Flagship changes:

• Addedstim.Circuit.flow_generators for finding the stabilizer flows of a circuit.
• Addedstim.Circuit.time_reversed_for_flows for reversing circuits containing resets and measurements.
• Addedsinter.Sampler for customizing sinter to more general Monte Carlo sampling tasks.

Notable changes:

• Addedstim.Circuit.flow_generators
• Addedstim.Circuit.insert
• Addedstim.Circuit.pop
• Addedstim.Circuit.time_reversed_for_flows
• Addedstim.Circuit.to_crumble_url
• Addedstim.Circuit.to_quirk_url
• Addedstim.CircuitInstruction.num_measurements
• Addedstim.CircuitInstruction.target_groups
• Addedstim.CircuitRepeatBlock.num_measurements
• Addedstim.DemInstruction.target_groups
• Addedstim.FlipSimulator.clear
• Addedstim.FlipSimulator.copy
• Addedstim.GateData.hadamard_conjugated
• Addedstim.GateData.is_symmetric_gate
• stim.CompiledDetectorSampler.sample gainedobs_out=None anddets_out=None arguments
• stim.Circuit.to_crumble_url gainedskip_detectors=False andmark=None arguments
• stim.CircuitInstruction.__init__ gained the ability to parse single lines from a stim circuit file
• stim.DemInstruction.__init__ gained the ability to parse single lines from a detector error model file
• stim.DemTarget.__init__ gained the ability to parse targets from detector error mode files (e.g.stim.DemTarget("D2"))
• In stim's gate data, the generalized inverse ofR{X,Y,Z} is nowM{X,Y,Z} instead ofMR{X,Y,Z}
• Added support for viewing and editing detectors and observables in crumble
• Reduced the amount of copying during sampling, speeding up detector sampling by around 25%
• Began collecting papers with available stim circuits atdoc/circuit_data_references.md

Notable changes to diagrams:

• stim.Circuit.diagram gained arows=None argument, for controlling layout
• Added "tick #" labels to timeslice diagrams
• Improvedstim.Circuit.detector_error_model error messages to suggest code for drawing a diagram of the problem
• Match graph diagrams now highlight observable-flipping hyper errors (purple instead of blue)
• In match graph diagrams, nodes with observable-crossing boundary edges are now colored red instead of black
• The detector indicator in 3d match graph diagrams is not flat anymore, so it's easier to see from all angles
• stim.Circuit.diagram("detslice") now draws a pink circle where bad detectors anticommute with dissipative operations, instead of raising an exception
• Added-html variants of svg diagrams (e.g.circuit.diagram("detslice-html")
  • Outputs a little HTML viewer of the svg diagram, with a resizing tab, which works better in notebooks than a raw SVG
• detslice diagrams no longer raise an exception for circuits with anticommuting detectors. Instead, a diagram highlighting the anticommutation is returned.
• Improved the heuristics for using Bezier curves instead of straight lines

Notable changes to sinter:

• Addedsinter.Sampler
• Addedsinter.CompiledSampler
• Added named sinter samplerperfectionist
• Any sinter decoder can now indicate shots to discard, by adding an extra byte column to the returned observable data (0=keep, else=discard)
• sinter collect now distributes workers evenly over tasks, instead of focusing on one task at a time
• sinter collect now never switches a worker to a new task until their current task is done
• Addedsinter plot --point_label_func command line argument
• Addedsinter plot --dpi for increasing resolution of plots
• Expandedsinter plot --group_func to take dictionary arguments
  • The"color" key of the dictionary controls color groups
  • The"linestyle" key of the dictionary controls linestyle groups
  • The"marker" key of the dictionary controls marker groups
  • The"label" key of the dictionary controls labels of curves in the legend
  • The"sort" key of the dictionary controls order of curves in the legend
• sinter collect --processes now defaults to"auto" (number of CPUs) if not specified
• sinter plot --show is now implied when--out isn't specified
• Addedsinter plot --preprocess_stats_func for specifying a python expression to process stats before plotting
• Addedsinter.TaskStats.with_edits
• Added a safety check tosinter.TaskStats.__add__, raising an exception if decoder/json_metadata disagree despite strong ids agreeing
• Added supported decoder"hypergraph_union_find"
• Added supported decoder"mw_parity_factor"

Notable bug fixes:

• FixedHERALDED_PAULI_CHANNEL_1 permuting X/Y/Z/ error channels 😱😱😱
• Fixed various internal methods not correctly propagating Pauli terms throughMXX,MYY, andMZZ instructions that operated on the same qubit more than once 😱
• Fixedstim.Circuit.with_inlined_feedback incorrectly ordering operations fused by the removal of a feedback operation
• Fixedstimcirq.cirq_circuit_to_stim_circuit not addingTICKs from multi-momentCircuitOperation blocks
• FixedMPAD targets counting towardsstim.Circuit.num_qubits
• Fixedstim.PauliString.{before,after} not supportingSPP andSPP_DAG
• Fixedstim.PauliString.before refusing to cross reset gates
• Fixed sinter failing to create plots for data points with extremely large shot counts
• Fixedstim.Tableau.from_stabilizers error messages claiming stabilizers were redundant when they actually anticommuted
• Fixed incompatibility with numpy v2
• Fixed incompatibility with new version of scipy (the linear regression type moved)

Special thanks to this release contributors:

@aebrahimi
@inmzhang
@qec-pconner
@dougthor42
@nelimee
@mghibaudi
@folded
@AlexBourassa

Contributors