I think I still need to do creative interpretation here.
Ok.. if I have 2 entangled photons as in a typical EPR-type experiment, can you indicate to me where would the interaction with the "environment" comes in here?
First of all, what "interferences" are you alluding to? Remember that most entanglement demonstrations do not make any "intereferences", but rather measures correlations. The only
experiment that comes close to measuring "interferences" with entangled particles are the recent experiment that showed that entangled photons can beat the diffraction limit. However, I do not think this is what you are refering to. So can you describe the scenario of such "interference"?
There have been several studies that describe decoherence of a quantum mechanical system, but I am not aware of any yet that connects decoherence with entanglement. You need to keep in mind that the reason that we do not encounter entanglement that easily IS due to decoherence. It can easily (and very often, does) destroy the entanglement between particles.