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Choose between with and without Cartesian prod.#4

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jrm874 wants to merge 1 commit intocaleb-johnson:Rikenfrom
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Choose between with and without Cartesian prod.#4
jrm874 wants to merge 1 commit intocaleb-johnson:Rikenfrom
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@jrm874 jrm874 commented Oct 10, 2025

Modify SHCI/input.h SHCI/input.cpp and SHCI/SHCI.cpp to allow to perform diagonalizations in subspaces which are not defined by the cartesian product of alpha and beta determinants.

If the string alpha_beta_cartesian_product is present in the Dice inputfile input.dat, then the Cartesian product between the determinants in AlphaDets.bin and BetaDets.bin is taken to define the subspace. Otherwise, the element wise union of the strings in AlphaDets.bin and BetaDets.bin defines the diagonalization subspace.

The draft for the interface for the dice-solver Qiskit addon can be found here Qiskit/qiskit-addon-dice-solver#94

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