InstructionDurations.from_backend(...) does not support BackendV2

[1ucian0]

Environment

• Qiskit version: 1.2.0.dev0+8f6714d
• Python version: 3.8.19
• Operating system: MacOs

What is happening?

While migrating test/python/transpiler/test_instruction_durations.py to BackendV2 (see #12660 for context), I realized that InstructionDurations.from_backend does not support BackendV2 instances.

How can we reproduce the issue?

from qiskit.providers.fake_provider import GenericBackendV2
from qiskit.transpiler import InstructionDurations

backend = GenericBackendV2(num_qubits=2, calibrate_instructions=True, seed=42)
InstructionDurations.from_backend(backend)

AttributeError: 'GenericBackendV2' object has no attribute 'properties'

What should happen?

Either this method (preferred option) or a potential InstructionDurations.from_backendV2 should support creating an InstructionDurations from a BackendV2, the current preferred way.

Any suggestions?

No response

[shravanpatel30]

Hi @1ucian0, I was looking into this issue and had a question. I looked at the BackendV1 fake backends and they are using old IBM device data for the properties and so I was wondering what date and time should be used to create the properties dictionary for GenericBackendV2?

[1ucian0]

I looked at the BackendV1 fake backends and they are using old IBM device data for the properties and so I was wondering what date and time should be used to create the properties dictionary for GenericBackendV2?

Thanks for explaining this in #12901 . The PR to understand this question. The point is to construct InstructionDuration from a BackendV2 without extending BackendV2. This might not be an easy issue.

[Cryoris]

You should be able to just do

instruction_durations = backend.target.durations()   # where backend is a BackendV2