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quantumlib / qsim Public

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Fork 202
Star 660

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Issues 35
Pull requests 7
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Release 0.23.0

Open

Overdue by 6 month(s)

•

Due by November 15, 2025

•Last updated May 13, 2026

Release version 0.23.0 of qsim.

42% complete

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0 issues of 12 selected

Open
(12)
Closed
(9)

Not building with cuQuantum SDK (and cirq)

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

priority/p1High priorityHigh priority

Status: Open.

#481 In quantumlib/qsim;

· rugantio opened

on Nov 19, 2021

`cirq.Circuit(cirq.I(cirq.LineQubit(0)))` 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.

#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.

#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.

#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.

#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.

#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.

#772 In quantumlib/qsim;

· mhucka opened

on Jun 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.

#869 In quantumlib/qsim;

· CoolMLAI opened

on Aug 20, 2025

Pybind11 error: Unable to cast Python instance of type <class 'qsimcirq.qsim_avx2.Circuit'> 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.

#870 In quantumlib/qsim;

· YingrongChen opened

on Aug 20, 2025

Provide GPU support in released qsimcirq wheel

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

priority/p2Medium priorityMedium priority

Status: Open.

#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.

#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.

#891 In quantumlib/qsim;

· mhucka opened

on Sep 22, 2025

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