Add Suzuki-Trotter circuit primitive#603
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Introduce Hamiltonian-simulation support for Suzuki-Trotter product formulas based on flattened Pauli terms. Add make_trotter_terms() for host-side spin_op decomposition and apply_trotter() as the QPU-facing primitive for first-, second-, and fourth-order formulas. Expose the primitive through Python bindings, including Python-side SpinOperator term extraction. Document identity-term/global-phase handling for interference-sensitive algorithms. Add C++ and Python tests covering term extraction, invalid inputs, identity handling, multi-order kernel validation against product-formula and exact-diagonalization references, and a 4-qubit Hamiltonian with more than eight Pauli terms. Signed-off-by: Scott Thornton <wsttiger@gmail.com>
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Summary
Add a Suzuki-Trotter product-formula circuit primitive to the solvers library.
cudaq::solvers::make_trotter_terms(...)for host-sidespin_opdecomposition into coefficients, Pauli words, identity coefficient, and qubit count.cudaq::solvers::apply_trotter(...)as a QPU-facing primitive supporting first-, second-, and fourth-order product formulas.SpinOperator/SpinOperatorTermhandling.Validation
./unittests/test_trotter --gtest_color=no-> 7 passedpytest -q libs/solvers/python/tests/test_trotter.py-> 8 passedgit diff --check-> clean