Multiple choice
This circuit prepares qubit 0 in some state. What expectation value ⟨Y⟩ does it have along the Bloch Y-axis?
const phi = 1.1; const c = circuit(1); c.rx(phi, 0); // input |psi> c.x(0); // byproduct X^s, s = 1 c.x(0); // feed-forward correction X^s, s = 1 (X is its own inverse) return c;
Commit your prediction for ⟨Y⟩ of qubit 0 — then run it.