Maximally entangled three-qubit states via geometric measure of entanglement

Details Maximally entangled three-qubit states via geometric measure of entanglement Maximally entangled three-qubit states via geometric measure of entanglement

2009-05-23

arxiv.org/abs/0905.3791v4

Phys. Rev. A 80, 052315 (2009)

Physics

Quantum Physics

final version, to appear in PRA

Scientific paper

10.1103/PhysRevA.80.052315

Bipartite maximally entangled states have the property that the largest Schmidt coefficient reaches its lower bound. However, for multipartite states the standard Schmidt decomposition generally does not exist. We use a generalized Schmidt decomposition and the geometric measure of entanglement to characterize three-qubit pure states and derive a single-parameter family of maximally entangled three-qubit states. The paradigmatic Greenberger-Horne-Zeilinger (GHZ) and W states emerge as extreme members in this family of maximally entangled states. This family of states possess different trends of entanglement behavior: in going from GHZ to W states the geometric measure and the relative entropy of entanglement and the bipartite entanglement all increase monotonically whereas the three-tangle and bi-partition negativity both decrease monotonically.

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