  We observe how an active (i.e., requring $2^n$ parallel control operations)
QRAM-like effect $$\sum_{y=0}^{N-1} |y\rangle\langle y| \otimes
U^y_{\text{result},\text{memory}_y}$$ can be realized, as a quantum circuit of
depth $O(n+\sqrt m)$ (where $m$ is the size of the result register) plus the
maximum over all~$z$ of the circuit depths of controlled-$U^z$ operations.
