Qiskit / qiskit / 11842190647

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github

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Commit Message

Fix process-based non-determinism in `SparsePauliOp.to_matrix` (#13439)

* Fix process-based non-determinism in `SparsePauliOp.to_matrix`

The simplification step of the summed Pauli terms in
`SparsePauliOp.to_matrix` had introduced a non-determinism via hash-map
iteration.  In practice, the base hash seed was set per initialisation
of the extension module, then stayed the same.  This is hard to detect
from within tests, but caused unexpected numerical behaviour on
different invocations of the same script.

* Use ahash::RandomState

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Co-authored-by: Kevin Hartman <kevin@hart.mn>

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10 existing lines in 3 files now uncovered.

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