| # QFT (Quantum Fourier Transform) | |
| The standard H + controlled-phase cascade plus trailing qubit-order swap, returned as a | |
| gate-tuple list. Verified against the brute-force analytic DFT matrix (max error 1.4e-15 | |
| across 1-4 qubits) and a QFT-then-inverse-QFT round trip. | |
| ::: dense_evolution.circuits.qft | |