generating preset pass manager for simulators fails

[kevinsung]

Environment

• Qiskit Terra version: 0.21.1
• Python version: 3.9.13
• Operating system: Arch Linux

What is happening?

generating preset pass manager for ibmq_qasm_simulator fails

How can we reproduce the issue?

from qiskit import IBMQ
from qiskit.transpiler.preset_passmanagers import generate_preset_pass_manager

IBMQ.load_account()
provider = IBMQ.get_provider(hub='ibm-q-internal', group='deployed', project='default')
backend = provider.get_backend("ibmq_qasm_simulator")
pass_manager = generate_preset_pass_manager(optimization_level=0, backend=backend)

---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
Input In [2], in <cell line: 7>()
      5 provider = IBMQ.get_provider(hub='ibm-q-internal', group='deployed', project='default')
      6 backend = provider.get_backend("ibmq_qasm_simulator")
----> 7 pass_manager = generate_preset_pass_manager(optimization_level=0, backend=backend)

File /usr/local/venvs/low-rank-qdrift-278at_FA/lib/python3.9/site-packages/qiskit/transpiler/preset_passmanagers/__init__.py:178, in generate_preset_pass_manager(optimization_level, backend, target, basis_gates, inst_map, coupling_map, instruction_durations, backend_properties, timing_constraints, initial_layout, layout_method, routing_method, translation_method, scheduling_method, approximation_degree, seed_transpiler, unitary_synthesis_method, unitary_synthesis_plugin_config)
    158 pm_options = dict(
    159     target=target,
    160     basis_gates=basis_gates,
   (...)
    174     initial_layout=initial_layout,
    175 )
    177 if backend is not None:
--> 178     pm_config = PassManagerConfig.from_backend(backend, **pm_options)
    179 else:
    180     pm_config = PassManagerConfig(**pm_options)

File /usr/local/venvs/low-rank-qdrift-278at_FA/lib/python3.9/site-packages/qiskit/transpiler/passmanager_config.py:123, in PassManagerConfig.from_backend(cls, backend, **pass_manager_options)
    121 if backend_version < 2:
    122     if hasattr(backend, "defaults"):
--> 123         res.inst_map = backend.defaults().instruction_schedule_map
    124 else:
    125     res.inst_map = backend.instruction_schedule_map

AttributeError: 'NoneType' object has no attribute 'instruction_schedule_map'

What should happen?

It shouldn't throw an error.

Any suggestions?

No response

[kevinsung]

Same issue with AerSimulator backend. I think that the code should be able to handle being passed a simulator. Of course optimization is not as important with a simulator, but just having it be handled would be a nice convenience.

[kevinsung]

With BasicAer you still get an error, but it's different.

from qiskit import BasicAer
from qiskit.transpiler.preset_passmanagers import generate_preset_pass_manager

backend = BasicAer.get_backend("statevector_simulator")
pass_manager = generate_preset_pass_manager(optimization_level=0, backend=backend)

---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
Input In [2], in <cell line: 5>()
      2 from qiskit.transpiler.preset_passmanagers import generate_preset_pass_manager
      4 backend = BasicAer.get_backend("statevector_simulator")
----> 5 pass_manager = generate_preset_pass_manager(optimization_level=0, backend=backend)

File ~/projects/qiskit-terra/qiskit/transpiler/preset_passmanagers/__init__.py:178, in generate_preset_pass_manager(optimization_level, backend, target, basis_gates, inst_map, coupling_map, instruction_durations, backend_properties, timing_constraints, initial_layout, layout_method, routing_method, translation_method, scheduling_method, approximation_degree, seed_transpiler, unitary_synthesis_method, unitary_synthesis_plugin_config)
    158 pm_options = dict(
    159     target=target,
    160     basis_gates=basis_gates,
   (...)
    174     initial_layout=initial_layout,
    175 )
    177 if backend is not None:
--> 178     pm_config = PassManagerConfig.from_backend(backend, **pm_options)
    179 else:
    180     pm_config = PassManagerConfig(**pm_options)

File ~/projects/qiskit-terra/qiskit/transpiler/passmanager_config.py:133, in PassManagerConfig.from_backend(cls, backend, **pass_manager_options)
    131 if res.instruction_durations is None:
    132     if backend_version < 2:
--> 133         res.instruction_durations = InstructionDurations.from_backend(backend)
    134     else:
    135         res.instruction_durations = backend.instruction_durations

File ~/projects/qiskit-terra/qiskit/transpiler/instruction_durations.py:77, in InstructionDurations.from_backend(cls, backend)
     75 # All durations in seconds in gate_length
     76 instruction_durations = []
---> 77 for gate, insts in backend.properties()._gates.items():
     78     for qubits, props in insts.items():
     79         if "gate_length" in props:

AttributeError: 'NoneType' object has no attribute '_gates'