I've had this conversation on HN and I came to the conclusion there isn't much semantic difference between two entangled photos and, say, two sides of a coin split down the middle. Alice and Bob could have just as easily had two sides of a coin they didn't look at, and the situation would be the same. As soon as you look at what you have, you know what the other person has. If you don't look, but a machine interacts with it, than the same situation arises.<p>The two entangled photons were once close to each other, just like the two sides of the coin. So what's the difference here?<p>Looking at a photon you can't tell whether someone else has looked at the entangled photon. Same with the sides of the coin.<p><a href="http://www.scientificamerican.com/article/quantum-entanglement-creates-new-state-of-matter1/" rel="nofollow">http://www.scientificamerican.com/article/quantum-entangleme...</a>