Multiple choice
This circuit prepares qubit 0 in some state. What expectation value ⟨Y⟩ does it have along the Bloch Y-axis?
const c = circuit(2); const t = Math.PI / 4; c.cx(0, 1); c.rz(2 * t, 1); c.cx(0, 1); c.rx(2 * t, 0); return c;
Commit your prediction for ⟨Y⟩ of qubit 0 — then run it.