loom_repetition_code.applicator.merge

Copyright 2024 Entropica Labs Pte Ltd

Licensed under the Apache License, Version 2.0 (the “License”); you may not use this file except in compliance with the License. You may obtain a copy of the License at

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loom_repetition_code.applicator.merge.find_merge_circuit(interpretation_step, check_type, new_data_qubits, circuit_name)[source]

Generates the circuit required to reset the new data that get added during the merge operation.

Parameters:

  • interpretation_step (InterpretationStep) – Interpretation step containing the blocks to be merged.

  • check_type (str) – Type of stabilizers in the codes.

  • new_data_qubits (list[tuple[int,int]]) – List of new data qubits to reset.

  • circuit_name (str) – Name of the circuit.

Returns:

Circuit to reset the new data and ancilla qubits.

Return type:

Circuit

loom_repetition_code.applicator.merge.find_new_stabilizers(blocks, check_type)[source]

Find the new stabilizers for the merged block.

Parameters:

  • blocks (list[RepetitionCode]) – List of blocks (capped at two) to be merged.

  • check_type (str) – Type of stabilizers in the codes.

Returns:

New stabilizers for the merged block.

Return type:

list[Stabilizer]

loom_repetition_code.applicator.merge.get_logical_operator_and_evolution(blocks, check_type, new_data_qubits)[source]

Get the new logical operators and evolution for the merged block.

Parameters:

  • blocks (list[RepetitionCode]) – List of blocks (capped at two) to be merged.

  • check_type (str) – Type of stabilizers in the codes.

  • new_data_qubits (list[tuple[int,int]]) – List of new data qubits to be added.

Returns:

New logical operators and evolution for the merged block.

Return type:

tuple[list[list[PauliOperator]], list[dict]]

loom_repetition_code.applicator.merge.get_new_data_qubits_info(blocks)[source]

Get the new data qubits to be added in the merged block.

Parameters:

blocks (list[RepetitionCode]) – List of blocks (capped at two) to be merged.

Returns:

List of new data qubits to be added.

Return type:

list[tuple[int, int]]

loom_repetition_code.applicator.merge.merge(interpretation_step, operation, same_timeslice, debug_mode)[source]

Merge two Repetition Code chains.

The algorithm is the following:

  • A.) DATA QUBITS

    • A.1) Find the new data qubits to be added in the merged block

  • B.) CIRCUIT

    • B.1) Find the circuit for the merge operation

    • B.2) Add the circuit to the interpretation step

  • C.) - STABILIZERS

    • C.1) Find the new stabilizers for the merged block

  • D.) LOGICAL OPERATORS

    • D.1) Find new logical operator and evolution

    • D.2) Update the logical operator history

  • E.) NEW BLOCK AND NEW INTERPRETATION STEP

    • E.1) Create the new block

    • E.2) Update the block history

Parameters:

  • interpretation_step (InterpretationStep) – Interpretation step containing the blocks to merge.

  • operation (Merge) – Merge 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 merge operation.

Return type:

InterpretationStep

loom_repetition_code.applicator.merge.merge_consistency_check(interpretation_step, operation)[source]

Check the consistency of the merge operation.

Parameters:

  • interpretation_step (InterpretationStep) – InterpretationStep containing the blocks to merge.

  • operation (Merge) – Merge operation description.

Returns:

Blocks to merge.

Return type:

tuple[RepetitionCode,RepetitionCode]