A proposed n-qubit Gaussian state-preparation circuit uses exactly n-1 rotations, (n-1)(n-2)/2 controlled rotations, floor((n-1)/2) ancilla, and is optimized to linear T-depth.
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A simpler Gaussian state-preparation
A proposed n-qubit Gaussian state-preparation circuit uses exactly n-1 rotations, (n-1)(n-2)/2 controlled rotations, floor((n-1)/2) ancilla, and is optimized to linear T-depth.