348-problem17 - A . Unitary transformations preserve...

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Chem. 540 Instructor: Nancy Makri PROBLEM 17 Unitary operators play a very important role in quantum mechanics. If ˆ U is a unitary op- erator, the operator ˆ ˆ ˆ U AU + is called a unitary transformation of ˆ
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Unformatted text preview: A . Unitary transformations preserve important properties of operators. By using an arbitrary basis { } n , show that the trace of an operator is invariant under a unitary transformation....
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