Mixedness, Coherence and Entanglement in a Family of Three-Qubit States

We consider a family of states describing three-qubit systems. We derived formulas showing the relations between linear entropy and measures of coherence such as degree of coherence, first- and second-order correlation functions. We show that qubit–qubit states are strongly entangled when linear ent...

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Bibliographic Details
Published in:Entropy
Main Authors: Joanna K. Kalaga, Wiesław Leoński, Radosław Szczȩśniak, Jan Peřina
Format: Article
Language:English
Published: MDPI AG 2022-02-01
Subjects:
quantum entanglement
linear entropy
coherence
purity of states
concurrence
three-qubit systems
Online Access:https://www.mdpi.com/1099-4300/24/3/324
Description
Summary:We consider a family of states describing three-qubit systems. We derived formulas showing the relations between linear entropy and measures of coherence such as degree of coherence, first- and second-order correlation functions. We show that qubit–qubit states are strongly entangled when linear entropy reaches some range of values. For such states, we derived the conditions determining boundary values of linear entropy parametrized by measures of coherence.
ISSN:1099-4300

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