Multiple choice
For qubit 0 after this circuit, what is ⟨X⟩, the X-axis projection of its Bloch vector?
const c = circuit(2); c.h(0); c.h(1); c.cx(0, 1); c.rz(-Math.PI / 4, 1); c.cx(0, 1); return c;
Commit your prediction for ⟨X⟩ of qubit 0 — then run it.