Density operator Sample Clauses

Density operator. An imperfect preparation of the state of a quantum system implies that the quantum system becomes a mixture of several states |ψi) with different probabilities pi. Then one uses the description of the density operator or density matrix ρ which is calculated over the outer product of each possible state weighted by its probability of occurrence: . ρ = pi|ψi)(ψi| (B.6) This matrix representation of a system helps us to describe side-effects of noise in the chan- nel. Now we can state that a valid density operator has to satisfiy the two conditions:
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