Perf: reduced-op eigensolver - #97

Merged

mrossinek merged 27 commits into

Qiskit:mainfrom

aeddins-ibm:perf-reduced-op-eigensolver

Aug 31, 2026

Commits on Jul 17, 2026

perf: solve the commutator spectral norm via symplectic reduction
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97dd335

Commits on Jul 18, 2026

lint
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727ffdd
add tests: reduce_op / get_extremal_eigenvalue
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8f6647e
try to help type checker
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034ac93
try again to help type checker
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0e47ee1
fix false-positive typo
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0191e4b
update test pickles
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eef4e98

Commits on Aug 17, 2026

Simplify row-reduction by using `anticommutes()`
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b3478e0

Commits on Aug 18, 2026

clean up `_symplectic_gram_schmidt()`
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0de9e91
add _commutation_matrix() subroutine
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4b64943
clean up `_xor_row_reduce` (now `_get_basis`)
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fff2060
update _reduce_operator()
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f669f6b
delete unused _logical_generators()
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0b33311
update get_extremal_eigenvalue()
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e1f643b
update (and simplify) tests
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a1ccff1
lint
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cfa4724

Commits on Aug 27, 2026

fix: don't clamp the per-sector eigenvalue minimum at zero

mrossinek
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claude
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9e034e3
fix: keep the constant value of identity-only operators

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claude
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9204775
docs: note that the tight Davidson tol default is bypassed by the bounds path

mrossinek
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claude
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d2f6f2d
docs: add release note for the get_extremal_eigenvalue fixes

mrossinek
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claude
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889a021
Merge branch 'main' into perf-reduced-op-eigensolver
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8fd8831

Commits on Aug 28, 2026

shorten AI verbosity
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9d7ee5d
change default atol_eigenvalue from 1e-8 to 1e-10
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b634749
reduce-op perf release note
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001c239
add "lower default atol_eigenvalue" to reno
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9d43287
update renos
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c6601d3
lint
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532ed0d