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I have a question regarding quantum teleportation. I understand that Alice starts of with a photon A whose state she wants to teleport. Alice and Bob share an entangled pair of photons, B and C.

Then Alice does something called a Bell measurement which entangles A and B and the result of this Bell measurement for Alice is one of the Bell states.

After this, she sends the results of which Bell state to Bob who can use the appropriate unitary transform on C to complete the teleportation.

What exactly does Alice do in the Bell measurement step? I can follow the mathematics but I don't understand what one would do in a lab if I was Alice and I had the two photons. Most searches for how to entangle photons bring me to SPDC which is obviously not what is going on here. Thank you!