如何在Qiskit中制作迭代量子电路？

from qiskit import QuantumCircuit, transpile, assemble, Aer, execute
from qiskit.visualization import plot_bloch_multivector, plot_histogram
from qiskit.extensions import UnitaryGate

qc = QuantumCircuit(num_qubits)

num_iterations = 3
theta = 0.5

def iteration_circuit(qc, theta):
    # 添加量子门操作
    qc.rx(theta, 0)
    qc.rz(theta, 0)
    qc.cx(0, 1)
    qc.cx(1, 0)

for _ in range(num_iterations):
    iteration_circuit(qc, theta)

simulator = Aer.get_backend('statevector_simulator')
job = execute(qc, simulator)
result = job.result()
statevector = result.get_statevector()

# 绘制布洛赫球面和直方图
plot_bloch_multivector(statevector)
plot_histogram(result.get_counts())