Detecting Genuine Multipartite Entanglement with Two Local Measurements

Details Detecting Genuine Multipartite Entanglement with Two Local Measurements Detecting Genuine Multipartite Entanglement with Two Local Measurements

2004-05-27

arxiv.org/abs/quant-ph/0405165v2

Physical Review Letters 94, 060501 (2005)

Physics

Quantum Physics

4 pages including 1 figure, revtex4; changes before publication in PRL; discussion about Mermin's inequality added in Ref. 22

Scientific paper

10.1103/PhysRevLett.94.060501

We present entanglement witness operators for detecting genuine multipartite entanglement. These witnesses are robust against noise and require only two local measurement settings when used in an experiment, independent from the number of qubits. This allows detection of entanglement for an increasing number of parties without a corresponding increase in effort. The witnesses presented detect states close to GHZ, cluster and graph states. Connections to Bell inequalities are also discussed.

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