hqs_quantum_solver.evolution.observers

Observer functions for the time evolution functions.

Functions

expectation(observables)	Observer for the expectation value of operators.
state()	Observer for the whole state.

Classes

Observer

Protocol for time-step observers that can be used in time evolution functions.

class Observer

Protocol for time-step observers that can be used in time evolution functions.

__call__(t: float, state: ndarray, /) → T_co

Returns the observation for a given value of t and state.

Parameters:

• t (float) – The integration variable.

• state (ndarray) – The state at \(t\).

__init__(*args, **kwargs)

expectation(observables: Iterable[SimpleOperatorProtocol]) → Observer[ndarray]

Observer for the expectation value of operators.

Parameters:

observables (Iterable[SimpleOperatorProtocol]) – List of operators for which to compute the expectation value.

Returns:

Observer that returns a list, where each entry corresponds to the expectation value of the operators given in args.

state() → Observer[ndarray]

Observer for the whole state.

Captures the entire state during time evolution.

Returns:

The observer.