feat: experimental exact simulators (3/5) (#1855)#1860
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#1855) Add the pyquil.simulation core (_resolver pipeline + vectorized gate constructor) and the grad-able PureStateVectorSimulator and DensityMatrixSimulator, with qutrit support and noise-model integration. Restore the density-matrix ResetChannel tests deferred from #1854. Part of splitting PR #1848 into a reviewable stack. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Bencher Report| Branch | 1855-experimental-exact-simulators |
| Testbed | ci-runner-linux |
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| Benchmark | Latency | seconds (s) |
|---|---|---|
| test/benchmarks/test_program.py::test_copy_everything_except_instructions | 📈 view plot | 10.53 s |
| test/benchmarks/test_program.py::test_instructions | 📈 view plot | 3.34 s |
| test/benchmarks/test_program.py::test_iteration | 📈 view plot | 3.30 s |
This was referenced Jul 4, 2026
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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 3 of 5, stacked on #1859 — review/merge in order. Closes #1855.This PR adds the new
pyquil.simulationcore and the two exact simulators:PureStateVectorSimulator— jit/grad-friendly evolution for gate-only programs.DensityMatrixSimulator— jit/grad-friendly density-matrix evolution for any program, optionally with aNoiseModel.Both are backed by quax, support qutrit/qudit registers, and share the new
_resolver.pypipeline (program expansion, qubit remapping, DAG construction, and greedy operator compression) plus a vectorized gate constructor that keeps compile time proportional to the number of distinct gate kinds rather than gate count. The architecture is documented in the newsimulation_architecture.rst.The trajectory simulators that build on this same base (
TrajectorySimulator,DynamicTrajectorySimulator) land in the following PRs, so_simulator.pyhere contains only the grad-able family. This PR also restores the density-matrix-basedResetChannelverification tests that were deferred from #1854.Stack
Tracked in #1863.