But when you say communicate, typically you want to know something about your destination. So now to Olivier’s question: could we use this property - quantum entanglement - to communicate from a distant star system to our own? The answer to that is yes, if you consider making a measurement at a distant location a form of communication. This seems like a perfect mechanism for sending information over vast distances, as Ethan notes: That is, if Alice measures her particle in state 1 at precisely noon in Schenectady, she knows that Bob in Portland will also measure his particle to be in state 1, whether he's in Portland, Maine, Portland, Oregon, or Portland Station on one of the moons of Yavin. The basic scenario for entanglement-based communication looks like this: two people, traditionally named "Alice" and "Bob" share a pair of particles that can each be measured in one of two quantum states, which we'll call "0" and "1." These particles are prepared in an entangled state in which a measurement of the state of Alice's particle is correlated with the measured state of Bob's particle, no matter how far apart they are.
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