意外关键字参数'noise_model‘

Question

下面的代码引发一个错误。基于我在qiskit github上读到的一些问题，它似乎与运行信任与编译信任有关，但我找不到任何其他信息来帮助我解决这个问题。

from qiskit import QuantumCircuit, IBMQ, execute
from qiskit import BasicAer as Aer
from qiskit.providers.aer import noise


ckt = QuantumCircuit(2, 2)
ckt.h(0)
ckt.cx(0, 1)
ckt.measure(0, 0)
ckt.measure(1, 1)

qsim = Aer.get_backend("qasm_simulator")

IBMQ.load_account()
provider = IBMQ.get_provider(hub="ibm-q")
qc = provider.get_backend("ibmqx2")

props = qc.properties()
coupling_map = qc.configuration().coupling_map
noise_model = noise.device.basic_device_noise_model(props)

job = execute(
    ckt, 
    qsim, 
    noise_model=noise_model, 
    coupling_map=coupling_map, 
    basis_gates=noise_model.basis_gates
)

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-1-2f987d65d1f7> in <module>
     25     noise_model=noise_model,
     26     coupling_map=coupling_map,
---> 27     basis_gates=noise_model.basis_gates
     28 )

~/.venvs/qk/lib/python3.7/site-packages/qiskit/execute.py in execute(experiments, backend, basis_gates, coupling_map, backend_properties, initial_layout, seed_transpiler, optimization_level, pass_manager, qobj_id, qobj_header, shots, memory, max_credits, seed_simulator, default_qubit_los, default_meas_los, schedule_los, meas_level, meas_return, memory_slots, memory_slot_size, rep_time, parameter_binds, **run_config)
    220 
    221     # executing the circuits on the backend and returning the job
--> 222     return backend.run(qobj, **run_config)

TypeError: run() got an unexpected keyword argument 'noise_model'

环境规划署：

• macOS 10.14.6
• Python 3.7.3
• qiskit 0.12.0

Answer 1

出现了错误，因为您正在使用BasicAer检索模拟器后端。我认为这将不适用于BasicAer提供程序。您应该使用Aer提供程序。

from qiskit import Aer
qsim = Aer.get_backend('qasm_simulator')

如果您只是将导入语句从

from qiskit import BasicAer as Aer

至

from qiskit import Aer

那么您的代码就可以工作了。