Coherence Concurrence for X States
Ming-Jing Zhao, Teng Ma, Zhen Wang, Shao-Ming Fei, and Rajesh Pereira
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Submission date: 26. Feb. 2020
published in: Quantum information processing, 19 (2020) 3, art-no. 104
DOI number (of the published article): 10.1007/s11128-020-2601-2
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We study the properties of coherence concurrence and present a physical explanation analogous to the coherence of assistance. We give an optimal pure state decomposition which attains the coherence concurrence for qubit states. We prove the additivity of coherence concurrence under direct sum operations in another way. Based on these, we calculate analytically the coherence concurrence for X states and show its optimal decompositions. Moreover, we show that the coherence concurrence is exactly twice the convex roof extended negativity of the Schmidt correlated states, thus establishing a direct relation between coherence concurrence and quantum entanglement.