Multiple choice
Run this circuit, then measure all 2 qubits at once. What is the probability of the joint outcome |01⟩ (qubit 0 leftmost)?
const beta = Math.PI / 4; const c = circuit(2); c.rx(2 * beta, 0); c.rx(2 * beta, 1); return c;
Commit your prediction for P(|01⟩) — then run it.