const c = circuit(5);
c.x(1); // injected bit-flip error on data qubit 1
// Stabilizer g1 = Z0 Z1 -> ancilla 3 (parity of qubits 0 and 1)
c.cx(0, 3);
c.cx(1, 3);
// Stabilizer g2 = Z1 Z2 -> ancilla 4 (parity of qubits 1 and 2)
c.cx(1, 4);
c.cx(2, 4);
c.measure();
return c;