tqecd.boundary.BoundaryStabilizer

class BoundaryStabilizer(stabilizer: PauliString, collapsing_operations: Iterable[PauliString], measurements: list[RelativeMeasurementLocation], reset_qubits: frozenset[int], forward: bool)

__init__(stabilizer: PauliString, collapsing_operations: Iterable[PauliString], measurements: list[RelativeMeasurementLocation], reset_qubits: frozenset[int], forward: bool)

Represents a stabilizer that has been propagated and is now at the boundary of a Fragment.

Raises:

TQECDException – if source_qubits is empty.

Parameters:

• stabilizer – The propagated stabilizer before any collapsing operation has been applied.

• collapsing_operations – The collapsing operations the stabilizer will have to go through to exit the Fragment.

• measurements – measurement offsets relative to the end of the fragment (even if the created BoundaryStabilizer instance represents a stabilizer on the beginning boundary) of measurements that are involved in this stabilizer.

• reset_qubits – index of the qubit on which reset operations touching the flow are applied. Depending on the value of forward, these indices can either be sources of the stabilizer (if forward is True) or sinks that may or may not commute with the resulting stabilizer.

• forward – True if the stabilizer propagated forward (i.e., ends on measurements), else False.

Methods

__init__(stabilizer, collapsing_operations, ...)	Represents a stabilizer that has been propagated and is now at the boundary of a Fragment.
coordinates(qubit_coordinates)	Compute and return the coordinates of the boundary stabilizer.
is_trivial()
merge(other)	Merge two boundary stabilizers together.
with_measurement_offset(offset)

Attributes

after_collapse	Compute the stabilizer obtained after applying the collapsing operations.
before_collapse	Return the stabilizer obtained before applying the collapsing operations.
collapsing_operations	Iterator on all the collapsing operations defining the boundary this stabilizer is applied to.
has_anticommuting_operations	Check if the instance represents a stabilizer that anti-commutes with at least one of its collapsing operations.
measurements
resets_qubits
source_qubits