Generalized Entropy and Global Quantum Discord in Multi-party Quantum systems
Dong Pyo Chi, Jeong San Kim, Kyungjin Lee
TL;DR
This paper introduces a generalized form of quantum discord based on Tsallis-q entropy, providing analytical formulas for multi-qubit states and conditions for monogamy of quantum correlations in multi-party systems.
Contribution
It proposes the q-global quantum discord, extending quantum correlation measures, with analytical evaluation methods and monogamy conditions for multi-qubit states.
Findings
Analytic expressions for q-global quantum discord in two classes of multi-qubit states
A sufficient condition for monogamy of pairwise quantum correlations
Extension of quantum discord concepts using Tsallis-q entropy
Abstract
Using Tsallis-q entropy, we introduce the generalized concept of global quantum discord, namely the q-global quantum discord, and provide its analytic evaluation for two classes of multi-qubit states. We also provide a sufficient condition, for which the pairwise quantum correlations in terms of q-global quantum discord is monogamous in multi-party quantum systems.
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