Analytical expression of Genuine Tripartite Quantum Discord for Symmetrical X-states

Abstract

The study of classical and quantum correlations in bipartite and multipartite systems is crucial for the development of quantum information theory. Among the quantifiers adopted in tripartite systems, the genuine tripartite quantum discord (GTQD), estimating the amount of quantum correlations shared among all the subsystems, plays a key role since it represents the natural extension of quantum discord used in bipartite systems. In this paper, we derive an analytical expression of GTQD for three-qubit systems characterized by a subclass of symmetrical X-states. Our approach has been tested on both GHZ and maximally mixed states reproducing the expected results. Furthermore, we believe that the procedure here developed constitutes a valid guideline to investigate quantum correlations in form of discord in more general multipartite systems.

13 pages, 4 figures. v3: Added some references and corrected some typos

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Cited by in corpus (3)

• The dynamic behaviors of local quantum uncertainty for three-qubit X states under decoherence channels
• Nonclassicality and criticality in symmetry-protected magnetic phases
• Maximally genuine multipartite entangled mixed X-states of N-qubits