional polygamy bounds.

Established equivalence between entanglement and discord inequalities.

Abstract

We show that the polygamous nature of multi-party quantum correlations can be characterized in a {\em stronger} form based on Tsallis $q$-entropy and $q$-expectation value. By considering the amount of entanglement that can be distributed in multi-party systems, we establish a class of strong polygamy inequalities of multi-party entanglement in terms of Tsallis $q$-entropy and $q$-expectation for $q \geq 1$. Our new class of inequalities is in fact tighter than the usual polygamy inequalities of multi-party entanglement, and the tightness is explicitly illustrated by an example. Moreover, our new class of inequalities is concerned with the $q$-expected entanglement distributed between a single party and any possible subsets of the rest parties whereas the usual polygamy inequality only considers the entanglement between a single party and another. We further establish the equivalence between strong polygamy inequalities of quantum entanglement and quantum discord distributed in multi-party quantum systems.