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Not building with cuQuantum SDK (and cirq)

area/gpuInvolves CUDA, GPUs, and similarInvolves CUDA, GPUs, and similar

priority/p1High priorityHigh priority

Status: Open.

Bug

#481 In quantumlib/qsim;

· rugantio opened on Nov 19, 2021

<code>cirq.Circuit(cirq.I(cirq.LineQubit(0)))</code> segfaults when trying to execute on qsim

area/healthInvolves general matters of project configuration, health, maintenance, and similar concernsInvolves general matters of project configuration, health, maintenance, and similar concerns

area/qsimcirqInvolves the qsim-Cirq integration layerInvolves the qsim-Cirq integration layer

priority/p1High priorityHigh priority

Status: Open.

Bug

#540 In quantumlib/qsim;

· vtomole opened on Jul 8, 2022

cuStateVec issue on GPU in Google Colab

area/gpuInvolves CUDA, GPUs, and similarInvolves CUDA, GPUs, and similar

priority/p1High priorityHigh priority

Status: Open.

Bug

#542 In quantumlib/qsim;

· 95-martin-orion opened on Jul 11, 2022

cirq.ClassicallyControlledOperation raises "ValueError: Encountered unparseable op"

area/qsimcirqInvolves the qsim-Cirq integration layerInvolves the qsim-Cirq integration layer

contributors welcomeHelp with this would be appreciatedHelp with this would be appreciated

priority/p1High priorityHigh priority

Status: Open.

Bug

#571 In quantumlib/qsim;

· rht opened on Dec 16, 2022

Question about multi-GPU support

area/gpuInvolves CUDA, GPUs, and similarInvolves CUDA, GPUs, and similar

priority/p1High priorityHigh priority

Status: Open.

Question

#635 In quantumlib/qsim;

· jakurzak opened on Nov 7, 2023

Investigate why some Python expectation value tests failed with NumPy 2

area/devopsInvolves build systems, Make files, Bazel files, continuous integration, and/or other DevOps topicsInvolves build systems, Make files, Bazel files, continuous integration, and/or other DevOps topics

area/healthInvolves general matters of project configuration, health, maintenance, and similar concernsInvolves general matters of project configuration, health, maintenance, and similar concerns

contributors welcomeHelp with this would be appreciatedHelp with this would be appreciated

good first issueGood for newcomersGood for newcomers

priority/p1High priorityHigh priority

Status: Open.

Bug

#754 In quantumlib/qsim;

· mhucka opened on Jun 10, 2025

Remove qsimh

area/docsInvolves documentation, notebooks, README files, and similarInvolves documentation, notebooks, README files, and similar

area/healthInvolves general matters of project configuration, health, maintenance, and similar concernsInvolves general matters of project configuration, health, maintenance, and similar concerns

priority/p1High priorityHigh priority

Status: Open.

Task

#772 In quantumlib/qsim;

· mhucka opened on Jun 16, 2025

.bazelrc lacks configurations for avx512

area/devopsInvolves build systems, Make files, Bazel files, continuous integration, and/or other DevOps topicsInvolves build systems, Make files, Bazel files, continuous integration, and/or other DevOps topics

priority/p1High priorityHigh priority

Status: Open.

Bug

#804 In quantumlib/qsim;

· mhucka opened on Jun 22, 2025

Document NumPy 1 interaction with max simulation size

area/docsInvolves documentation, notebooks, README files, and similarInvolves documentation, notebooks, README files, and similar

area/pythonInvolves the Python code in qsimInvolves the Python code in qsim

contributors welcomeHelp with this would be appreciatedHelp with this would be appreciated

priority/p1High priorityHigh priority

Status: Open.

Task

#863 In quantumlib/qsim;

· mhucka opened on Aug 16, 2025

qsimcirq can handle large circuit?

priority/p1High priorityHigh priority

status/awaiting-responseWaiting on a response from someoneWaiting on a response from someone

Status: Open.

Question

#869 In quantumlib/qsim;

· CoolMLAI opened on Aug 20, 2025

Pybind11 error: Unable to cast Python instance of type &lt;class 'qsimcirq.qsim_avx2.Circuit'&gt; to C++ type '?'

area/c++Involves the C++ code portions of qsimInvolves the C++ code portions of qsim

area/gpuInvolves CUDA, GPUs, and similarInvolves CUDA, GPUs, and similar

priority/p1High priorityHigh priority

Status: Open.

Bug

#870 In quantumlib/qsim;

· YingrongChen opened on Aug 20, 2025

SSE and SSE4 are not equivalent

area/c++Involves the C++ code portions of qsimInvolves the C++ code portions of qsim

area/devopsInvolves build systems, Make files, Bazel files, continuous integration, and/or other DevOps topicsInvolves build systems, Make files, Bazel files, continuous integration, and/or other DevOps topics

priority/p1High priorityHigh priority

Status: Open.

Bug

#892 In quantumlib/qsim;

· mhucka opened on Sep 22, 2025

Provide GPU support in released qsimcirq wheel

area/gpuInvolves CUDA, GPUs, and similarInvolves CUDA, GPUs, and similar

priority/p2Medium priorityMedium priority

Status: Open.

Enhancement

#430 In quantumlib/qsim;

· 95-martin-orion opened on Sep 20, 2021

Dynamically link to CUDA and cuQuantum

area/devopsInvolves build systems, Make files, Bazel files, continuous integration, and/or other DevOps topicsInvolves build systems, Make files, Bazel files, continuous integration, and/or other DevOps topics

area/gpuInvolves CUDA, GPUs, and similarInvolves CUDA, GPUs, and similar

contributors welcomeHelp with this would be appreciatedHelp with this would be appreciated

Status: Open.

Enhancement

#601 In quantumlib/qsim;

· 95-martin-orion opened on Apr 5, 2023

Documentation needs to be reviewed and updated

area/docsInvolves documentation, notebooks, README files, and similarInvolves documentation, notebooks, README files, and similar

contributors welcomeHelp with this would be appreciatedHelp with this would be appreciated

priority/p1High priorityHigh priority

Status: Open.

Task

#891 In quantumlib/qsim;

· mhucka opened on Sep 22, 2025