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I Maximally entangled two-qubit Bell states

  1. Sep 6, 2016 #1
    In the four maximally entangled two-qubit Bell states, what is the difference between the first and the second states, similarly, the difference between the third and the fourth states. What the different in signs mean( +,-)
  2. jcsd
  3. Sep 6, 2016 #2


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    Staff: Mentor

    Please do not use svg images. Do they not come out correctly.

    I can anyway answer your question. You will notice that ##\Psi^\pm## and ##\Phi^\pm## differ by the sign between the two terms. This change of sign ensures orthogonality.
  4. Sep 6, 2016 #3
    Thank you..

    For instance, in phi state for both (+ and -), in the first term Alice would get 0 and Bob 0 as well for both (+,-). Actually, it is not clear in terms of definition and the way of measurement, as both look similar.

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