Multiphoton entanglement

Mohamed Bourennane; Manfred Eibl; Sascha Gaertner; Nicolai Kiesel; Christian Kurtsiefer; Marek Zukowski; Harald Weinfurter

doi:10.1117/12.483039

13 September 2002 Multiphoton entanglement

Mohamed Bourennane, Manfred Eibl, Sascha Gaertner, Nicolai Kiesel, Christian Kurtsiefer, Marek Zukowski, Harald Weinfurter

Author Affiliations +

Proceedings Volume 4917, Quantum Optics in Computing and Communications; (2002) https://doi.org/10.1117/12.483039
Event: Photonics Asia, 2002, Shanghai, China

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.

Citation Download Citation

Mohamed Bourennane, Manfred Eibl, Sascha Gaertner, Nicolai Kiesel, Christian Kurtsiefer, Marek Zukowski, and Harald Weinfurter "Multiphoton entanglement", Proc. SPIE 4917, Quantum Optics in Computing and Communications, (13 September 2002); https://doi.org/10.1117/12.483039

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