Circuit with parametrized delay gate doesn't execute on backend

[przemekk125]

Environment

• Qiskit version: 1.1.2
• Python version: 3.10.7
• Operating system: Windows 11

What is happening?

A simple circuit with 1 delay gate on single qbit on ibm_brisbane backend when executed gives Internal error 1500. Similar issue poped up (#11010), but this solution doesn't work.

How can we reproduce the issue?

from qiskit.quantum_info import Pauli
import numpy as np
from qiskit import QuantumCircuit
from qiskit.circuit import Parameter
from qiskit_ibm_runtime import EstimatorV2 as Estimator
from qiskit_ibm_runtime import QiskitRuntimeService
from qiskit.transpiler.preset_passmanagers import generate_preset_pass_manager

backend_name = "ibm_brisbane"

qbit_num = 28

t_vals = np.linspace(0,100,20)
t = Parameter("time")

observables = Pauli("X")


circuit = QuantumCircuit(1)
circuit.delay(t,0,unit="us")


backend = QiskitRuntimeService().backend(name=backend_name)
pass_manager = generate_preset_pass_manager(1,backend=backend,initial_layout=[qbit_num])
pass_manager.scheduling = None

echo_transpiled = pass_manager.run(circuits=circuit)
observables_transpiled = observables.apply_layout(echo_transpiled.layout)
pub = (echo_transpiled,observables_transpiled,t_vals)


estimator = Estimator(mode=backend)

job = estimator.run([pub])

What should happen?

Circuit should be executed on ibm_brisbane backend

Any suggestions?

No response

[przemekk125]

It appears that what was causing error was fact that all backends need delay time given is multipules of 8 in dt unit.