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Add release note for nalgebra 2q synthesis changes #16129

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12 changes: 12 additions & 0 deletions releasenotes/notes/2q_decomposer_nalgebra-reno-9e5074c7673e9c4d.yaml
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---
performance:
- The internal linear algebra library used by the :class:`.TwoQubitBasisDecomposer`
and :class:`.TwoQubitWeylDecomposer` has been updated to use the
`nalgebra <https://docs.rs/nalgebra/latest/nalgebra/>`__ library internally
for matrix storage and matrix multiplication. This was done to imporve the performance
as nalgebra offers fixed size stack allocated smakk matrix types that have
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@ShellyGarion ShellyGarion May 5, 2026

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smakk is a word?

optimized implmentations of common linear algebra functions. This has led to
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@ShellyGarion ShellyGarion May 5, 2026

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Suggested change
optimized implmentations of common linear algebra functions. This has led to
optimized implementations of common linear algebra functions. This has led to

a speed up in the synthesis performance of these classes and their internal use in the
transpiler for 2q unitary analysis and synthesis. See
`#15928 <https://github.com/Qiskit/qiskit/pull/15928>`__ and
`#15960 <https://github.com/Qiskit/qiskit/pull/15960>`__ for more details.
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