Quantum XOR Gate

quantum_xor.py

def xor_gate(bit1, bit2, backend='sim', token=None):
    assert bit1 in (0, 1) and bit2 in (0, 1), "Only 0 or 1"
    quantumBits = 2
    classicalBits = 1
    XOR = QuantumCircuit(quantumBits, classicalBits)

    if bit1 == 1:
        XOR.x(0)
    if bit2 == 1:
        XOR.x(1)
    XOR.barrier()

    XOR.cx(0, 1)

    XOR.barrier()
    XOR.measure([1], [0])

    if backend == 'sim':
        sim = Aer.get_backend('qasm_simulator')
        result = execute(XOR, backend=sim, shots=1).result()

    elif backend == 'real':
        IBMQ.delete_account()
        IBMQ.save_account(token, overwrite=True)
        IBMQ.load_account()
        # execute on real quantum computer
        provider = IBMQ.get_provider('ibm-q')
        qcomp = provider.get_backend('ibmq_16_melbourne')
        job = execute(XOR, backend=qcomp)
        result = job.result()  # get result from real quantum computer

    counts = result.get_counts()
    value = max(counts, key=counts.get)
    return value