Show that if $A$ and $B$ are unitary matrices, then $C = A \otimes B$ is unitary.
2026-03-26 18:50:44.1774551044
Prove that the tensor product of unitary matrices is also unitary
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Hint: $(A\otimes B)^{\dagger} = A^\dagger \otimes B^\dagger$, where $A^\dagger$ denotes the conjugate transpose of $A$.