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Paper detail

Multiparticle entanglement in graph-diagonal states: Necessary and sufficient conditions for four qubits

The characterization of genuine multiparticle entanglement is important for entanglement theory as well as experimental studies related to quantum information theory. Here, we completely characterize genuine multiparticle entanglement for four-qubit states diagonal in the cluster-state basis. In addition, we give a complete characterization of multiparticle entanglement for all five-qubit graph states mixed with white noise, for states diagonal in the basis corresponding to the five-qubit Y-shaped graph, and for a family of graph states with an arbitrary number of qubits.

preprint2011arXivOpen access
Otfried GühneBastian JungnitschTobias MoroderYaakov S. Weinstein
quant-ph
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Otfried GühneBastian JungnitschTobias MoroderYaakov S. Weinstein

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Multiparticle entanglement in graph-diagonal states: Necessary and sufficient conditions for four qubits | BZPEER | BZPEER