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Entropy 2017, 19(11), 602;

Revealing Tripartite Quantum Discord with Tripartite Information Diagram

Department of Engineering Science, National Cheng Kung University, Tainan 701, Taiwan
Author to whom correspondence should be addressed.
Received: 29 September 2017 / Revised: 22 October 2017 / Accepted: 8 November 2017 / Published: 10 November 2017
(This article belongs to the Section Quantum Information)
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A new measure based on the tripartite information diagram is proposed for identifying quantum discord in tripartite systems. The proposed measure generalizes the mutual information underlying discord from bipartite to tripartite systems, and utilizes both one-particle and two-particle projective measurements to reveal the characteristics of the tripartite quantum discord. The feasibility of the proposed measure is demonstrated by evaluating the tripartite quantum discord for systems with states close to Greenberger–Horne–Zeilinger, W, and biseparable states. In addition, the connections between tripartite quantum discord and two other quantum correlations—namely genuine tripartite entanglement and genuine tripartite Einstein–Podolsky–Rosen steering—are briefly discussed. The present study considers the case of quantum discord in tripartite systems. However, the proposed framework can be readily extended to general N-partite systems. View Full-Text
Keywords: quantum discord; information theory; tripartite systems quantum discord; information theory; tripartite systems

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Lee, W.-T.; Li, C.-M. Revealing Tripartite Quantum Discord with Tripartite Information Diagram. Entropy 2017, 19, 602.

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