Thursday, July 4, 2013

1307.0576 (Shuhao Wang et al.)

Closed form of local quantum uncertainty and a sudden change of quantum

Shuhao Wang, Hui Li, Gui Lu Long
Quantum correlations play vital roles in the quantum features in quantum information processing tasks, and it is of fundamental importance in studying quantum phenomenons. Among the measures of quantum correlations, recently, the local quantum uncertainty (LQU) for bipartite quantum systems is proposed [Phys. Rev. Lett. 110, 240402 (2013)]. In this paper, we have derived the closed form of the LQU for arbitrary-dimensional bipartite quantum states. We revisit the problem of sudden change of quantum correlations in the transition from separable to bound and free entangled states [Phys. Rev. A 87, 022340 (2013)]. By using the LQU, we have demonstrated that the sudden change located exactly near the transition point from separable to bound entangled states.
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