in qumat/cirq_backend.py [0:0]
def apply_cnot_gate(circuit, control_qubit_index, target_qubit_index):
control_qubit = cirq.LineQubit(control_qubit_index)
target_qubit = cirq.LineQubit(target_qubit_index)
circuit.append(cirq.CNOT(control_qubit, target_qubit))