Skip to main content
Advanced3 qubitspar 7

Finish the teleporter

q0 holds an unknown state — here RY(π/4)|0⟩, which reads |1⟩ about 14.6% of the time — and the circuit already entangles q1 with q2, performs the Bell measurement basis change on q0 and q1, and gets as far as that. It stops before the corrections, so q2 currently comes out uniformly random: teleportation without the classical fix-up moves nothing at all. Add the two conditional corrections so that q2 carries the original state. Target: the four bars with q2 = 0 sit at 21.3% and the four with q2 = 1 at 3.7% — that is q2 holding the original 85/15 split while q0 and q1 read uniform noise.

Stuck on the concept? Read Entanglement.

Target
What you are aiming at100 %
|000⟩
|001⟩
|010⟩
|011⟩
|100⟩
|101⟩
|110⟩
|111⟩
Your circuit
What you are producing right now100 %
|000⟩
|001⟩
|010⟩
|011⟩
|100⟩
|101⟩
|110⟩
|111⟩
Gates
Single qubit
Two qubit
Three qubit
Other

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
5
Par
7
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.