Multiple choice
Run this circuit, then measure all 3 qubits at once. What is the probability of the joint outcome |101⟩ (qubit 0 leftmost)?
const gamma = 3 * Math.PI / 4; const beta = Math.PI / 8; const c = circuit(3); // Step 1: equal superposition c.h(0); c.h(1); c.h(2); // Step 2: cost unitary — edge (0,1) c.cx(0, 1); c.rz(2 * gamma, 1); c.cx(0, 1); // Step 3: cost unitary — edge (1,2) c.cx(1, 2); c.rz(2 * gamma, 2); c.cx(1, 2); // Step 4: mixer c.rx(2 * beta, 0); c.rx(2 * beta, 1); c.rx(2 * beta, 2); // Step 5: measure c.measure(); return c;
Commit your prediction for P(|101⟩) — then run it.