I SPDC & Entanglement: Downconvert for 3 Particle Entanglement?

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Is it possible to downconvert an entangled photon and could that mean three particles get entangled and why not?

Thanks! :)
 
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entropy1 said:
Is it possible to downconvert an entangled photon and could that mean three particles get entangled and why not?

Thanks! :)

I have never heard of 3 photons directly coming out of down conversion. However, sometimes you can get 4 that are entangled. That is 2 sets of 2, which happens sometimes with PDC. Once you intercept 1, the other 3 are then entangled. This technique is used for GHZ tests.

https://arxiv.org/abs/quant-ph/9810035

On the other hand: you can get 3 entangled photons from other sources.

https://arxiv.org/abs/1510.05898
 
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