qrunch.quantum.groupers.measurement_groups

Module containing classes for measurement groups, which store pauli sums that can be measured simultaneously.

Classes

`MeasurementGroup`	Class that stores pauli sums, that can be measured simultaneously.
`PartialMeasurementGroup`	Class that stores pauli sums, that can be measured simultaneously before shots have been allocated.

class MeasurementGroup

Bases: object

Class that stores pauli sums, that can be measured simultaneously.

All fields are immutable (frozen=True) so an instance can be safely reused.

Parameters:

measurement_basis – The measurement basis to use for the group.
pauli_sums – Mapping between original pauli sum and the part that belongs in the group.
number_of_shots – The number of shots to allocate to this group.

__init__(measurement_basis: MeasurementBasis, pauli_sums: dict[HermitianPauliSum, HermitianPauliSum], number_of_shots: int | None = None) → None

Parameters:

Return type:

None

calculate_expectation_value(measurement: QuantumMeasurement) → dict[HermitianPauliSum, ExpectationValue]

Calculate the expectation value of the given pauli strings from the measurement.

Parameters:

Return type:

dict[HermitianPauliSum, ExpectationValue]

class PartialMeasurementGroup

Bases: object

Class that stores pauli sums, that can be measured simultaneously before shots have been allocated.

Parameters:

measurement_basis – The measurement basis to use for the group.
pauli_sums – Mapping between original pauli sum and the part that belongs in the group.

__init__(measurement_basis: MeasurementBasis, pauli_sums: dict[HermitianPauliSum, HermitianPauliSum]) → None

Parameters:

Return type:

None

assign_shots(number_of_shots: int | None) → MeasurementGroup

Assign a number of shots to this group, returning a new MeasurementGroup.

Parameters:: number_of_shots (int | None) – The number of shots to assign to this group.
Return type:: MeasurementGroup

get_all_pauli_strings() → set[PauliString]

Get all pauli strings in this group.