How unusual non-linear crystals can entangle particles of light, or photons.
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Quantum entanglement involves a special process of splitting photons into two. But it involves a process and a crystal that can split photons. How does that lead to entangled particles?

To find out more about the specifics of how to entangle photons, check out this awesome video from whentheappledrops    • How to Produce Entanglement  

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Creator: Dianna Cowern
Research: Sophia Chen
Thanks to: Jabril Ashe, Ashley Warner, Rebecca Holmes and Dan Walsh