Multiple choice
This circuit prepares qubit 0 in some state. What expectation value ⟨X⟩ does it have along the Bloch X-axis?
const c = circuit(3); c.x(0); c.h(1); c.cx(1, 2); c.cx(0, 1); c.h(0); c.cx(1, 2); c.cz(0, 2); return c;
Commit your prediction for ⟨X⟩ of qubit 0 — then run it.