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  • $\begingroup$ I thought the point of Quantum was there is no yelling, and they magically change their state in Spooky action, am I missing something ? $\endgroup$
    – Ksec
    Commented Sep 28, 2016 at 3:42
  • $\begingroup$ @user982438 Na, quantum teleportation requires the yelling. You're probably thinking of Bell test experiments. But even those don't require faster-than-light effects. Bell tests require something weird, but there's lots of possible weird to choose from. $\endgroup$
    – Craig Gidney
    Commented Sep 28, 2016 at 3:46
  • $\begingroup$ Just a few notes on the previous answer. For teleportation with photons the joint measurement on Q (the photon with the state to be teleported) and A (the member of the entangled pair held by Alice) is typically done with a simple beamsplitter followed by detectors. The has probabilistic outcomes which essentially means that it will not always provide a conclusive result that will allow Alice to tell Bob, which transformation to make. Since the detection destroys the photons there is also no way to repeat the measurement. Bottom line is that with the simplest setup the teleportation only succe $\endgroup$
    – user131467
    Commented Sep 28, 2016 at 5:53
  • $\begingroup$ Actually it is 1/4 of the times since there are 4 possible Bell states and the Hong-Ou-Mandel process (the beam splitter method) can only measure one of them. But if it succeeds then one does not need to change the final state. $\endgroup$
    – flippiefanus
    Commented Sep 28, 2016 at 7:09