feat: dynamic-shape trajectory simulator (5/5) (#1857)#1862
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Add DynamicTrajectorySimulator: an eager, single-trajectory simulator whose qudit dimensions grow and squeeze at runtime, keeping leakage-aware state far below the full 3**n in the low-leakage regime. Completes the split of PR #1848. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Part of the effort to land the experimental noise model and simulation module (originally PR #1848, branch
nonbreaking-noise-model) as a reviewable stack. This is PR 5 of 5, stacked on #1861 — review/merge in order. Closes #1857.This final PR adds
DynamicTrajectorySimulator: an eager, single-trajectory simulator whose per-qudit dimensions grow and shrink at runtime. A qudit is promoted to dimension 3 only when an operator can populate its leakage level and squeezed back to 2 once that level empties, so in the realistic low-leakage regime the stored state stays far below the full3**n. Unlike the other simulators it applies one operator at a time (shapes are data-dependent, so it is notjax.jit/grad-compilable) and carries a bounded truncation error controlled bysqueeze_tol.With this PR the stack's content matches the original #1848 branch (the five branches together reconstruct it exactly, modulo the per-PR version bumps).
Stack
Tracked in #1863.