13 September 2002 Multiphoton entanglement
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Multiphoton entanglement is the basis of many quantum communication schemes, quantum cryptographic protocols, and fundamental tests of quantum theory. Spontaneous parametric down-conversion is the most effective source for polarization entangled photon pairs. Here we show, that a entangled 4-photon state can be directly created by parametric down-conversion. This state exhibit perfect quantum correlations and a high robustness of entanglement against photon loss. We have used this state for four-particle test of local realistic theories. Therefore this state can be used for new types of quantum communication. We also report on possibilities for the experimentally realization of a 3-photon entangled state, the so called W-state, and discuss some of its properties.
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Mohamed Bourennane, Mohamed Bourennane, Manfred Eibl, Manfred Eibl, Sascha Gaertner, Sascha Gaertner, Nicolai Kiesel, Nicolai Kiesel, Christian Kurtsiefer, Christian Kurtsiefer, Marek Zukowski, Marek Zukowski, Harald Weinfurter, Harald Weinfurter, "Multiphoton entanglement", Proc. SPIE 4917, Quantum Optics in Computing and Communications, (13 September 2002); doi: 10.1117/12.483039; https://doi.org/10.1117/12.483039


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