Python QuantumCircuit.cx方法代碼示例

# 需要導入模塊: from qiskit import QuantumCircuit [as 別名]
# 或者: from qiskit.QuantumCircuit import cx [as 別名]
    def test_two_unitary_simulator(self):
        """test running two circuits

        This test is similar to one in test_quantumprogram but doesn't use
        multiprocessing.
        """
        qr = QuantumRegister(2)
        cr = ClassicalRegister(1)
        qc1 = QuantumCircuit(qr, cr)
        qc2 = QuantumCircuit(qr, cr)
        qc1.h(qr)
        qc2.cx(qr[0], qr[1])
        backend = UnitarySimulatorPy()
        qobj = compile([qc1, qc2], backend=backend)
        job = backend.run(QuantumJob(qobj, backend=backend, preformatted=True))
        unitary1 = job.result().get_unitary(qc1)
        unitary2 = job.result().get_unitary(qc2)
        unitaryreal1 = np.array([[0.5, 0.5, 0.5, 0.5], [0.5, -0.5, 0.5, -0.5],
                                 [0.5, 0.5, -0.5, -0.5],
                                 [0.5, -0.5, -0.5, 0.5]])
        unitaryreal2 = np.array([[1, 0, 0, 0], [0, 0, 0, 1],
                                 [0., 0, 1, 0], [0, 1, 0, 0]])
        norm1 = np.trace(np.dot(np.transpose(np.conj(unitaryreal1)), unitary1))
        norm2 = np.trace(np.dot(np.transpose(np.conj(unitaryreal2)), unitary2))
        self.assertAlmostEqual(norm1, 4)
        self.assertAlmostEqual(norm2, 4)

# 需要導入模塊: from qiskit import QuantumCircuit [as 別名]
# 或者: from qiskit.QuantumCircuit import cx [as 別名]
 def setUpClass(cls, QE_TOKEN, QE_URL, hub=None, group=None, project=None):
     # pylint: disable=arguments-differ
     super().setUpClass()
     # create QuantumCircuit
     qr = QuantumRegister(2, 'q')
     cr = ClassicalRegister(2, 'c')
     qc = QuantumCircuit(qr, cr)
     qc.h(qr[0])
     qc.cx(qr[0], qr[1])
     qc.measure(qr, cr)
     cls._qc = qc
     cls._provider = LocalProvider(QE_TOKEN, QE_URL, hub, group, project)

# 需要導入模塊: from qiskit import QuantumCircuit [as 別名]
# 或者: from qiskit.QuantumCircuit import cx [as 別名]
    def test_cancel(self):
        """Test the cancelation of jobs.

        Since only Jobs that are still in the executor queue pending to be
        executed can be cancelled, this test launches a lot of jobs, passing
        if some of them can be cancelled.
        """
        # Force the number of workers to 1, as only Jobs that are still in
        # the executor queue can be canceled.
        if sys.platform == 'darwin':
            LocalJob._executor = futures.ThreadPoolExecutor(max_workers=1)
        else:
            LocalJob._executor = futures.ProcessPoolExecutor(max_workers=1)

        backend = self._provider.get_backend('local_qasm_simulator_py')
        num_qubits = 5
        qr = QuantumRegister(num_qubits, 'q')
        cr = ClassicalRegister(num_qubits, 'c')
        qc = QuantumCircuit(qr, cr)
        for i in range(num_qubits-1):
            qc.cx(qr[i], qr[i+1])
        qc.measure(qr, cr)
        qobj = qiskit._compiler.compile(qc, backend)
        quantum_job = QuantumJob(qobj, backend, preformatted=True)
        num_jobs = 10
        timeout = 10
        start_time = time.time()
        self.log.info('testing with simulator: %s', backend.name)
        job_array = [backend.run(quantum_job) for _ in range(num_jobs)]
        for job in job_array:
            job.cancel()
        found_cancelled = False
        while not found_cancelled:
            check = sum([job.cancelled for job in job_array])
            if check >= 1:
                self.log.info('found %d cancelled jobs', check)
                found_cancelled = True
            if all([job.done for job in job_array]):
                self.log.warning('all jobs completed before simultaneous jobs '
                                 'could be detected')
                break
            for job in job_array:
                self.log.info('%s %s %s', job.status['status'], job.cancelled,
                              check)
            self.log.info('{0} {1:0.2f}'.format('-'*20, time.time()-start_time))
            if time.time() - start_time > timeout:
                raise TimeoutError('failed to see multiple running jobs after '
                                   '{0} s'.format(timeout))
            time.sleep(1)

        # Wait for all the jobs to finish.
        _ = [job.result() for job in job_array if not job.cancelled]

# 需要導入模塊: from qiskit import QuantumCircuit [as 別名]
# 或者: from qiskit.QuantumCircuit import cx [as 別名]
    def test_run_async(self):
        if sys.platform == 'darwin':
            LocalJob._executor = futures.ThreadPoolExecutor(max_workers=2)
        else:
            LocalJob._executor = futures.ProcessPoolExecutor(max_workers=2)
        try:
            backend = self._provider.get_backend('local_qasm_simulator_cpp')
        except KeyError:
            backend = self._provider.get_backend('local_qasm_simulator_py')
        num_qubits = 15
        qr = QuantumRegister(num_qubits, 'q')
        cr = ClassicalRegister(num_qubits, 'c')
        qc = QuantumCircuit(qr, cr)
        for i in range(num_qubits-1):
            qc.cx(qr[i], qr[i+1])
        qc.measure(qr, cr)
        qobj = qiskit._compiler.compile(qc, backend)
        quantum_job = QuantumJob(qobj, backend, preformatted=True)
        num_jobs = 5
        job_array = [backend.run(quantum_job) for _ in range(num_jobs)]
        found_async_jobs = False
        timeout = 30
        start_time = time.time()
        self.log.info('testing with simulator: %s', backend.name)
        while not found_async_jobs:
            check = sum([job.running for job in job_array])
            if check >= 2:
                self.log.info('found %d simultaneous jobs', check)
                found_async_jobs = True
            if all([job.done for job in job_array]):
                self.log.warning('all jobs completed before simultaneous jobs '
                                 'could be detected')
                break
            for job in job_array:
                self.log.info('%s %s %s', job.status['status'],
                              job.running, check)
            self.log.info('%s %.4f', '-'*20, time.time()-start_time)
            if time.time() - start_time > timeout:
                raise TimeoutError('failed to see multiple running jobs after '
                                   '{0} s'.format(timeout))
            time.sleep(1)

        # Wait for all the jobs to finish.
        # TODO: this causes the test to wait until the 15 qubit jobs are
        # finished, which might take long (hence the @slow_test). Waiting for
        # the result is needed as otherwise the jobs would still be running
        # once the test is completed, causing failures in subsequent tests as
        # the executor's queue might be overloaded.

        _ = [job.result() for job in job_array]

# 需要導入模塊: from qiskit import QuantumCircuit [as 別名]
# 或者: from qiskit.QuantumCircuit import cx [as 別名]
    def test_run_async_simulator(self):
        IBMQJob._executor = futures.ThreadPoolExecutor(max_workers=2)
        backend = self._provider.get_backend('ibmq_qasm_simulator')
        self.log.info('submitting to backend %s', backend.name)
        num_qubits = 16
        qr = QuantumRegister(num_qubits, 'qr')
        cr = ClassicalRegister(num_qubits, 'cr')
        qc = QuantumCircuit(qr, cr)
        for i in range(num_qubits-1):
            qc.cx(qr[i], qr[i+1])
        qc.measure(qr, cr)
        qobj = qiskit._compiler.compile([qc]*10, backend)
        quantum_job = QuantumJob(qobj, backend, preformatted=True)
        num_jobs = 5
        job_array = [backend.run(quantum_job) for _ in range(num_jobs)]
        found_async_jobs = False
        timeout = 30
        start_time = time.time()
        while not found_async_jobs:
            check = sum([job.running for job in job_array])
            if check >= 2:
                self.log.info('found %d simultaneous jobs', check)
                break
            if all([job.done for job in job_array]):
                # done too soon? don't generate error
                self.log.warning('all jobs completed before simultaneous jobs '
                                 'could be detected')
                break
            for job in job_array:
                self.log.info('%s %s %s %s', job.status['status'], job.running,
                              check, job.job_id)
            self.log.info('-'*20 + ' ' + str(time.time()-start_time))
            if time.time() - start_time > timeout:
                raise TimeoutError('failed to see multiple running jobs after '
                                   '{0} s'.format(timeout))
            time.sleep(0.2)

        result_array = [job.result() for job in job_array]
        self.log.info('got back all job results')
        # Ensure all jobs have finished.
        self.assertTrue(all([job.done for job in job_array]))
        self.assertTrue(all([result.get_status() == 'COMPLETED' for result in result_array]))

        # Ensure job ids are unique.
        job_ids = [job.job_id for job in job_array]
        self.assertEqual(sorted(job_ids), sorted(list(set(job_ids))))

# 需要導入模塊: from qiskit import QuantumCircuit [as 別名]
# 或者: from qiskit.QuantumCircuit import cx [as 別名]
    def test_run_async_device(self):
        backends = self._provider.available_backends({'simulator': False})
        backend = lowest_pending_jobs(backends)
        self.log.info('submitting to backend %s', backend.name)
        num_qubits = 5
        qr = QuantumRegister(num_qubits, 'qr')
        cr = ClassicalRegister(num_qubits, 'cr')
        qc = QuantumCircuit(qr, cr)
        for i in range(num_qubits-1):
            qc.cx(qr[i], qr[i+1])
        qc.measure(qr, cr)
        qobj = qiskit._compiler.compile(qc, backend)
        quantum_job = QuantumJob(qobj, backend, preformatted=True)
        num_jobs = 3
        job_array = [backend.run(quantum_job) for _ in range(num_jobs)]
        time.sleep(3)  # give time for jobs to start (better way?)
        job_status = [job.status['status'] for job in job_array]
        num_init = sum([status == JobStatus.INITIALIZING for status in job_status])
        num_queued = sum([status == JobStatus.QUEUED for status in job_status])
        num_running = sum([status == JobStatus.RUNNING for status in job_status])
        num_done = sum([status == JobStatus.DONE for status in job_status])
        num_error = sum([status == JobStatus.ERROR for status in job_status])
        self.log.info('number of currently initializing jobs: %d/%d',
                      num_init, num_jobs)
        self.log.info('number of currently queued jobs: %d/%d',
                      num_queued, num_jobs)
        self.log.info('number of currently running jobs: %d/%d',
                      num_running, num_jobs)
        self.log.info('number of currently done jobs: %d/%d',
                      num_done, num_jobs)
        self.log.info('number of errored jobs: %d/%d',
                      num_error, num_jobs)
        self.assertTrue(num_jobs - num_error - num_done > 0)

        # Wait for all the results.
        result_array = [job.result() for job in job_array]

        # Ensure all jobs have finished.
        self.assertTrue(all([job.done for job in job_array]))
        self.assertTrue(all([result.get_status() == 'COMPLETED' for result in result_array]))

        # Ensure job ids are unique.
        job_ids = [job.job_id for job in job_array]
        self.assertEqual(sorted(job_ids), sorted(list(set(job_ids))))

# 需要導入模塊: from qiskit import QuantumCircuit [as 別名]
# 或者: from qiskit.QuantumCircuit import cx [as 別名]
 def test_initialize_middle_circuit(self):
     desired_vector = [0.5, 0.5, 0.5, 0.5]
     qr = QuantumRegister(2, "qr")
     cr = ClassicalRegister(2, "cr")
     qc = QuantumCircuit(qr, cr)
     qc.h(qr[0])
     qc.cx(qr[0], qr[1])
     qc.reset(qr[0])
     qc.reset(qr[1])
     qc.initialize(desired_vector, [qr[0], qr[1]])
     qc.measure(qr, cr)
     # statevector simulator does not support reset
     shots = 2000
     threshold = 0.04 * shots
     job = wrapper.execute(qc, 'local_qasm_simulator', shots=shots)
     result = job.result()
     counts = result.get_counts()
     target = {'00': shots / 4, '01': shots / 4, '10': shots / 4, '11': shots / 4}
     self.assertDictAlmostEqual(counts, target, threshold)

# 需要導入模塊: from qiskit import QuantumCircuit [as 別名]
# 或者: from qiskit.QuantumCircuit import cx [as 別名]
    def test_entangle(self):
        shots = 100
        N = 5
        qr = QuantumRegister(N)
        cr = ClassicalRegister(N)
        qc = QuantumCircuit(qr, cr, name='test_entangle')

        qc.h(qr[0])
        for i in range(1, N):
            qc.cx(qr[0], qr[i])
        qc.measure(qr, cr)
        qobj = qiskit._compiler.compile([qc], pq_simulator, shots=shots)
        timeout = 30
        q_job = QuantumJob(qobj, pq_simulator, preformatted=True,
                           resources={'max_credits': qobj['config']['max_credits']})
        job = pq_simulator.run(q_job)
        result = job.result(timeout=timeout)
        counts = result.get_counts(result.get_names()[0])
        self.log.info(counts)
        for key, _ in counts.items():
            with self.subTest(key=key):
                self.assertTrue(key in ['0' * N, '1' * N])

# 需要導入模塊: from qiskit import QuantumCircuit [as 別名]
# 或者: from qiskit.QuantumCircuit import cx [as 別名]
 def test_cancel(self):
     if not self._using_hub:
         self.skipTest('job cancellation currently only available on hubs')
     backends = self._provider.available_backends({'simulator': False})
     self.log.info('devices: %s', [b.name for b in backends])
     backend = backends[0]
     self.log.info('using backend: %s', backend.name)
     num_qubits = 5
     qr = QuantumRegister(num_qubits, 'qr')
     cr = ClassicalRegister(num_qubits, 'cr')
     qc = QuantumCircuit(qr, cr)
     for i in range(num_qubits-1):
         qc.cx(qr[i], qr[i+1])
     qc.measure(qr, cr)
     qobj = qiskit._compiler.compile(qc, backend)
     quantum_job = QuantumJob(qobj, backend, preformatted=True)
     num_jobs = 3
     job_array = [backend.run(quantum_job) for _ in range(num_jobs)]
     success = False
     self.log.info('jobs submitted: %s', num_jobs)
     while any([job.status['status'] == JobStatus.INITIALIZING for job in job_array]):
         self.log.info('jobs initializing')
         time.sleep(1)
     for job in job_array:
         job.cancel()
     while not success:
         job_status = [job.status for job in job_array]
         for status in job_status:
             self.log.info(status)
         if any([status['status'] == JobStatus.CANCELLED for status in job_status]):
             success = True
         if all([status['status'] == JobStatus.DONE for status in job_status]):
             raise IBMQJobError('all jobs completed before any could be cancelled')
         self.log.info('-' * 20)
         time.sleep(2)
     self.assertTrue(success)

# 需要導入模塊: from qiskit import QuantumCircuit [as 別名]
# 或者: from qiskit.QuantumCircuit import cx [as 別名]
                     for backend in list_of_backends]

    best = min([x for x in device_status if x['available'] is True],
               key=lambda x: x['pending_jobs'])
    return best['name']


try:
    # Create a Quantum and Classical Register and giving a name.
    qubit_reg = QuantumRegister(2, name='q')
    clbit_reg = ClassicalRegister(2, name='c')

    # Making first circuit: bell state
    qc1 = QuantumCircuit(qubit_reg, clbit_reg, name="bell")
    qc1.h(qubit_reg[0])
    qc1.cx(qubit_reg[0], qubit_reg[1])
    qc1.measure(qubit_reg, clbit_reg)

    # Making another circuit: superpositions
    qc2 = QuantumCircuit(qubit_reg, clbit_reg, name="superposition")
    qc2.h(qubit_reg)
    qc2.measure(qubit_reg, clbit_reg)

    # Setting up the backend
    print("(Local Backends)")
    for backend_name in available_backends({'local': True}):
        backend = get_backend(backend_name)
        print(backend.status)
    my_backend_name = 'local_qasm_simulator'
    my_backend = get_backend(my_backend_name)
    print("(Local QASM Simulator configuration) ")

# 需要導入模塊: from qiskit import QuantumCircuit [as 別名]
# 或者: from qiskit.QuantumCircuit import cx [as 別名]

#.........這裏部分代碼省略.........
        self.assertStmtsType(instruction_set.instructions, Cu3Gate)
        self.assertQasm(qasm_txt)

    def test_cu3_reg_reg_inv(self):
        qasm_txt = 'cu3(-1,-3,-2) q[0],r[0];\ncu3(-1,-3,-2) q[1],r[1];\ncu3(-1,-3,-2) q[2],r[2];'
        instruction_set = self.circuit.cu3(1, 2, 3, self.q, self.r).inverse()
        self.assertStmtsType(instruction_set.instructions, Cu3Gate)
        self.assertQasm(qasm_txt)

    def test_cu3_reg_bit(self):
        qasm_txt = 'cu3(1,2,3) q[0],r[1];\ncu3(1,2,3) q[1],r[1];\ncu3(1,2,3) q[2],r[1];'
        instruction_set = self.circuit.cu3(1, 2, 3, self.q, self.r[1])
        self.assertStmtsType(instruction_set.instructions, Cu3Gate)
        self.assertQasm(qasm_txt)

    def test_cu3_reg_bit_inv(self):
        qasm_txt = 'cu3(-1,-3,-2) q[0],r[1];\ncu3(-1,-3,-2) q[1],r[1];\ncu3(-1,-3,-2) q[2],r[1];'
        instruction_set = self.circuit.cu3(1, 2, 3, self.q, self.r[1]).inverse()
        self.assertStmtsType(instruction_set.instructions, Cu3Gate)
        self.assertQasm(qasm_txt)

    def test_cu3_bit_reg(self):
        qasm_txt = 'cu3(1,2,3) q[1],r[0];\ncu3(1,2,3) q[1],r[1];\ncu3(1,2,3) q[1],r[2];'
        instruction_set = self.circuit.cu3(1, 2, 3, self.q[1], self.r)
        self.assertStmtsType(instruction_set.instructions, Cu3Gate)
        self.assertQasm(qasm_txt)

    def test_cu3_bit_reg_inv(self):
        qasm_txt = 'cu3(-1,-3,-2) q[1],r[0];\ncu3(-1,-3,-2) q[1],r[1];\ncu3(-1,-3,-2) q[1],r[2];'
        instruction_set = self.circuit.cu3(1, 2, 3, self.q[1], self.r).inverse()
        self.assertStmtsType(instruction_set.instructions, Cu3Gate)
        self.assertQasm(qasm_txt)

    def test_cx_reg_reg(self):
        qasm_txt = 'cx q[0],r[0];\ncx q[1],r[1];\ncx q[2],r[2];'
        instruction_set = self.circuit.cx(self.q, self.r)
        self.assertStmtsType(instruction_set.instructions, CnotGate)
        self.assertQasm(qasm_txt)

    def test_cx_reg_reg_inv(self):
        qasm_txt = 'cx q[0],r[0];\ncx q[1],r[1];\ncx q[2],r[2];'
        instruction_set = self.circuit.cx(self.q, self.r).inverse()
        self.assertStmtsType(instruction_set.instructions, CnotGate)
        self.assertQasm(qasm_txt)

    def test_cx_reg_bit(self):
        qasm_txt = 'cx q[0],r[1];\ncx q[1],r[1];\ncx q[2],r[1];'
        instruction_set = self.circuit.cx(self.q, self.r[1])
        self.assertStmtsType(instruction_set.instructions, CnotGate)
        self.assertQasm(qasm_txt)

    def test_cx_reg_bit_inv(self):
        qasm_txt = 'cx q[0],r[1];\ncx q[1],r[1];\ncx q[2],r[1];'
        instruction_set = self.circuit.cx(self.q, self.r[1]).inverse()
        self.assertStmtsType(instruction_set.instructions, CnotGate)
        self.assertQasm(qasm_txt)

    def test_cx_bit_reg(self):
        qasm_txt = 'cx q[1],r[0];\ncx q[1],r[1];\ncx q[1],r[2];'
        instruction_set = self.circuit.cx(self.q[1], self.r)
        self.assertStmtsType(instruction_set.instructions, CnotGate)
        self.assertQasm(qasm_txt)

    def test_cx_bit_reg_inv(self):
        qasm_txt = 'cx q[1],r[0];\ncx q[1],r[1];\ncx q[1],r[2];'
        instruction_set = self.circuit.cx(self.q[1], self.r).inverse()

# 需要導入模塊: from qiskit import QuantumCircuit [as 別名]
# 或者: from qiskit.QuantumCircuit import cx [as 別名]
class TestStandard1Q(StandardExtensionTest):
    """Standard Extension Test. Gates with a single Qubit"""

    def setUp(self):
        self.q = QuantumRegister(3, "q")
        self.r = QuantumRegister(3, "r")
        self.c = ClassicalRegister(3, "c")
        self.circuit = QuantumCircuit(self.q, self.r, self.c)
        self.c_header = 69  # lenght of the header

    def test_barrier(self):
        self.circuit.barrier(self.q[1])
        qasm_txt = 'barrier q[1];'
        self.assertResult(Barrier, qasm_txt, qasm_txt)

    def test_barrier_invalid(self):
        c = self.circuit
        self.assertRaises(QISKitError, c.barrier, self.c[0])
        self.assertRaises(QISKitError, c.barrier, self.c)
        self.assertRaises(QISKitError, c.barrier, (self.q, 3))
        self.assertRaises(QISKitError, c.barrier, (self.q, 'a'))
        self.assertRaises(QISKitError, c.barrier, 0)

    def test_barrier_reg(self):
        self.circuit.barrier(self.q)
        qasm_txt = 'barrier q[0],q[1],q[2];'
        self.assertResult(Barrier, qasm_txt, qasm_txt)

    def test_barrier_None(self):
        self.circuit.barrier()
        qasm_txt = 'barrier q[0],q[1],q[2],r[0],r[1],r[2];'
        self.assertResult(Barrier, qasm_txt, qasm_txt)

    def test_ccx(self):
        self.circuit.ccx(self.q[0], self.q[1], self.q[2])
        qasm_txt = 'ccx q[0],q[1],q[2];'
        self.assertResult(ToffoliGate, qasm_txt, qasm_txt)

    def test_ccx_invalid(self):
        c = self.circuit
        self.assertRaises(QISKitError, c.ccx, self.c[0], self.c[1], self.c[2])
        self.assertRaises(QISKitError, c.ccx, self.q[0], self.q[0], self.q[2])
        self.assertRaises(QISKitError, c.ccx, 0, self.q[0], self.q[2])
        self.assertRaises(QISKitError, c.ccx, (self.q, 3), self.q[1], self.q[2])
        self.assertRaises(QISKitError, c.ccx, self.c, self.q, self.q)
        self.assertRaises(QISKitError, c.ccx, 'a', self.q[1], self.q[2])

    def test_ch(self):
        self.circuit.ch(self.q[0], self.q[1])
        qasm_txt = 'ch q[0],q[1];'
        self.assertResult(CHGate, qasm_txt, qasm_txt)

    def test_ch_invalid(self):
        c = self.circuit
        self.assertRaises(QISKitError, c.ch, self.c[0], self.c[1])
        self.assertRaises(QISKitError, c.ch, self.q[0], self.q[0])
        self.assertRaises(QISKitError, c.ch, 0, self.q[0])
        self.assertRaises(QISKitError, c.ch, (self.q, 3), self.q[0])
        self.assertRaises(QISKitError, c.ch, self.c, self.q)
        self.assertRaises(QISKitError, c.ch, 'a', self.q[1])

    def test_crz(self):
        self.circuit.crz(1, self.q[0], self.q[1])
        self.assertResult(CrzGate, 'crz(1) q[0],q[1];', 'crz(-1) q[0],q[1];')

    def test_crz_invalid(self):
        c = self.circuit
        self.assertRaises(QISKitError, c.crz, 0, self.c[0], self.c[1])
        self.assertRaises(QISKitError, c.crz, 0, self.q[0], self.q[0])
        self.assertRaises(QISKitError, c.crz, 0, 0, self.q[0])
        # TODO self.assertRaises(QISKitError, c.crz, self.q[2], self.q[1], self.q[0])
        self.assertRaises(QISKitError, c.crz, 0, self.q[1], self.c[2])
        self.assertRaises(QISKitError, c.crz, 0, (self.q, 3), self.q[1])
        self.assertRaises(QISKitError, c.crz, 0, self.c, self.q)
        # TODO self.assertRaises(QISKitError, c.crz, 'a', self.q[1], self.q[2])

    def test_cswap(self):
        self.circuit.cswap(self.q[0], self.q[1], self.q[2])
        qasm_txt = 'cx q[2],q[1];\nccx q[0],q[1],q[2];\ncx q[2],q[1];'
        self.assertResult(FredkinGate, qasm_txt, qasm_txt)

    def test_cswap_invalid(self):
        c = self.circuit
        self.assertRaises(QISKitError, c.cswap, self.c[0], self.c[1], self.c[2])
        self.assertRaises(QISKitError, c.cswap, self.q[1], self.q[0], self.q[0])
        self.assertRaises(QISKitError, c.cswap, self.q[1], 0, self.q[0])
        self.assertRaises(QISKitError, c.cswap, self.c[0], self.c[1], self.q[0])
        self.assertRaises(QISKitError, c.cswap, self.q[0], self.q[0], self.q[1])
        self.assertRaises(QISKitError, c.cswap, 0, self.q[0], self.q[1])
        self.assertRaises(QISKitError, c.cswap, (self.q, 3), self.q[0], self.q[1])
        self.assertRaises(QISKitError, c.cswap, self.c, self.q[0], self.q[1])
        self.assertRaises(QISKitError, c.cswap, 'a', self.q[1], self.q[2])

    def test_cu1(self):
        self.circuit.cu1(1, self.q[1], self.q[2])
        self.assertResult(Cu1Gate, 'cu1(1) q[1],q[2];', 'cu1(-1) q[1],q[2];')

    def test_cu1_invalid(self):
        c = self.circuit
        self.assertRaises(QISKitError, c.cu1, self.c[0], self.c[1], self.c[2])
#.........這裏部分代碼省略.........

# 需要導入模塊: from qiskit import QuantumCircuit [as 別名]
# 或者: from qiskit.QuantumCircuit import cx [as 別名]
class CircuitBackend(UnrollerBackend):
    """Backend for the unroller that produces a QuantumCircuit.

    By default, basis gates are the QX gates.
    """

    def __init__(self, basis=None):
        """Setup this backend.

        basis is a list of operation name strings.
        """
        super().__init__(basis)
        self.creg = None
        self.cval = None
        if basis:
            self.basis = basis
        else:
            self.basis = ["cx", "u1", "u2", "u3"]
        self.gates = {}
        self.listen = True
        self.in_gate = ""
        self.circuit = QuantumCircuit()

    def set_basis(self, basis):
        """Declare the set of user-defined gates to emit.

        basis is a list of operation name strings.
        """
        self.basis = basis

    def version(self, version):
        """Ignore the version string.

        v is a version number.
        """
        pass

    def new_qreg(self, name, size):
        """Create a new quantum register.

        name = name of the register
        sz = size of the register
        """
        assert size >= 0, "invalid qreg size"
        q_register = QuantumRegister(size, name)
        self.circuit.add(q_register)

    def new_creg(self, name, size):
        """Create a new classical register.

        name = name of the register
        sz = size of the register
        """
        assert size >= 0, "invalid creg size"
        c_register = ClassicalRegister(size, name)
        self.circuit.add(c_register)

    def define_gate(self, name, gatedata):
        """Define a new quantum gate.

        We don't check that the definition and name agree.

        name is a string.
        gatedata is the AST node for the gate.
        """
        self.gates[name] = gatedata

    def _map_qubit(self, qubit):
        """Map qubit tuple (regname, index) to (QuantumRegister, index)."""
        qregs = self.circuit.get_qregs()
        if qubit[0] not in qregs:
            raise BackendError("qreg %s does not exist" % qubit[0])
        return (qregs[qubit[0]], qubit[1])

    def _map_bit(self, bit):
        """Map bit tuple (regname, index) to (ClassicalRegister, index)."""
        cregs = self.circuit.get_cregs()
        if bit[0] not in cregs:
            raise BackendError("creg %s does not exist" % bit[0])
        return (cregs[bit[0]], bit[1])

    def _map_creg(self, creg):
        """Map creg name to ClassicalRegister."""
        cregs = self.circuit.get_cregs()
        if creg not in cregs:
            raise BackendError("creg %s does not exist" % creg)
        return cregs[creg]

    def u(self, arg, qubit, nested_scope=None):
        """Fundamental single qubit gate.

        arg is 3-tuple of Node expression objects.
        qubit is (regname,idx) tuple.
        nested_scope is a list of dictionaries mapping expression variables
        to Node expression objects in order of increasing nesting depth.
        """
        if self.listen:
            if "U" not in self.basis:
                self.basis.append("U")

#.........這裏部分代碼省略.........

# 需要導入模塊: from qiskit import QuantumCircuit [as 別名]
# 或者: from qiskit.QuantumCircuit import cx [as 別名]

def unmajority(p, a, b, c):
    """Unmajority gate."""
    p.ccx(a, b, c)
    p.cx(c, a)
    p.cx(a, b)


# Build a temporary subcircuit that adds a to b,
# storing the result in b
adder_subcircuit = QuantumCircuit(cin, a, b, cout)
majority(adder_subcircuit, cin[0], b[0], a[0])
for j in range(n - 1):
    majority(adder_subcircuit, a[j], b[j + 1], a[j + 1])
adder_subcircuit.cx(a[n - 1], cout[0])
for j in reversed(range(n - 1)):
    unmajority(adder_subcircuit, a[j], b[j + 1], a[j + 1])
unmajority(adder_subcircuit, cin[0], b[0], a[0])

# Set the inputs to the adder
qc.x(a[0])  # Set input a = 0...0001
qc.x(b)   # Set input b = 1...1111
# Apply the adder
qc += adder_subcircuit
# Measure the output register in the computational basis
for j in range(n):
    qc.measure(b[j], ans[j])
qc.measure(cout[0], ans[n])

###############################################################

# 需要導入模塊: from qiskit import QuantumCircuit [as 別名]
# 或者: from qiskit.QuantumCircuit import cx [as 別名]
               key=lambda x: x['pending_jobs'])
    return best['name']

try:
    # Create a Quantum Register with 2 qubits.
    q = QuantumRegister(2)
    # Create a Classical Register with 2 bits.
    c = ClassicalRegister(2)
    # Create a Quantum Circuit
    qc = QuantumCircuit(q, c)

    # Add a H gate on qubit 0, putting this qubit in superposition.
    qc.h(q[0])
    # Add a CX (CNOT) gate on control qubit 0 and target qubit 1, putting
    # the qubits in a Bell state.
    qc.cx(q[0], q[1])
    # Add a Measure gate to see the state.
    qc.measure(q, c)

    # See a list of available local simulators
    print("Local backends: ", available_backends({'local': True}))

    # Compile and run the Quantum circuit on a simulator backend
    job_sim = execute(qc, "local_qasm_simulator")
    sim_result = job_sim.result()

    # Show the results
    print("simulation: ", sim_result)
    print(sim_result.get_counts(qc))

    # see a list of available remote backends