Experimental entanglement of a six-photon symmetric Dicke state

Details Experimental entanglement of a six-photon symmetric Dicke state Experimental entanglement of a six-photon symmetric Dicke state

2009-03-12

arxiv.org/abs/0903.2213v2

Phys. Rev. Lett. 103, 020504 (2009)

Physics

Quantum Physics

replaced with published version

Scientific paper

10.1103/PhysRevLett.103.020504

We report on the experimental observation and characterization of a six-photon entangled Dicke state. We obtain a fidelity as high as 0.654$\pm$0.024 and prove genuine six-photon entanglement by, amongst others, a two-setting witness yielding -0.422$\pm$0.148. This state has remarkable properties; e.g., it allows obtaining inequivalent entangled states of a lower qubit number via projective measurements, and it possesses a high entanglement persistency against qubit loss. We characterize the properties of the six-photon Dicke state experimentally by detecting and analyzing the entanglement of a variety of multipartite entangled states.

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