I SPDC & Entanglement: Downconvert for 3 Particle Entanglement?

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Downconversion of entangled photons can lead to the generation of multiple entangled particles, though direct three-photon outputs from downconversion are uncommon. Typically, four entangled photons can be produced, resulting in two pairs that can be further manipulated in experiments. Cascaded spontaneous parametric downconversion (SPDC) crystals can generate three entangled photons, but they often have different energy levels, complicating experimental applications. Despite these challenges, polarization entanglement among three photons is achievable. The discussion highlights the complexities and possibilities of entangling multiple photons through various methods.
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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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