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Quantum Information Processing

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01-09-2018

Analytical expression of quantum discord for rank-2 two-qubit states

Authors: Xue-Na Zhu, Shao-Ming Fei, Xianqing Li-Jost

Published in: Quantum Information Processing | Issue 9/2018

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Abstract

Quantum correlations characterized by quantum entanglement and quantum discord play important roles in many quantum information processing. We study the relations among the entanglement of formation, concurrence, tangle, linear entropy-based classical correlation and von Neumann entropy-based classical correlation . We present analytical formulae of linear entropy-based classical correlation for arbitrary \(d\otimes 2\) quantum states and von Neumann entropy-based classical correlation for arbitrary \(2\otimes 2\) rank-2 quantum states. From the von Neumann entropy-based classical correlation, we derive an explicit formula of quantum discord for arbitrary rank-2 two-qubit quantum states.

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Title: Analytical expression of quantum discord for rank-2 two-qubit states
Authors: Xue-Na Zhu
Shao-Ming Fei
Xianqing Li-Jost
Publication date: 01-09-2018
Publisher: Springer US
Published in: Quantum Information Processing / Issue 9/2018
Print ISSN: 1570-0755
Electronic ISSN: 1573-1332
DOI: https://doi.org/10.1007/s11128-018-2007-6

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