def test_two_bit_adder(self, a, b, length):
log.info("Testing 'DraperAdder' with a=%d(%s), b=%d(%s).", a,
"{0:b}".format(a), b, "{0:b}".format(b))
length = dc_qiskit_algorithms.DraperAdderGate.compute_length(
a, b, length)
qubit_a = QuantumRegister(length, "a")
qubit_b = QuantumRegister(length, "b")
readout_a = ClassicalRegister(length, "c_a")
readout_b = ClassicalRegister(length, "c_b")
qc = QuantumCircuit(qubit_a,
qubit_b,
readout_a,
readout_b,
name="draper adder")
qc.add_draper(a, b, list(qubit_a) + list(qubit_b), length)
qc.measure(qubit_a, readout_a)
qc.measure(qubit_b, readout_b)
backend = qiskit.Aer.get_backend('qasm_simulator') # type: AerBackend
job = qiskit.execute(qc, backend, shots=8192)
counts = job.result().get_counts()
result_list = [{
'b': k[::-1].split(' ')[1],
'a': k[::-1].split(' ')[0],
'counts': v
} for k, v in counts.items()]
log.info(result_list)
self.assertEqual(len(result_list), 1)
data = result_list[0] # type: dict
self.assertEqual(int(data['b'], 2), b, "Register b must be unchanged!")
self.assertEqual(int(data['a'], 2), (a + b) % 2**length,
"Addition must be correctly performed!")
