CorrelationMatrix

class pulser.backend.CorrelationMatrix(*, evaluation_times=None, one_state=None, tag_suffix=None)

Stores the correlation matrix for the current state.

The correlation matrix is calculated as [[<φ(t)|n_i n_j|φ(t)> for j in qubits] for i in qubits] where n_k = |one_state><one_state|.

Parameters:

evaluation_times (Sequence[float] | None, default: None) – The relative times at which to compute the correlation matrix. If left as None, uses the default_evaluation_times of the backend’s EmulationConfig.
one_state (Literal['u', 'd', 'r', 'g', 'h', 'x'] | Literal['0', '1'] | None, default: None) – The eigenstate to measure the population of in the correlation matrix. Can be left undefined if the state’s eigenstates form a known eigenbasis with a defined “one state”.
tag_suffix (str | None, default: None) – An optional suffix to append to the tag. Needed if multiple instances of the same observable are given to the same EmulationConfig.

Attributes

`tag`	Label for the observable, used to index the Results object.
`uuid`	A universal unique identifier for this instance.

Methods

Calculates the observable to store in the Results.

Signatures

apply(*, state, hamiltonian, **kwargs)

Calculates the observable to store in the Results.

property tag: str

Label for the observable, used to index the Results object.

Within a Results instance, all computed observables must have different tags.