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Finding averages of observables of Bell states

  1. Apr 6, 2009 #1
    Hi I am looking at Quantum Computation by Neilsen and Chuang at the CHSH inequality.

    Looking at the spin singlet state they make measurements of for example the observable Z1
    and Z2-X1 and then find the expectation value of the product.

    I am slightly confused here because
    a) Z and X are gates does it just mean to find the average of the system after these have acted on the system?
    b)Secondly can I find the average of a two qubit system without using the density operator. If I need to use the density operator is there a simple way?


    Thanks

    (Sorry its hard to make it clear without waffling on for ages but since its a popular book hopefully someone will understand me).
     
  2. jcsd
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