Running a scheduled circuit containing delay gates errors on Qiskit Aer 0.14 if the AerSimulator is initialized from a V1 backend.
Steps to reproduce the problem
from qiskit_ibm_runtime.fake_provider import FakeVigo
from qiskit_aer import AerSimulator
from qiskit import QuantumCircuit, transpile
backend = AerSimulator.from_backend(FakeVigo())
qc = QuantumCircuit(5)
qc.cx(0, 1)
qc.cx(1, 2)
qc.measure_all()
tqc = transpile(qc, backend, scheduling_method="alap")
backend.run([tqc]).result()
Errors with
---------------------------------------------------------------------------
AerError Traceback (most recent call last)
Cell In[1], line 12
9 qc.measure_all()
10 tqc = transpile(qc, backend, scheduling_method="alap")
---> 12 backend.run([tqc]).result()
File ~/mambaforge/envs/qiskit1/lib/python3.11/site-packages/qiskit_aer/jobs/utils.py:42, in requires_submit.<locals>._wrapper(self, *args, **kwargs)
40 if self._future is None:
41 raise JobError("Job not submitted yet!. You have to .submit() first!")
---> 42 return func(self, *args, **kwargs)
File ~/mambaforge/envs/qiskit1/lib/python3.11/site-packages/qiskit_aer/jobs/aerjob.py:114, in AerJob.result(self, timeout)
96 @requires_submit
97 def result(self, timeout=None):
98 # pylint: disable=arguments-differ
99 """Get job result. The behavior is the same as the underlying
100 concurrent Future objects,
101
(...)
112 concurrent.futures.CancelledError: if job cancelled before completed.
113 """
--> 114 return self._future.result(timeout=timeout)
File ~/mambaforge/envs/qiskit1/lib/python3.11/concurrent/futures/_base.py:456, in Future.result(self, timeout)
454 raise CancelledError()
455 elif self._state == FINISHED:
--> 456 return self.__get_result()
457 else:
458 raise TimeoutError()
File ~/mambaforge/envs/qiskit1/lib/python3.11/concurrent/futures/_base.py:401, in Future.__get_result(self)
399 if self._exception:
400 try:
--> 401 raise self._exception
402 finally:
403 # Break a reference cycle with the exception in self._exception
404 self = None
File ~/mambaforge/envs/qiskit1/lib/python3.11/concurrent/futures/thread.py:58, in _WorkItem.run(self)
55 return
57 try:
---> 58 result = self.fn(*self.args, **self.kwargs)
59 except BaseException as exc:
60 self.future.set_exception(exc)
File ~/mambaforge/envs/qiskit1/lib/python3.11/site-packages/qiskit_aer/backends/aerbackend.py:454, in AerBackend._execute_circuits_job(self, circuits, parameter_binds, run_options, job_id, format_result)
451 circuits, noise_model = self._compile(circuits, **run_options)
453 if self._target is not None:
--> 454 aer_circuits, idx_maps = assemble_circuits(circuits, self.configuration().basis_gates)
455 else:
456 aer_circuits, idx_maps = assemble_circuits(circuits)
File ~/mambaforge/envs/qiskit1/lib/python3.11/site-packages/qiskit_aer/backends/aer_compiler.py:959, in assemble_circuits(circuits, basis_gates)
956 if basis_gates is not None:
957 basis_gates_set = set(basis_gates)
958 aer_circuits, idx_maps = zip(
--> 959 *[assemble_circuit(circuit, basis_gates_set) for circuit in circuits]
960 )
961 else:
962 aer_circuits, idx_maps = zip(*[assemble_circuit(circuit) for circuit in circuits])
File ~/mambaforge/envs/qiskit1/lib/python3.11/site-packages/qiskit_aer/backends/aer_compiler.py:959, in <listcomp>(.0)
956 if basis_gates is not None:
957 basis_gates_set = set(basis_gates)
958 aer_circuits, idx_maps = zip(
--> 959 *[assemble_circuit(circuit, basis_gates_set) for circuit in circuits]
960 )
961 else:
962 aer_circuits, idx_maps = zip(*[assemble_circuit(circuit) for circuit in circuits])
File ~/mambaforge/envs/qiskit1/lib/python3.11/site-packages/qiskit_aer/backends/aer_compiler.py:681, in assemble_circuit(circuit, basis_gates)
678 elif hasattr(inst.operation, "condition_expr") and inst.operation.condition_expr:
679 conditional_expr = inst.operation.condition_expr
--> 681 num_of_aer_ops += _assemble_op(
682 circuit,
683 aer_circ,
684 inst,
685 qubit_indices,
686 clbit_indices,
687 is_conditional,
688 conditional_reg,
689 conditional_expr,
690 basis_gates,
691 )
692 index_map.append(num_of_aer_ops - 1)
694 return aer_circ, index_map
File ~/mambaforge/envs/qiskit1/lib/python3.11/site-packages/qiskit_aer/backends/aer_compiler.py:926, in _assemble_op(circ, aer_circ, inst, qubit_indices, clbit_indices, is_conditional, conditional_reg, conditional_expr, basis_gates)
921 raise AerError(
922 "control-flow instructions must be converted " f"to jump and mark instructions: {name}"
923 )
925 else:
--> 926 raise AerError(f"unknown instruction: {name}")
928 return num_of_aer_ops
AerError: 'unknown instruction: delay'
What is the expected behavior?
The above code worked correctly with Aer 0.13.3, it also works correctly for V2 fake backends in Aer 0.14
Suggested solutions
There looks like there is a bug in _assemble_op where it expects "delay" to be in a backends basis gates, but ibm backends don't report delay as a basis gate.
Informations
What is the current behavior?
Running a scheduled circuit containing delay gates errors on Qiskit Aer 0.14 if the AerSimulator is initialized from a V1 backend.
Steps to reproduce the problem
Errors with
What is the expected behavior?
The above code worked correctly with Aer 0.13.3, it also works correctly for V2 fake backends in Aer 0.14
Suggested solutions
There looks like there is a bug in
_assemble_opwhere it expects "delay" to be in a backends basis gates, but ibm backends don't report delay as a basis gate.