measure

Contains function measure() for measuring states

class qualg.measure.MeasurementResult(outcome, probability, post_meas_state)

property outcome

Alias for field number 0

property post_meas_state

Alias for field number 2

property probability

Alias for field number 1

qualg.measure.measure(state, kraus_ops)

Measures a state with a given list of Kraus operators describing a POVM.

Parameters

• state (State) – The state to be measured.

• kraus_ops (dict) – Dictionary containing the Kraus operators describing the POVM as values and the outcomes as keys.

Returns

The namedtuple returned contains: * outcome: The outcome of the measurement, i.e. the key of the Kraus operator. * probability: The probability of the outcome. * post_meas_state: The post-measurement state.

Return type

MeasurementResult

Warning

There is no check that the given Kraus operators are actually a valid POVM.