[Python] Spooky kernels (kernel calls inside kernels don't honor modules)

[boschmitt]

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Describe the bug

CUDA-Q does not honor module namespace on kernel calls inside kernels.

Steps to reproduce the bug

Take the following directory project structure:

|-- foo/
|   |-- __init__.py
|
|-- main.py

Where foo/__init__.py contains:

import cudaq

@cudaq.kernel
def spooky_kernel():
    cudaq.qubit()

And main.py contains:

import foo
import cudaq

@cudaq.kernel
def test0():
    spooky_kernel()

counts = cudaq.sample(test0)
print(counts)

Running this code python main.py outputs: { 0:1000 }, which is wrong because it is calling spooky_kernel() and not foo.spooky_kernel()

Expected behavior

A NameError since spooky_kernel is not defined.

Is this a regression? If it is, put the last known working version (or commit) here.

Not a regression

Environment

• CUDA Quantum version: proto-0.8.0 (https://github.com/NVIDIA/cuda-quantum a9e2324)
• Python version: 3.12
• Operating system: ubuntu 24.04

Suggestions

No response

[schweitzpgi]

👻