Multiple choice
After running this circuit, what is the probability that all 4 qubits together read |0001⟩ (qubit 0 leftmost)?
const c = circuit(4); c.h(0); c.h(1); c.h(2); c.h(3); c.cz(0, 1); c.cz(1, 2); c.cz(2, 3); c.cz(3, 0); return c;
Commit your prediction for P(|0001⟩) — then run it.