Multiple choice
This circuit prepares qubit 0 in some state. What expectation value ⟨Y⟩ does it have along the Bloch Y-axis?
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 ⟨Y⟩ of qubit 0 — then run it.