re: Quantum Teleportation Signal-to-Noise Ratio
To clarify, it is actually a collection of photons in the optical trap, of which perhaps only 10 percent are entangled. So the S-N ratio is quite low, but there is a statistically significant spooky action-at-a-distance effect that is readily detectable, due to the entanglement of the small fraction of photons.
There are still more theories and experiments that aim at completely eliminating "noise" photons and getting a virtually pure entangled system. That is where alot of research is focused now.