v0.9.0

Qiskit Machine Learning 0.9.0

This release is primarily a compatibility and migration release, bringing Qiskit Machine Learning forward to the Qiskit 2.0 / V2 primitives ecosystem, while also delivering API enhancements (notably in classifiers and optimizers), tightening supported Python versions, and reducing the optional dependency surface.

Highlights

• Migrated to Qiskit 2.0 and updated internal integrations to the newer primitives stack (e.g., moving to V2 sampler/estimator patterns and aligning circuit-library usage).

• Python support updated: Python 3.9 dropped, minimum is now Python ≥ 3.10 (and Python 3.13 support was added during the cycle).

What's Changed

• Fix StackOverflow formatting typo in README.md by @edoaltamura in #847
• Post release 0.8 by @edoaltamura in #844
• Cleanup and bugfix to support different primitives. (#55) by @OkuyanBoga in #855
• Docs 0p8 clean by @edoaltamura in #857
• Remove fastdtw as a dependency by @edoaltamura in #861
• ci(mergify): upgrade configuration to current format by @mergify[bot] in #860
• [Docs] Fix TOCs and update QNN derived primitives by @edoaltamura in #862
• Pin Qiskit to <1.3 as temporary fixed by @edoaltamura in #865
• Added callback function support for adam-amsgrad optimizer. by @OkuyanBoga in #869
• Cumulative update to extend the V2 support for algorithms, updated tutorials, and partial multiclass support for VQC. by @OkuyanBoga in #870
• Add predict_proba Support to PegasosQSVC and NeuralNetworkClassifier by @OkuyanBoga in #871
• Restore latest Qiskit 1.3+ by @edoaltamura in #875
• Extended support for different V2 transpilers from different backends. by @OkuyanBoga in #879
• Fix callback compatibility for trainable_model by @OkuyanBoga in #878
• Update migration guide by @OkuyanBoga in #884
• Update SamplerQNN docs by @edoaltamura in #886
• Remove psutil from requirements.txt by @iyanmv in #894
• Modified test_qsvr.py and test_fidelity_quantum_kernel_qsvr.py files for regression tasks by @rockywick in #900
• Adhoc now supports n>3, and new arguments by @RishiNandha in #902
• Pin Qiskit to <2 in next release by @edoaltamura in #904
• Fix CI for mypy and add explicit shape for COO by @woodsp-ibm in #919
• Add python 3.13 support by @edoaltamura in #923
• Attempt to remedy random CI failures by @woodsp-ibm in #925
• Add SBPLX optimizer by @edoaltamura in #924
• Fix for issue #911 by @woodsp-ibm in #926
• Constrain qiskit versions in tox.ini by @edoaltamura in #927
• Update intersphinx mapping and other URLs pointing to IQP Classic by @arnaucasau in #933
• Add citation of ArXiv paper by @edoaltamura in #942
• Fixes mypy failure with latest mypy 1.16.0 by @woodsp-ibm in #944
• Deprecate BlueprintCircuit based circuit usage by @woodsp-ibm in #945
• Add Arxiv shield to README.md by @edoaltamura in #947
• Update serialising methods and instructions by @edoaltamura in #951
• Add a release note for #945 by @woodsp-ibm in #953
• Pin scipy to <1.16 and temporary workaround by @edoaltamura in #964
• Update Contributing Guide with macOS spellcheck by @edoaltamura in #962
• Pin scikit-learn for CI by @woodsp-ibm in #970
• Bump actions/download-artifact from 4 to 5 by @dependabot[bot] in #972
• Update tutorials to use circuit library functions by @woodsp-ibm in #968
• Bump actions/checkout from 4 to 5 by @dependabot[bot] in #974
• Fix minor typos by @q-inho in #971
• Added Entanglement Concentration Dataset for 3 and 4 qubits for Benchmarking Binary Classifiers by @RishiNandha in #915
• Make tests compatible with SciPy 1.16 by @edoaltamura in #966
• Update trainable_model.py to assign callback function to non-scipy optimiser by @OkuyanBoga in #976
• Update CODEOWNERS by @edoaltamura in #980
• Correct output shape in EstimatorQNN tutorial 01 by @edoaltamura in #982
• Change self._num_features in ValueError message by @edoaltamura in #981
• Bump actions/setup-python from 5 to 6 by @dependabot[bot] in #986
• Bump actions/download-artifact from 5 to 6 by @dependabot[bot] in #998
• Bump actions/upload-artifact from 4 to 5 by @dependabot[bot] in #999
• Bump actions/checkout from 5 to 6 by @dependabot[bot] in #1001
• Drop Python 3.9 support after EoL by @shalini9894 in #1002
• Fix typo in README.md by @edoaltamura in #1004
• Bump actions/download-artifact from 6 to 7 by @dependabot[bot] in #1006
• Bump actions/upload-artifact from 5 to 6 by @dependabot[bot] in #1007
• Update CODEOWNERS by @edoaltamura in #1009
• Improve README with additional links and clarity by @edoaltamura in #1008
• Migrate the library to Qiskit 2.0 by @Siddharthgolecha in #973
• Migrate QGT and QFI from qiskit-algorithms by @edoaltamura in #996
• Pre-release v.0.9 by @edoaltamura in #1012
• Update CODEOWNERS and pre-release cleanup by @edoaltamura in #1013

New Contributors

• @iyanmv made their first contribution in #894
• @rockywick made their first contribution in #900
• @RishiNandha made their first contribution in #902
• @shalini9894 made their first contribution in #1002
• @Siddharthgolecha made their first contribution in #973

Full Changelog: 0.8.0...0.9.0