Four-photon entanglement from down-conversion
作者： Harald Weinfurter , Marek Żukowski
DOI: 10.1103/PHYSREVA.64.010102
关键词: Photon 、 Bell state 、 No-communication theorem 、 W state 、 Physics 、 Hidden variable theory 、 Quantum electrodynamics 、 Local hidden variable theory 、 Quantum entanglement 、 Photon entanglement 、 Quantum mechanics
摘要: Double-pair emission from type-II parametric down-conversion results in a highly entangled four-photon state. Due to interference, which is similar bunching thermal emission, this state not simply product of two pairs. The observation can be achieved by splitting the modes at beam splitters and subsequent detection photon each output. Here we describe features construct Bell-type inequality, gives necessary sufficient condition for test local realistic hidden variable theories.
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