Suppose I have a density matrix ρ and I act on it with a unitary matrix that is chosen randomly, and with even probability, from S={H1,H2…HN}. I want to write the operation on the density matrix in Krauss form:
ρ′=∑iOiρO†i
Since the operator is chosen evenly, the probability of choosing any Hi is 1N. What would be my choices for Oi?
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