Coherent states and global entanglement in an N qubit system

Details Coherent states and global entanglement in an N qubit system Coherent states and global entanglement in an N qubit system

2007-09-24

arxiv.org/abs/0709.3728v2

Physics

Quantum Physics

Scientific paper

10.1016/j.physleta.2008.03.006

We consider an $N$ qubit system and show that in the symmetric subspace,
$\mathbb{S}$ a state is not globally entangled, iff it is a coherent state. It
is also proven that in the orthogonal complement $\mathbb{S}_{\bot}$ all states
are globally entangled.

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