13 September 2002 Multiphoton entanglement
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Abstract
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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