Support realtime typed classical variables in qss

[bharat-thotakura]

What is happening?

Qiskit 1.1 added a feature to add typed classical variables to a qiskit.QuantumCircuit. However, trying to compile a circuit containing such variables using qiskit-superstaq leads to the following error currently:

UnsupportedFeatureForVersion: 'Dumping QPY version 11, but version 12 is required for: circuits containing realtime variables.'

To replicate this, try:

import qiskit
import qiskit_superstaq as qss 
from qiskit.circuit.classical import expr, types
 
qr = qiskit.QuantumRegister(2, "q")
cr = qiskit.ClassicalRegister(2, "c")
qc = qiskit.QuantumCircuit(qr, cr)

a = qc.add_input("a", types.Bool())
with qc.if_test(a) as else_:
    qc.x(0)
with else_:
    qc.h(0)
 
qc.cx(0, 1)
qc.measure(qr, cr)

compiler_output = qss.SuperstaqProvider().get_backend("ibmq_kyoto_qpu").compile(qc)

What are the current alternatives?

Use qiskit's standard transpiler

Environment

qiskit-superstaq version: 0.5.21
qiskit version: 1.1.1
Python version: 3.12.4