feat: trajectory simulator (4/5) (#1856)#1861
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Add TrajectorySimulator on top of the exact-simulator core: a jitted Kraus-stack kernel for programs with measurements and resets, batched sample() that discards states, and data-parallel multi-device sampling via jax.pmap. Includes qutrit, compression, and Surface-17 benchmark tests. Part of splitting 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 4 of 5, stacked on #1860 — review/merge in order. Closes #1856.This PR adds
TrajectorySimulatoron top of the exact-simulator core: a Monte-Carlo trajectory simulator for programs with measurements and resets. Measurements and Kraus channels are compiled into a single homogeneous, zero-padded Kraus stack driven by one reusable jitted kernel (jax.lax.scan+jax.lax.switch), so repeated sampling batches reuse a single compilation.sample()streams trajectories in batches and discards state vectors, and runs data-parallel across multiple devices viajax.pmap(one independent replica per device, no cross-device communication).It also extends
ProgramSimulatorto resolve measurements as sampledQuantumInstruments (the"instrument"resolver path) and adds the trajectory compressor barriers. Tests cover the trajectory pipeline, qutrit trajectories and noise channels, compression invariants, and a Surface-17 benchmark fixture.The dynamic-shape trajectory simulator that also builds on this base lands in the final PR.
Stack
Tracked in #1863.