如何在IBM Qiskit Runtime的Estimator/Sampler中设置rep_delay

可以在Estimator或Sampler原语中设置rep_delay，但不能直接将其作为run()方法的参数传递，需要把它放到原语的options参数的execution子字典中。

正确的Sampler示例代码 #

from qiskit_ibm_runtime import Estimator, Session, QiskitRuntimeService, Sampler
from qiskit.circuit.library import RealAmplitudes

circuit = RealAmplitudes(num_qubits=2, reps=2)
service = QiskitRuntimeService(channel="ibm_cloud", token=API_Key_my, instance=crn_pay)

backend = {0:"ibm_algiers",1:"ibmq_qasm_simulator",2:"ibmq_manila"}[0]
with Session(service=service, backend=backend):
    # 将rep_delay放入execution选项中
    sampler = Sampler(options={"shots": 2048, "execution": {"rep_delay": 0.00001}})
    job = sampler.run(circuit)

正确的Estimator示例代码 #

如果使用Estimator，逻辑完全一致：

from qiskit_ibm_runtime import Estimator, Session, QiskitRuntimeService
from qiskit.circuit.library import RealAmplitudes
from qiskit.quantum_info import SparsePauliOp

circuit = RealAmplitudes(num_qubits=2, reps=2)
observable = SparsePauliOp.from_list([("ZZ", 1)])
service = QiskitRuntimeService(channel="ibm_cloud", token=API_Key_my, instance=crn_pay)

backend = {0:"ibm_algiers",1:"ibmq_qasm_simulator",2:"ibmq_manila"}[0]
with Session(service=service, backend=backend):
    estimator = Estimator(options={"shots": 2048, "execution": {"rep_delay": 0.00001}})
    job = estimator.run(circuit, observable)

报错原因说明 #

传统backend.run()方法直接接受rep_delay作为参数，但Qiskit Runtime原语（Estimator/Sampler）的参数结构不同——所有与执行相关的配置都需要嵌套在options的execution字段下，直接传递rep_delay会被识别为未定义的关键字参数，从而触发错误。

内容的提问来源于stack exchange，提问作者Robert Cumming