One-Way Deficit of Two Qubit X States
Yao-Kun Wang, Naihuan Jing, Shao-Ming Fei, Zhi-Xi Wang, Jun-Peng Cao, and Heng Fan
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Submission date: 25. Aug. 2015
published in: Quantum information processing, 14 (2015) 7, p. 2487-2497
DOI number (of the published article): 10.1007/s11128-015-1005-1
with the following different title: One-way deficit of two-qubit X states
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Quantum deficit originates in questions regarding work extraction from quantum systems coupled to a heat bath [Phys. Rev. Lett. 89, 180402 (2002)]. It links quantum correlations with quantum thermodynamics and provides a new standpoint for understanding quantum non-locality. In this paper, we propose a new method to evaluate the one-way deficit for a class of two-qubit states. The dynamic behavior of the one-way deficit under decoherence channel is investigated and it is shown that the one-way deficit of the X states with five parameters is more robust against decoherence than entanglement.