Quantum Mechanics: Concepts and Applications · Problem 2.16

Mathematical Tools of Quantum Mechanics — Nouredine Zettili

Physics — Quantum Mechanics · unitary-transformation-matrix

Problem

Let

\hat{U}

be a transformation matrix which connects two complete and orthonormal bases

\{|\phi_n\rangle\}

and

\{|\phi'_n\rangle\}

. Show that

U

is unitary.