This concept is rather interesting : "Excitation of two atoms by a propagating single photon pulse" -- http://arxiv.org/abs/1411.3445 . They say that, in principle, one can tailor an optical pulse so that it will excite two atoms from the ground state (i.e., the |gg> state) so it ends up in any state that we want, as long as it is a linear combination of the following two states: |s> = 1/√2 ( |eg> + |ge> ) and |a> = 1/√2 (|eg> - |ge> ) and we can do so with 100% certainty of hitting the desired state, in theory. As a special case of this, we can predictably select between |eg> and |ge>. Here's what is interesting: the control over the final state is perfect even for an arbitrarily large distance between the two atoms. They "cooperatively" end up in states that are anti-correlated, AND you have control over the state of each atom, which you manipulate by changing the phase relation between the electromagnetic fields near the respective atoms. Assuming that all this is correct, does this in any way lead towards FTL communication?