Quantum Communication ? (Score 1)

So ok, I haven't read the whole article and I may not know what I'm talking about :-) but its just an idea..

If you have 4 atoms A,B,Y,Z.
Y and Z are entangled, AND A is entangled with Y and B is entangled with Z
SO if you alter the state of A, Y is affected (which therefore means Z is affected and thus B is affected), if you measure A or B does that collapse the entanglement or whatever or not ?
So do you effectively have communication between Y and Z which is measurable at A and B ???
Was that confusing ? Just a question...