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Experimental observation of four-photon entanglement from parametric down-conversion
Manfred Eibl1, Sascha Gaertner, Mohamed Bourennane
1Max-Planck-Institut für Quantenoptik, D-85748 Garching, Germany.
Physical Review Letters
|June 6, 2003
Abstract:
We observe polarization entanglement between four photons produced from a single down-conversion source. The nonclassical correlations between the measurement results violate a generalized Bell inequality for four qubits. The characteristic properties and its easy generation with high interferometric contrast make the observed four-photon state well suited for implementing advanced quantum communication schemes such as multiparty quantum key distribution, secret sharing, and telecloning.