loom_rotated_surface_code.operations.rsc_operation

Copyright 2024 Entropica Labs Pte Ltd

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class loom_rotated_surface_code.operations.rsc_operation.AuxCNOT(*args, **kwargs)[source]

Bases: CodeOperation

Apply a CNOT operation between two blocks using a grow-split-merge-shrink sequence.

Parameters:

input_blocks_name (tuple[str, str]) – Names of the control and target blocks, respectively.

input_blocks_name: tuple[str, str]
class loom_rotated_surface_code.operations.rsc_operation.LogicalPhaseViaYwall(*args, **kwargs)[source]

Bases: CodeOperation

Apply a logical phase gate to a RotatedSurfaceCode block by:

1. Growing it towards the right/left or bottom/top depending on the orientation of the X boundary of the block. If the X boundary is horizontal, the block can be grown to the right or left. If the X boundary is vertical, the block can be grown to the top or bottom. 2. Moving corners 3. Measuring a wall of qubits in the Y basis 4. Getting the block back to its original size

Parameters:

  • input_block_name (str) – Name of the block to apply the logical phase gate.

  • growth_direction (Direction) – Direction in which to grow the block. This is the direction of the X boundary of the block. If the X boundary is horizontal, the block has to be grown to the right or left. If the X boundary is vertical, the block has to be grown to the top or bottom.

growth_direction: Direction
input_block_name: str
class loom_rotated_surface_code.operations.rsc_operation.MoveBlock(*args, **kwargs)[source]

Bases: CodeOperation

Move the selected block 1 unit in the chosen direction in a fault-tolerant manner. The SWAP operation occurs as part of the syndrome extraction round, allowing the block to remain fault tolerant throughout the move.

Note

1 unit is defined as the distance between two adjacent qubits (with equal unit vectors) in the block. For example, moving from (0, 0, 0) to (1, 0, 0) is a 1-unit move in the x-direction (i.e., to the “right”).

The possible directions are:

  1. Direction.TOP (top) – Moving the block toward the top; all qubits are shifted by (0, -1, 0)

  2. Direction.BOTTOM (bottom) – Moving the block toward the bottom; all qubits are shifted by (0, 1, 0)

  3. Direction.LEFT (left) – Moving the block toward the left; all qubits are shifted by (-1, 0, 0)

  4. Direction.RIGHT (right) – Moving the block toward the right; all qubits are shifted by (1, 0, 0)

Parameters:

  • input_block_name (str) – Name of the block to move.

  • direction (Direction) – Direction in which to move the block.

direction: Direction
input_block_name: str
class loom_rotated_surface_code.operations.rsc_operation.RotateBlock(*args, **kwargs)[source]

Bases: CodeOperation

Rotate a block by 90 degrees in a fault-tolerant manner. This modifies both the bulk and the boundaries of the block.

E.g. RotateBlock on the following rotated surface code block:

           x                               z
  o --- o --- o                   o --- o --- o
z |  x  |  z  |                 x |  z  |  x  |
  o --- o --- o      Rotate       o --- o --- o
  |  z  |  x  | z      ->         |  x  |  z  | x
  o --- o --- o                   o --- o --- o
     x                               z
Parameters:

  • input_block_name (str) – Name of the block to rotate.

  • grow_direction (Direction) – Direction in which to grow the block so that the rotation can be done in a fault-tolerant manner.

grow_direction: Direction
input_block_name: str
class loom_rotated_surface_code.operations.rsc_operation.TransversalHadamard(*args, **kwargs)[source]

Bases: CodeOperation

Apply a Transversal Hadamard on a block.

Parameters:

input_block_name (str) – Name of the block to apply the transversal hadamard gates.

input_block_name: str