loom.interpreter.applicator.measure_block_syndromes

Copyright (c) Entropica Labs Pte Ltd 2025.

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loom.interpreter.applicator.measure_block_syndromes.measureblocksyndromes(interpretation_step, operation, same_timeslice, debug_mode)[source]

Measure the syndromes of all stabilizers in a block.

The algorithm is the following:

  • A.) For each stabilizer in the block, get the corresponding circuit (template)

    • A.1) Get the stabilizers from the block

    • A.2) Get the stabilizer circuit templates from the block

  • B.) Resolve the circuit with actual channels:

    • B.1) Get the qubit labels from the stabilizer

    • B.2) Get the classical bit labels from the syndrome circuit

    • B.3) Repeat for n_cycle:

      • B.3.1) Find the classical channels (create them if they don’t exist) and create cbits

      • B.3.2) Clone the syndrome circuit and remap the channels

  • C.) Weave circuits together: NOTE we currently assume that the circuits are constructed in order, this is the responsibility of the user.

    • C.1) Check the assumption that all circuits are the same length

    • C.2) Add gates one by one to the intermediate circuit

  • D.) Generate new syndromes for the stabilizers involved

  • E.) Create new detectors for the new syndromes

  • F.) Update the interpretation_step with the new syndromes and detectors

  • G.) Update the interpretation_step with the new circuit

Parameters:

  • interpretation_step (InterpretationStep) – Interpretation step containing the block from which the syndrome should be measured.

  • operation (MeasureBlockSyndromes) – Syndrome measurement operation description.

  • same_timeslice (bool) – Flag indicating whether the operation is part of the same timestep as the previous operation.

  • debug_mode (bool) – Flag indicating whether the interpretation should be done in debug mode. Activating debug mode will enable commutation validation for Block.

Returns:

Interpretation step after the syndrome measurement operation.

Return type:

InterpretationStep