The two gates already on the wire prepare |+i⟩ = (|0⟩ + i|1⟩)/√2 — a state that is perfectly definite along the Y axis and a coin flip along Z. Your detector only measures Z. Add gates so the circuit reads |1⟩ on every single shot, without deleting the preparation.
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
2
Par
4
Pick a gate from the palette to start building.
Practice more like this
Generate a fresh target state 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.