Support for eigen of dual operator#1670
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mtfishman
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Sep 18, 2025
Co-authored-by: Matt Fishman <mtfishman@users.noreply.github.com>
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@mtfishman does this PR look ok to you now that tests are passing? (Except Jenkins which I'm not sure about.) |
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Looks good to me. Test failures are unrelated, it may be related to a cuTENSOR issue discussed here: JuliaGPU/CUDA.jl#2881. If I'm following that thread correctly, an explanation might be that our Jenkins setup is running on a GPU that is not supported by the latest versions of cuTENSOR. |
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This PR fixes the
eigenfunction to handle fermionic matrices or operators which have an In,Out index ordering (e.g. "dual operators") such as density matrices or density-matrix-like messages. It also includes new tests.Specifically, in cases where the tensor components are a Hermitian positive semidefinite (HPSD) matrix, then we want eigen to return a diagonal "D" ITensor which has non-negative entries when its indices are in the In, Out ordering.
Commits: