This experiment separated two entangled photons by 18 (!) kilometers, then observed the effect of perturbing of one photon's state in the other - instantly!
If the results can be independently verified, it would have the significance of Michelson-Morley experiment that gave birth to special theory of relativity. http://en.wikipedia.org/wiki/Michelson-Morley_experiment.
This is a BIG deal!