Predict the output
On the seeded simulator (seed 3130), this circuit runs for 1024 shots. About how many come out |0000⟩? Estimate P(|0000⟩) × 1024 and pick the closest option.
const c = circuit(4); c.h(0); c.cx(0, 1); c.h(2); c.cx(2, 3); // Bell-state measurement on the repeater qubits: undo the entangler. c.cx(1, 2); c.h(1); // Feed-forward corrections onto Bob's qubit (deferred-measurement form): c.cx(2, 3); // X correction conditioned on q2 c.cz(1, 3); // Z correction conditioned on q1 c.measure(); return c;
Commit your prediction for counts of |0000⟩ over 1024 shots — then run it.