Circuit decoding error #11446
Description
Environment
- Qiskit Terra version:
0.45.1 - Python version:
3.10.12 - Operating system: macOS
13.6 (22G120)
What is happening?
Serialization decoding of a circuit with qpy fails when qargs for a delay are passed in as a set and len(qargs) > 1. The error raised here is
ValueError: b'\x00' is not a valid Value
and when running the circuit on a device, the job will fail with something like:
Failed - UnicodeDecodeError: 'utf-8' codec can't decode byte 0xa0 in position 87: invalid start byte
How can we reproduce the issue?
from qiskit import QuantumCircuit, qpy
# This case fails when the delay is present
num_qubits = 2
qubits = {0, 1}
# This case always runs
#num_qubits = 1
#qubits = {0}
qc = QuantumCircuit(num_qubits)
qc.delay(duration=160, qarg=qubits)
qc.x(qubits)
with open("test.qpy", "wb") as f:
qpy.dump(qc, f)
with open("test.qpy", "rb") as f:
qpy.load(f)
What should happen?
This should run regardless of the cases described.
Any suggestions?
No response