Symmetry-merged evolution: Trotter merging + momentum-sector CTPP - #182
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Symmetry-merged evolution: Trotter merging + momentum-sector CTPP#182AlexSchuckert wants to merge 19 commits into
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…daptive Lindbladian evolution Direct Heisenberg-picture evolution O ← exp(dt·L*)O on an adaptively truncated Pauli-string basis: exact in dt within the working basis, no Trotter splitting. LindbladSpec precompiles Hermitian-Pauli (fast diagonal) and general complex Pauli-sum jumps (σ±, amplitude damping, precomputed L†L); pc_step does two-hop leakage enrichment + predictor/ corrector matrix-free exponential via quspin-expm (MIT), with the truncation policy in one PcStepConfig (max_basis rank cap, admit_basis displacement bound, drop_tol prune, tau_add admission filter). Python: ppvm.Lindbladian with numpy hot path + string convenience API, mimalloc global allocator (~50% peak-RSS cut on adaptive paths), two jupytext demos, tests against dense-Liouvillian / closed-form / eig references. Split 2/4 of the CTPP work; the momentum-sector (orbit-rep) evolution follows in split 3. Full history: branch continuous-time-pauli-propagation. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Two consumers of the translation-symmetry primitive:
Trotter path: PauliSum.symmetry_merge (k=0) and PauliSum.momentum_merge
(k≠0 carried as a real pair, character-weighted fold, |G|-rescaled to
the summing projector so merging after every step is idempotent), with
TranslationGroup and canonicalize_basis_arr{,_complex} /
check_momentum_sector_arr exposed to Python. Inputs validated at the
boundary (ValueError, not panics).
CTPP path: pc_step_orbit_rep — per-step evolution entirely in
orbit-representative form (complex coefficients, phase-aware action,
cached-CSC expm; basis ~|G|× smaller than full-basis evolution,
persisting through every step), with the same PcStepConfig truncation
policy incl. displacement admission.
Split 3/4 of the CTPP work; full history on branch
continuous-time-pauli-propagation.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This was referenced Jul 16, 2026
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Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
# Conflicts: # crates/ppvm-python-native/src/lindblad.rs
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
…ord) — cargo machete Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
bitvec implements BitStore for u64 only on 64-bit targets, so the [u64; 2] word storage broke the wasm32 workspace build. The chunk type is now target-gated: two u64 chunks on 64-bit targets (bit-identical to before), four u32 chunks elsewhere — 128 qubits either way. The chunk loops (anti_commutes / pauli_mul) were already width-agnostic. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
# Conflicts: # crates/ppvm-lindblad/src/lib.rs
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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PR 3 of 4 splitting #178 (stacked on #181). Full history: branch
continuous-time-pauli-propagation.The two consumers of the translation-symmetry primitive from PR 1:
PauliSum.symmetry_merge(k = 0) andPauliSum.momentum_merge(k ≠ 0, complex operator carried as a real pair; character-weighted fold rescaled by |G| to the summing projector, so merging after every gate layer is idempotent).TranslationGroup,canonicalize_basis_arr{,_complex}, andcheck_momentum_sector_arrexposed viappvm._core. All inputs validated at the FFI boundary (ValueError, not panics).pc_step_orbit_rep— per-step adaptive evolution entirely in orbit-representative form (complex coefficients, phase-aware action, same cached-CSC expm engine andPcStepConfigtruncation policy as the real-space step). The live basis is ~|G|× smaller than full-basis evolution, and the reduction persists through every step; observables come out per momentum mode.Tests: momentum-merge correctness incl. k-resolved Trotter convergence vs exact diagonalization; orbit-rep evolution vs full-basis-then-project (exact match); real/complex equivalence at k = 0. Regression gates rerun on this exact tree: L=5 momentum sanity bit-identical to the recorded reference; the τ_add real-space cell reproduces median 5.19e-3 / peak basis 77,820 exactly.
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