Actually, it's the equivalent of finding socks in the dark. If two photons are produced by an interaction of spin zero then the two photons will have spin up and spin down, although you can't know which is which without measuring one. What you DO know is that they have opposite spin, so by measuring one you instantly receive information about the other, however far away it is. There are several "pairs" of information which each particle/photon can have, such as momentum/location, the more accurately you measure one the less accurately you know the other, what these guys are proposing (as far as I can tell, it's at the limit of my understanding) is that they can use entanglement properties to discover information beyond Heisenberg's original limit.
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