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Homework Help: I have been hanging on this problem for a long time without a solution

  1. Jul 9, 2007 #1
    I have been hanging on this problem for a long time without a solution!!

    Suppose we have a single qubit principal system ,interacting with a single qubit environment through the transformation
    U=P0[tex]\otimes[/tex]I+P1[tex]\otimes[/tex]X
    where X is the usual Pauli matrix (acting on the enviornment)and P0=|0><0| ,P1=|1><1| are projectors (acting on the system ).Give the quantum operation for this process ,in the operator-sum representation ,assuming the environment starts in the state |0>

    I have two problem about this exercise :
    1.how to represent the principal system
    2.how to find an orthonormal basis for the environment so that the operatior-sum representation can be arrived
     
  2. jcsd
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