Multiple choice
For this circuit, what is the probability that measuring all 3 qubits yields exactly |111⟩ (qubit 0 leftmost)?
// H on qubit 0 makes (|0> + |1>)/sqrt2 on the first qubit; // CNOT(0->1) and CNOT(0->2) entangle the rest, giving (|000> + |111>)/sqrt2. const c = circuit(3); c.h(0); c.cx(0, 1); c.cx(0, 2); return c;
Commit your prediction for P(|111⟩) — then run it.