Global Quantum Discord in Multipartite Systems

Details Global Quantum Discord in Multipartite Systems Global Quantum Discord in Multipartite Systems

2011-05-12

arxiv.org/abs/1105.2548v3

Phys. Rev. A 84, 042109 (2011)

Physics

Quantum Physics

v3: 7 pages, 6 figures. Published version

Scientific paper

10.1103/PhysRevA.84.042109

We propose a global measure for quantum correlations in multipartite systems, which is obtained by suitably recasting the quantum discord in terms of relative entropy and local von Neumann measurements. The measure is symmetric with respect to subsystem exchange and is shown to be non-negative for an arbitrary state. As an illustration, we consider tripartite correlations in the Werner-GHZ state and multipartite correlations at quantum criticality. In particular, in contrast with the pairwise quantum discord, we show that the global quantum discord is able to characterize the infinite-order quantum phase transition in the Ashkin-Teller spin chain.

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