Multiple choice
This circuit prepares qubit 0 in some state. What expectation value ⟨X⟩ does it have along the Bloch X-axis?
const s = 0.5; // Ground state of H(s) = -(1-s)X - sZ has Bloch vector along (1-s, 0, s). // RY(theta)|0> produces Bloch (sin theta, 0, cos theta), so: const theta = Math.atan2(1 - s, s); const c = circuit(1); c.ry(theta, 0); return c;
Commit your prediction for ⟨X⟩ of qubit 0 — then run it.