Multiple choice
For qubit 0 after this circuit, what is ⟨X⟩, the X-axis projection of its Bloch vector?
// H is unitary, so H|0> = (|0> + |1>)/sqrt(2) has norm 1, like |0> did. const c = circuit(1); c.h(0); return c;
Commit your prediction for ⟨X⟩ of qubit 0 — then run it.