tqecd.fragment.Fragment

class Fragment(circuit: Circuit)

__init__(circuit: Circuit)

A sub-circuit guaranteed to end with a moment filled by measurement instructions.

Fragment instances represent sub-circuits that contain:

1. zero or more moments exclusively composed of reset, annotation or

   noisy-gate instructions,

2. zero or more moments composed of “computation” instructions (anything

   that is not a measurement or a reset),

3. one moment exclusively composed of measurement, annotation

   or noisy-gate instructions.

Raises:

• TQECDException – if the provided stim.Circuit instance contains a stim.CircuitRepeatBlock instance.

• TQECDException – if any moment from the provided circuit contains both a measurement (resp. reset) and a non-measurement (resp. non-reset) operation. Note that annotations and noisy-gates instructions (measurements excluded) are ignored, and so are excluded from this condition.

• TQECDException – if the provided circuit does not end with at least one measurement.

Parameters:

circuit – the circuit represented by the instance.

Methods

__init__(circuit)	A sub-circuit guaranteed to end with a moment filled by measurement instructions.
get_tableau()

Attributes

circuit
measurements	Get the measurement instructions at the back on the Fragment.
measurements_qubits
num_measurements
resets	Get the reset instructions at the front on the Fragment.