Cannot import CUDAQ on an HPC

terry.tqchen · June 24, 2025, 12:48pm

Hi all,

I’m very new to CUDA-Q. I tried to install CUDA-Q on our school’s HPC. Everything looks fine without any error or warning, but when I try to validate my installation, I cannot even import CUDA-Q and I got a “Segmentation Fault (core dumped)”. Below is what I do. The GPU is H100.

qsub -I -l select=1:mem=5GB:ncpus=1:ngpus=1 -q -P
module load cuda/12.2
module load miniforge/24.3
conda create -n cudaq python=3.10 -y
conda activate cudaq
pip install cudaq

Below is the information for nvcc:

nvcc: NVIDIA (R) Cuda compiler driver

Copyright (c) 2005-2023 NVIDIA Corporation

Built on Tue_Aug_15_22:02:13_PDT_2023

Cuda compilation tools, release 12.2, V12.2.140

Build cuda_12.2.r12.2/compiler.33191640_0

and here is the information for nvidia-smi:

Tue Jun 24 20:13:58 2025
+-----------------------------------------------------------------------------------------+
| NVIDIA-SMI 550.144.03             Driver Version: 550.144.03     CUDA Version: 12.4     |
|-----------------------------------------+------------------------+----------------------+
| GPU  Name                 Persistence-M | Bus-Id          Disp.A | Volatile Uncorr. ECC |
| Fan  Temp   Perf          Pwr:Usage/Cap |           Memory-Usage | GPU-Util  Compute M. |
|                                         |                        |               MIG M. |
|=========================================+========================+======================|
|   0  NVIDIA H100 80GB HBM3          On  |   00000000:9D:00.0 Off |                    0 |
| N/A   29C    P0             70W /  700W |       1MiB /  81559MiB |      0%      Default |
|                                         |                        |             Disabled |
+-----------------------------------------+------------------------+----------------------+

+-----------------------------------------------------------------------------------------+
| Processes:                                                                              |
|  GPU   GI   CI        PID   Type   Process name                              GPU Memory |
|        ID   ID                                                               Usage      |
|=========================================================================================|
|  No running processes found                                                             |
+-----------------------------------------------------------------------------------------+

and this is what I have from python:

Python 3.10.18 | packaged by conda-forge | (main, Jun  4 2025, 14:45:41) [GCC 13.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import cudaq
Segmentation fault (core dumped)

Any idea on what happend? Thank you!

mawolf · June 26, 2025, 2:26pm

Hi @terry.tqchen, Thank you for exploring CUDA-Q. Can you try adding the code below to your Python script? This should provide some additional information that might help us find a solution.

import os

os.environ['CUDAQ_LOG_LEVEL']='info'

import cudaq

m.etienne.lord · July 29, 2025, 2:18pm

Good morning,

I got the same error on a fresh install:

Python 3.10.18 | packaged by conda-forge | (main, Jun  4 2025, 14:45:41) [GCC 13.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import os
>>> 
>>> os.environ['CUDAQ_LOG_LEVEL']='info'
>>> 
>>> import cudaq
[2025-07-29 10:12:34.371] [info] [LinkedLibraryHolder.cpp:205] Init infrastructure for pythonic builder.
[2025-07-29 10:12:34.371] [info] [LinkedLibraryHolder.cpp:185] Found Target anyon with config file anyon.yml
[2025-07-29 10:12:34.371] [info] [LinkedLibraryHolder.cpp:195] Found Target: anyon -> (sim=qpp, platform=default)
[2025-07-29 10:12:34.371] [info] [LinkedLibraryHolder.cpp:185] Found Target braket with config file braket.yml
[2025-07-29 10:12:34.371] [info] [LinkedLibraryHolder.cpp:195] Found Target: braket -> (sim=qpp, platform=default)
[2025-07-29 10:12:34.371] [info] [LinkedLibraryHolder.cpp:185] Found Target density-matrix-cpu with config file density-matrix-cpu.yml
[2025-07-29 10:12:34.371] [info] [LinkedLibraryHolder.cpp:129] CUDA-Q Library Path is /home/etienne/miniconda3/envs/cudaq/lib/python3.10/site-packages/cudaq/mlir/_mlir_libs/../../../lib.
[2025-07-29 10:12:34.372] [info] [LinkedLibraryHolder.cpp:135] Use dm simulator for target density-matrix-cpu
[2025-07-29 10:12:34.372] [info] [LinkedLibraryHolder.cpp:195] Found Target: density-matrix-cpu -> (sim=dm, platform=default)
[2025-07-29 10:12:34.372] [info] [LinkedLibraryHolder.cpp:185] Found Target dynamics with config file dynamics.yml
[2025-07-29 10:12:34.372] [info] [LinkedLibraryHolder.cpp:129] CUDA-Q Library Path is /home/etienne/miniconda3/envs/cudaq/lib/python3.10/site-packages/cudaq/mlir/_mlir_libs/../../../lib.
[2025-07-29 10:12:34.372] [info] [LinkedLibraryHolder.cpp:135] Use dynamics simulator for target dynamics
[2025-07-29 10:12:34.372] [info] [LinkedLibraryHolder.cpp:195] Found Target: dynamics -> (sim=dynamics, platform=mqpu)
[2025-07-29 10:12:34.372] [info] [LinkedLibraryHolder.cpp:185] Found Target fermioniq with config file fermioniq.yml
[2025-07-29 10:12:34.372] [info] [LinkedLibraryHolder.cpp:195] Found Target: fermioniq -> (sim=qpp, platform=default)
[2025-07-29 10:12:34.372] [info] [LinkedLibraryHolder.cpp:185] Found Target infleqtion with config file infleqtion.yml
[2025-07-29 10:12:34.372] [info] [LinkedLibraryHolder.cpp:195] Found Target: infleqtion -> (sim=qpp, platform=default)
[2025-07-29 10:12:34.372] [info] [LinkedLibraryHolder.cpp:185] Found Target ionq with config file ionq.yml
[2025-07-29 10:12:34.372] [info] [LinkedLibraryHolder.cpp:195] Found Target: ionq -> (sim=qpp, platform=default)
[2025-07-29 10:12:34.372] [info] [LinkedLibraryHolder.cpp:185] Found Target iqm with config file iqm.yml
[2025-07-29 10:12:34.372] [info] [LinkedLibraryHolder.cpp:195] Found Target: iqm -> (sim=qpp, platform=default)
[2025-07-29 10:12:34.372] [info] [LinkedLibraryHolder.cpp:185] Found Target nvidia-fp64 with config file nvidia-fp64.yml
[2025-07-29 10:12:34.372] [info] [LinkedLibraryHolder.cpp:129] CUDA-Q Library Path is /home/etienne/miniconda3/envs/cudaq/lib/python3.10/site-packages/cudaq/mlir/_mlir_libs/../../../lib.
[2025-07-29 10:12:34.372] [info] [LinkedLibraryHolder.cpp:135] Use cusvsim-fp64 simulator for target nvidia-fp64
[2025-07-29 10:12:34.372] [info] [LinkedLibraryHolder.cpp:195] Found Target: nvidia-fp64 -> (sim=cusvsim_fp64, platform=default)
[2025-07-29 10:12:34.372] [info] [LinkedLibraryHolder.cpp:185] Found Target nvidia-mgpu with config file nvidia-mgpu.yml
[2025-07-29 10:12:34.372] [info] [LinkedLibraryHolder.cpp:129] CUDA-Q Library Path is /home/etienne/miniconda3/envs/cudaq/lib/python3.10/site-packages/cudaq/mlir/_mlir_libs/../../../lib.
[2025-07-29 10:12:34.372] [info] [LinkedLibraryHolder.cpp:135] Use nvidia-mgpu simulator for target nvidia-mgpu
[2025-07-29 10:12:34.372] [info] [LinkedLibraryHolder.cpp:195] Found Target: nvidia-mgpu -> (sim=nvidia_mgpu, platform=default)
[2025-07-29 10:12:34.372] [info] [LinkedLibraryHolder.cpp:185] Found Target nvidia-mqpu-fp64 with config file nvidia-mqpu-fp64.yml
[2025-07-29 10:12:34.372] [info] [LinkedLibraryHolder.cpp:129] CUDA-Q Library Path is /home/etienne/miniconda3/envs/cudaq/lib/python3.10/site-packages/cudaq/mlir/_mlir_libs/../../../lib.
[2025-07-29 10:12:34.372] [info] [LinkedLibraryHolder.cpp:135] Use cusvsim-fp64 simulator for target nvidia-mqpu-fp64
[2025-07-29 10:12:34.372] [info] [LinkedLibraryHolder.cpp:195] Found Target: nvidia-mqpu-fp64 -> (sim=cusvsim_fp64, platform=mqpu)
[2025-07-29 10:12:34.372] [info] [LinkedLibraryHolder.cpp:185] Found Target nvidia-mqpu-mps with config file nvidia-mqpu-mps.yml
[2025-07-29 10:12:34.372] [info] [LinkedLibraryHolder.cpp:129] CUDA-Q Library Path is /home/etienne/miniconda3/envs/cudaq/lib/python3.10/site-packages/cudaq/mlir/_mlir_libs/../../../lib.
[2025-07-29 10:12:34.372] [info] [LinkedLibraryHolder.cpp:135] Use tensornet-mps simulator for target nvidia-mqpu-mps
[2025-07-29 10:12:34.372] [info] [LinkedLibraryHolder.cpp:195] Found Target: nvidia-mqpu-mps -> (sim=tensornet_mps, platform=mqpu)
[2025-07-29 10:12:34.373] [info] [LinkedLibraryHolder.cpp:185] Found Target nvidia-mqpu with config file nvidia-mqpu.yml
[2025-07-29 10:12:34.373] [info] [LinkedLibraryHolder.cpp:129] CUDA-Q Library Path is /home/etienne/miniconda3/envs/cudaq/lib/python3.10/site-packages/cudaq/mlir/_mlir_libs/../../../lib.
[2025-07-29 10:12:34.373] [info] [LinkedLibraryHolder.cpp:135] Use cusvsim-fp32 simulator for target nvidia-mqpu
[2025-07-29 10:12:34.373] [info] [LinkedLibraryHolder.cpp:195] Found Target: nvidia-mqpu -> (sim=cusvsim_fp32, platform=mqpu)
[2025-07-29 10:12:34.373] [info] [LinkedLibraryHolder.cpp:185] Found Target nvidia with config file nvidia.yml
[2025-07-29 10:12:34.373] [info] [LinkedLibraryHolder.cpp:129] CUDA-Q Library Path is /home/etienne/miniconda3/envs/cudaq/lib/python3.10/site-packages/cudaq/mlir/_mlir_libs/../../../lib.
[2025-07-29 10:12:34.373] [info] [LinkedLibraryHolder.cpp:135] Use cusvsim-fp32 simulator for target nvidia
[2025-07-29 10:12:34.373] [info] [LinkedLibraryHolder.cpp:195] Found Target: nvidia -> (sim=cusvsim_fp32, platform=default)
[2025-07-29 10:12:34.373] [info] [LinkedLibraryHolder.cpp:185] Found Target nvqc with config file nvqc.yml
[2025-07-29 10:12:34.373] [info] [LinkedLibraryHolder.cpp:195] Found Target: nvqc -> (sim=qpp, platform=mqpu)
[2025-07-29 10:12:34.373] [info] [LinkedLibraryHolder.cpp:185] Found Target opt-test with config file opt-test.yml
[2025-07-29 10:12:34.373] [info] [LinkedLibraryHolder.cpp:129] CUDA-Q Library Path is /home/etienne/miniconda3/envs/cudaq/lib/python3.10/site-packages/cudaq/mlir/_mlir_libs/../../../lib.
[2025-07-29 10:12:34.373] [info] [LinkedLibraryHolder.cpp:135] Use cusvsim-fp32 simulator for target opt-test
[2025-07-29 10:12:34.373] [info] [LinkedLibraryHolder.cpp:195] Found Target: opt-test -> (sim=cusvsim_fp32, platform=default)
[2025-07-29 10:12:34.373] [info] [LinkedLibraryHolder.cpp:185] Found Target oqc with config file oqc.yml
[2025-07-29 10:12:34.373] [info] [LinkedLibraryHolder.cpp:195] Found Target: oqc -> (sim=qpp, platform=default)
[2025-07-29 10:12:34.373] [info] [LinkedLibraryHolder.cpp:185] Found Target orca-photonics with config file orca-photonics.yml
[2025-07-29 10:12:34.373] [info] [LinkedLibraryHolder.cpp:195] Found Target: orca-photonics -> (sim=qpp, platform=default)
[2025-07-29 10:12:34.373] [info] [LinkedLibraryHolder.cpp:185] Found Target orca with config file orca.yml
[2025-07-29 10:12:34.373] [info] [LinkedLibraryHolder.cpp:195] Found Target: orca -> (sim=qpp, platform=mqpu)
[2025-07-29 10:12:34.373] [info] [LinkedLibraryHolder.cpp:185] Found Target pasqal with config file pasqal.yml
[2025-07-29 10:12:34.374] [info] [LinkedLibraryHolder.cpp:195] Found Target: pasqal -> (sim=qpp, platform=default)
[2025-07-29 10:12:34.374] [info] [LinkedLibraryHolder.cpp:185] Found Target qpp-cpu with config file qpp-cpu.yml
[2025-07-29 10:12:34.374] [info] [LinkedLibraryHolder.cpp:129] CUDA-Q Library Path is /home/etienne/miniconda3/envs/cudaq/lib/python3.10/site-packages/cudaq/mlir/_mlir_libs/../../../lib.
[2025-07-29 10:12:34.374] [info] [LinkedLibraryHolder.cpp:135] Use qpp simulator for target qpp-cpu
[2025-07-29 10:12:34.374] [info] [LinkedLibraryHolder.cpp:195] Found Target: qpp-cpu -> (sim=qpp, platform=default)
[2025-07-29 10:12:34.374] [info] [LinkedLibraryHolder.cpp:185] Found Target quantinuum with config file quantinuum.yml
[2025-07-29 10:12:34.374] [info] [LinkedLibraryHolder.cpp:195] Found Target: quantinuum -> (sim=qpp, platform=default)
[2025-07-29 10:12:34.374] [info] [LinkedLibraryHolder.cpp:185] Found Target quera with config file quera.yml
[2025-07-29 10:12:34.374] [info] [LinkedLibraryHolder.cpp:195] Found Target: quera -> (sim=qpp, platform=default)
[2025-07-29 10:12:34.374] [info] [LinkedLibraryHolder.cpp:185] Found Target remote-mqpu with config file remote-mqpu.yml
[2025-07-29 10:12:34.374] [info] [LinkedLibraryHolder.cpp:195] Found Target: remote-mqpu -> (sim=qpp, platform=mqpu)
[2025-07-29 10:12:34.374] [info] [LinkedLibraryHolder.cpp:185] Found Target stim with config file stim.yml
[2025-07-29 10:12:34.374] [info] [LinkedLibraryHolder.cpp:129] CUDA-Q Library Path is /home/etienne/miniconda3/envs/cudaq/lib/python3.10/site-packages/cudaq/mlir/_mlir_libs/../../../lib.
[2025-07-29 10:12:34.374] [info] [LinkedLibraryHolder.cpp:135] Use stim simulator for target stim
[2025-07-29 10:12:34.374] [info] [LinkedLibraryHolder.cpp:195] Found Target: stim -> (sim=stim, platform=default)
[2025-07-29 10:12:34.374] [info] [LinkedLibraryHolder.cpp:185] Found Target tensornet-mps with config file tensornet-mps.yml
[2025-07-29 10:12:34.374] [info] [LinkedLibraryHolder.cpp:129] CUDA-Q Library Path is /home/etienne/miniconda3/envs/cudaq/lib/python3.10/site-packages/cudaq/mlir/_mlir_libs/../../../lib.
[2025-07-29 10:12:34.374] [info] [LinkedLibraryHolder.cpp:135] Use tensornet-mps simulator for target tensornet-mps
[2025-07-29 10:12:34.374] [info] [LinkedLibraryHolder.cpp:195] Found Target: tensornet-mps -> (sim=tensornet_mps, platform=default)
[2025-07-29 10:12:34.374] [info] [LinkedLibraryHolder.cpp:185] Found Target tensornet with config file tensornet.yml
[2025-07-29 10:12:34.374] [info] [LinkedLibraryHolder.cpp:129] CUDA-Q Library Path is /home/etienne/miniconda3/envs/cudaq/lib/python3.10/site-packages/cudaq/mlir/_mlir_libs/../../../lib.
[2025-07-29 10:12:34.374] [info] [LinkedLibraryHolder.cpp:135] Use tensornet simulator for target tensornet
[2025-07-29 10:12:34.374] [info] [LinkedLibraryHolder.cpp:195] Found Target: tensornet -> (sim=tensornet, platform=default)
[2025-07-29 10:12:34.374] [info] [LinkedLibraryHolder.cpp:230] Init: Library Path is /home/etienne/miniconda3/envs/cudaq/lib/python3.10/site-packages/cudaq/mlir/_mlir_libs/../../../lib.
[2025-07-29 10:12:34.374] [info] [LinkedLibraryHolder.cpp:242] Init: add dynamic library path /home/etienne/miniconda3/envs/cudaq/lib/python3.10/site-packages/cuquantum/lib/libcustatevec.so.1.
[2025-07-29 10:12:34.374] [info] [LinkedLibraryHolder.cpp:242] Init: add dynamic library path /home/etienne/miniconda3/envs/cudaq/lib/python3.10/site-packages/cuquantum/lib/libcutensornet.so.2.
[2025-07-29 10:12:34.374] [info] [LinkedLibraryHolder.cpp:242] Init: add dynamic library path /home/etienne/miniconda3/envs/cudaq/lib/python3.10/site-packages/cutensor/lib/libcutensor.so.2.
[2025-07-29 10:12:34.374] [info] [LinkedLibraryHolder.cpp:242] Init: add dynamic library path /home/etienne/miniconda3/envs/cudaq/lib/python3.10/site-packages/nvidia/cuda_runtime/lib/libcudart.so.11.
[2025-07-29 10:12:34.374] [info] [LinkedLibraryHolder.cpp:242] Init: add dynamic library path /home/etienne/miniconda3/envs/cudaq/lib/python3.10/site-packages/nvidia/curand/lib/libcurand.so.10.
[2025-07-29 10:12:34.374] [info] [LinkedLibraryHolder.cpp:242] Init: add dynamic library path /home/etienne/miniconda3/envs/cudaq/lib/python3.10/site-packages/nvidia/cuda_nvrtc/lib/libnvrtc.so.11.
[2025-07-29 10:12:34.450] [info] [LinkedLibraryHolder.cpp:322] Found platform plugin default.
[2025-07-29 10:12:34.451] [info] [LinkedLibraryHolder.cpp:322] Found platform plugin mqpu.
[2025-07-29 10:12:34.452] [info] [LinkedLibraryHolder.cpp:301] Found simulator plugin custatevec_fp32.
[2025-07-29 10:12:34.453] [info] [LinkedLibraryHolder.cpp:301] Found simulator plugin custatevec_fp64.
[2025-07-29 10:12:34.453] [info] [LinkedLibraryHolder.cpp:301] Found simulator plugin custatevec_kernels.
[2025-07-29 10:12:34.455] [info] [LinkedLibraryHolder.cpp:301] Found simulator plugin cusvsim_fp32.
[2025-07-29 10:12:34.456] [info] [LinkedLibraryHolder.cpp:301] Found simulator plugin cusvsim_fp64.
[2025-07-29 10:12:34.458] [info] [LinkedLibraryHolder.cpp:301] Found simulator plugin dm.
[2025-07-29 10:12:34.459] [info] [LinkedLibraryHolder.cpp:301] Found simulator plugin dynamics.
[2025-07-29 10:12:34.461] [info] [LinkedLibraryHolder.cpp:301] Found simulator plugin nvidia_mgpu_fp32.
[2025-07-29 10:12:34.462] [info] [LinkedLibraryHolder.cpp:301] Found simulator plugin nvidia_mgpu.
[2025-07-29 10:12:34.463] [info] [LinkedLibraryHolder.cpp:301] Found simulator plugin qpp.
[2025-07-29 10:12:34.464] [info] [LinkedLibraryHolder.cpp:301] Found simulator plugin stim.
[2025-07-29 10:12:34.465] [info] [LinkedLibraryHolder.cpp:301] Found simulator plugin tensornet_fp32.
[2025-07-29 10:12:34.467] [info] [LinkedLibraryHolder.cpp:301] Found simulator plugin tensornet_mps_fp32.
[2025-07-29 10:12:34.468] [info] [LinkedLibraryHolder.cpp:301] Found simulator plugin tensornet_mps.
[2025-07-29 10:12:34.469] [info] [LinkedLibraryHolder.cpp:301] Found simulator plugin tensornet.
[2025-07-29 10:12:34.759] [info] [LinkedLibraryHolder.cpp:129] CUDA-Q Library Path is /home/etienne/miniconda3/envs/cudaq/lib/python3.10/site-packages/cudaq/mlir/_mlir_libs/../../../lib.
[2025-07-29 10:12:34.759] [info] [LinkedLibraryHolder.cpp:135] Use cusvsim-fp32 simulator for target nvidia
[2025-07-29 10:12:34.759] [info] [LinkedLibraryHolder.cpp:455] Setting target=nvidia (sim=cusvsim_fp32, platform=default)
[2025-07-29 10:12:34.759] [info] [PluginUtils.h:24] Requesting N5nvqir16CircuitSimulatorE plugin via symbol name getCircuitSimulator_cusvsim_fp32.
[2025-07-29 10:12:34.759] [info] [PluginUtils.h:36] Successfully loaded the plugin.
[2025-07-29 10:12:34.842] [info] [NVQIR.cpp:70] [runtime] Setting the circuit simulator to cusvsim-fp32.
[2025-07-29 10:12:34.842] [info] [PluginUtils.h:24] Requesting N5cudaq16quantum_platformE plugin via symbol name getQuantumPlatform_default.
[2025-07-29 10:12:34.842] [info] [PluginUtils.h:36] Successfully loaded the plugin.
[2025-07-29 10:12:34.842] [info] [DefaultQuantumPlatform.cpp:88] Backend string is nvidia
[2025-07-29 10:12:34.843] [info] [DefaultQuantumPlatform.cpp:105] Config file path = /home/etienne/miniconda3/envs/cudaq/lib/python3.10/site-packages/cudaq/mlir/_mlir_libs/../../../targets/nvidia.yml
[2025-07-29 10:12:34.843] [info] [quantum_platform.cpp:37] external caller setting the platform.
[2025-07-29 10:12:34.843] [info] [execution_manager.cpp:21] external caller clearing the execution manager.
Segmentation fault (core dumped)

NVIDIA-SMI

Tue Jul 29 10:17:03 2025       
+---------------------------------------------------------------------------------------+
| NVIDIA-SMI 535.183.01             Driver Version: 535.183.01   CUDA Version: 12.2     |
|-----------------------------------------+----------------------+----------------------+
| GPU  Name                 Persistence-M | Bus-Id        Disp.A | Volatile Uncorr. ECC |
| Fan  Temp   Perf          Pwr:Usage/Cap |         Memory-Usage | GPU-Util  Compute M. |
|                                         |                      |               MIG M. |
|=========================================+======================+======================|
|   0  Quadro RTX 8000                Off | 00000000:17:00.0  On |                  Off |
| 33%   33C    P8              30W / 260W |    507MiB / 49152MiB |     20%      Default |
|                                         |                      |                  N/A |
+-----------------------------------------+----------------------+----------------------+
|   1  Quadro RTX 8000                Off | 00000000:D5:00.0 Off |                  Off |
| 33%   28C    P8              12W / 260W |      6MiB / 49152MiB |      0%      Default |
|                                         |                      |                  N/A |
+-----------------------------------------+----------------------+----------------------+
                                                                                         
+---------------------------------------------------------------------------------------+
| Processes:                                                                            |
|  GPU   GI   CI        PID   Type   Process name                            GPU Memory |
|        ID   ID                                                             Usage      |
|=======================================================================================|
|    0   N/A  N/A      4711      G   /usr/lib/xorg/Xorg                          212MiB |
|    0   N/A  N/A      4885      G   /usr/bin/gnome-shell                         51MiB |
|    0   N/A  N/A      6423      G   ...irefox/6565/usr/lib/firefox/firefox      238MiB |
|    0   N/A  N/A   1810525      G   gnome-control-center                          3MiB |
|    1   N/A  N/A      4711      G   /usr/lib/xorg/Xorg                            4MiB |
+---------------------------------------------------------------------------------------+

Any suggestions?

I got no errors during the installation in a new conda environment using:

pip install cudaq

Thanks!

mawolf · July 30, 2025, 2:39pm

Hi @m.etienne.lord. Thank you for reaching out. One suggested workaround is to try import cuquantum before import cudaq. Does that work for you?

m.etienne.lord · July 30, 2025, 3:05pm

Good morning,

Indeed, importing cuquantum such as:

import cuquantum
import cudaq

solved the problem.

I wasn’t aware this order was important in the import statements.

Thanks!

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Cannot import CUDAQ on an HPC

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