This circuit was meant to leave the qubit exactly where it started — H, then H again, is the identity. Someone slipped an extra gate into the middle and now it lands on |1⟩ every time. Repair it: |0⟩ with certainty. Click a placed gate to remove it.
Select a gate to see what it does, then tap a wire — or Tab to a wire and press Enter — to place it.
Circuit
Gates
3
Par
2
Pick a gate from the palette to start building.
Practice more like this
Generate a fresh fix the bug 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.