Q: With entangled particles, can you tell when/how the other particle is measured?
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Generally along the lines of “when you affect one entangled particle it instantly affects the other” or slightly more sophisticated “when you measure the state of one entangled particle, the other collapses to the same state”. The distant entangled particle is like a lost wallet: there’s no way to tell if someone’s seen it until they call you. The fact that you can’t tell the difference between a random state and an entangled state is super not obvious. On the other hand, if you have both particles, you can tell the difference between the four “maximally entangled states“. Here’s what happens to the entangled state this post keeps talking about:There are four maximally entangled states for pairs of two-state systems.