instruction param position out of range when truncation is processed

[hhorii]

Informations

• Qiskit Aer version: 0.34.1
• Python version: any
• Operating system: 0.10.2

What is the current behavior?

The current parameterized qobj is not processed correctly when truncation is enabled.

Once truncation is processed, indices of parameters must be changed to skip truncated instructions.
However, the current implementation uses specified indices and then throw exception Invalid parameterized qobj: instruction param position out of range.

Steps to reproduce the problem

import numpy as np
from qiskit import transpile, QuantumCircuit
from qiskit.providers.aer import AerSimulator
from qiskit.circuit.library import RealAmplitudes

simulator = AerSimulator()

circuit = QuantumCircuit(10, 10)
circuit = circuit.compose(RealAmplitudes(10), range(10))
circuit = transpile(circuit, simulator)
for q in range(5):
    circuit.measure(q, q)

num_of_params = 10
param_map = {}
for param in circuit.parameters:
    param_values = [ np.random.random() for _ in range(num_of_params) ]
    param_map[param] = param_values

simulator.run(circuit, parameter_binds=[param_map]).result().success

What is the expected behavior?

No runtime exception when the above script runs.

Suggested solutions

Resolve parameters after truncation or resolve parameters with consideration of truncation results.