Multiple choice
Execute the circuit and measure. How likely is the outcome |000⟩?
const c = circuit(3); // Step 1: prepare |+⟩ on qubit 0 c.h(0); // Step 2: Bell pair on qubits 1 and 2 c.h(1); c.cx(1, 2); // Step 3: Bell-basis rotation on Alice's qubits c.cx(0, 1); c.h(0); // Step 4 & 5: deferred-measurement corrections c.cx(1, 2); c.cz(0, 2); return c;
Commit your prediction for P(|000⟩) — then run it.