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Mr confusion
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- 1
Homework Statement
to prove : square of density matrix= the density matrix itself (for a pure ensemble)
Homework Equations
density matrix=sum over P(i) ket(i) bra(i) where Pi = probability that random chosen system from ensemble shows state i.
summed over i , where P=1 for pure ensemble
The Attempt at a Solution
i thought it is giving the identity matrix, whose square is also I , hence the proof. but i am not sure about this.
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