One full turn of Grover
Search eight items for the marked one, by hand. Mark |111⟩ with a phase, then run one full diffusion step, so the histogram reads 78.1% on |111⟩ and 3.1% on each of the other seven. That 78.1% is the point: one iteration out of the two that N = 8 wants, and the number is the fingerprint of having actually amplified rather than just written the answer down. Par is 21 gates — this is the longest circuit in the catalogue and it is meant to be.
Stuck on the concept? Read Grover's Search.
Select a gate to see what it does, then tap a wire — or Tab to a wire and press Enter — to place it.
Pick a gate, then tap a cell — or Tab into the grid and use the arrow keys and Enter — to place it.
Generate a fresh target distribution drill at this difficulty. Every generated puzzle is verified solvable by execution before you see it — the generator runs its own solution through the same simulator and grader that will judge yours.