Posted by **s** on Friday, April 19, 2013 at 5:31am.

Consider the observable M that corresponds to a measurement in the sign basis where the measurement value is 3 if the outcome is + and −2 if the outcome is −.

Write M in the standard basis.

If M is the Hamiltonian acting on a qubit which is in the state |ψ(0)⟩=|0⟩ at time 0, what is the state of the qubit at time t? Assume that you are working in units such that ℏ=1. You may use e and t in your answer.

Now you perform an X=(0110) measurement on the qubit at time 0. What is the expected value of your measurement?

What if you perform the above measurement at time t=4π3 instead? What is the expected value of your measurement?

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