Four-photon entanglement from down-conversion
- 7 June 2001
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review A
- Vol. 64 (1) , 010102
- https://doi.org/10.1103/physreva.64.010102
Abstract
Double-pair emission from type-II parametric down-conversion results in a highly entangled four-photon state. Due to interference, which is similar to bunching from thermal emission, this state is not simply a product of two pairs. The observation of this state can be achieved by splitting the two emission modes at beam splitters and subsequent detection of a photon in each output. Here we describe the features of this state and construct a Bell-type inequality, which gives a necessary and sufficient condition for a four-photon test of local realistic hidden variable theories.Keywords
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