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v1.9.0 - Sintered Samples

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@Strilanc Strilanc released this 10 Jul 06:00
· 335 commits to main since this release
v1.9.0
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Strilanc Craig Gidney
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Learn about vigilant mode.

Flagship changes:

  • Released sinter, which uses stim and pymatching to perform multicore Monte Carlo sampling of error correction circuits.
  • Added a python stub file (stim/__init__.pyi) to improve autocompletion in IDEs.

Breaking changes:

  • The "ptb64" format now requires the shot count to be a multiple of 64, both when reading and when writing. (Previously, missing shots resulted in padding with zero'd data, which created a very easy way to get bad data when reading if the number of shots was not known.)
  • The default value of stim.Circuit.shortest_graphlike_error's argument ignore_ungraphlike_errors has changed from from False to True. (Setting it to False can use "remnant edges" that only appear as components of decomposed errors, and so do not correspond to a single physical error mechanism.)

Notable changes:

  • New global methods:
    • stim.main
    • stim.read_shot_data_file
    • stim.write_shot_data_file
  • New stim.DetectorErrorModel methods:
    • stim.DetectorErrorModel.to_file
    • stim.DetectorErrorModel.from_file
  • New stim.Circuit methods:
    • stim.Circuit.without_noise
    • stim.Circuit.flattened
    • stim.Circuit.search_for_undetectable_logical_errors
    • stim.Circuit.to_file
    • stim.Circuit.from_file
  • New stim.TableauSimulator methods:
    • stim.TableauSimulator.c_xyz
    • stim.TableauSimulator.c_zyx
    • stim.TableauSimulator.cx
    • stim.TableauSimulator.do_circuit
    • stim.TableauSimulator.do_pauli_string
    • stim.TableauSimulator.do_tableau
    • stim.TableauSimulator.h_xz
    • stim.TableauSimulator.num_qubits
    • stim.TableauSimulator.peek_x
    • stim.TableauSimulator.peek_y
    • stim.TableauSimulator.peek_z
    • stim.TableauSimulator.postselect_x
    • stim.TableauSimulator.postselect_y
    • stim.TableauSimulator.postselect_z
    • stim.TableauSimulator.reset_x
    • stim.TableauSimulator.reset_y
    • stim.TableauSimulator.reset_z
    • stim.TableauSimulator.zcx
    • stim.TableauSimulator.zcy
    • stim.TableauSimulator.zcz
  • New stim.Tableau methods:
    • stim.Tableau.to_unitary_matrix
  • New method options:
    • obs_path=None and obs_format for stim.CompiledDetectorSampler.sample_file
    • obs_path=None and obs_format for stim.CompiledMeasurementsToDetectionEventsConverter.convert_file
    • ignore_decomposition_failures=False for stim.Circuit.detector_error_model
    • block_decompose_from_introducing_remnant_edges=False option for the stim.Circuit.detector_error_model
    • bit_pack_result=False for stim.CompiledMeasurementsToDetectionEventsConverter.convert
  • Functional changes:
    • Error analysis now attempts to avoid introducing remnant edges unless absolutely necessary (improves detector error models)
    • Error analysis now supports ELSE_CORRELATED_ERROR instructions as long they occur in contiguous blocks started by a CORRELATED_ERROR
    • The stim python package now includes the stim command line tool. Much easier than building it for yourself.
    • The floating point accuracy of stim.TableauSimulator.state_vector has been substantially improved (e.g. all zeros are now exact)
    • The method signatures shown in the API reference are now more accurate, matching the ones in __init__.pyi

Bug fixes:

  • Worked around the pseudo random number generator state being duplicated when using multiprocessing with start method "fork". Samplers now seed from external entropy when constructed, instead of using entropy acquired at startup.
  • Fixed various reported build failures related to MacOS and Apple M chips.
  • Fixed setup.py not forcing UTF8 encoding when loading README.md, causing crashes on systems configured to use other encodings by default.
  • Fixed stimcirq not understanding probabilistic cirq.DensePauliString gates.
  • Worked around an issue where pytest gives useless failure messages for asserts involving stim objects.
  • Fixed an infinite loop in stim.Circuit.get_detector_coords.
  • Fixed complex indices like stim.Circuit()[1j] crashing the python interpreter (by switching to latest version of pybind11).
  • Fix loop folding during error analysis incorrectly folding loops with observables including measurements from only the last few iterations
  • Fixed a segfault in measurement-to-detection-event conversion related to failing to ignore noise channels
  • Fixed a bug in measurement-to-detection-event conversion where some OBSERVABLE_INCLUDE instructions were being forgotten
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