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Fix sparse matrix conversion for SciPy<Real/Imaginary>Evolver (backport #9598) #9600

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Feb 16, 2023
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Fix sparse matrix conversion for SciPy<Real/Imaginary>Evolver (backport #9598) #9600

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8 changes: 4 additions & 4 deletions qiskit/algorithms/time_evolvers/classical_methods/evolve.py
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Original file line number Diff line number Diff line change
Expand Up @@ -109,10 +109,10 @@ def _operator_to_matrix(operator: BaseOperator | PauliSumOp):
"Trying dense computation",
type(operator),
)
try:
op_matrix = operator.to_matrix()
except AttributeError as ex:
raise AlgorithmError(f"Unsupported operator type `{type(operator)}`.") from ex
try:
op_matrix = operator.to_matrix()
except AttributeError as ex:
raise AlgorithmError(f"Unsupported operator type `{type(operator)}`.") from ex
return op_matrix


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7 changes: 5 additions & 2 deletions releasenotes/notes/fix-numpy-eigensolver-sparse-0e255d7b13b5e43b.yaml
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@@ -1,6 +1,9 @@
---
fixes:
- |
Fixed a bug in :class:`~.minimum_eigensolvers.NumPyMinimumEigensolver` and
:class:`~.eigensolvers.NumPyEigensolver` where operators that support conversion
Fixed a bug in the NumPy-based eigensolvers
(:class:`~.minimum_eigensolvers.NumPyMinimumEigensolver` /
:class:`~.eigensolvers.NumPyEigensolver`)
and in the SciPy-based time evolvers (:class:`.SciPyRealEvolver` /
:class:`.SciPyImaginaryEvolver`), where operators that support conversion
to sparse matrices, such as :class:`.SparsePauliOp`, were converted to dense matrices anyways.