EvolutionProblem

class EvolutionProblem(hamiltonian, time, initial_state, aux_operators=None, truncation_threshold=1e-12, t_param=None, hamiltonian_value_dict=None)

Bases: object

Evolution problem class.

This class is the input to time evolution algorithms and must contain information on the total evolution time, a quantum state to be evolved and under which Hamiltonian the state is evolved.

Parameters

• hamiltonian (OperatorBase) – The Hamiltonian under which to evolve the system.
• time (float) – Total time of evolution.
• initial_state (Union[StateFn, QuantumCircuit]) – Quantum state to be evolved.
• aux_operators (Union[List[Optional[OperatorBase]], Dict[str, OperatorBase], None]) – Optional list of auxiliary operators to be evaluated with the evolved initial_state and their expectation values returned.
• truncation_threshold (float) – Defines a threshold under which values can be assumed to be 0. Used when aux_operators is provided.
• t_param (Optional[Parameter]) – Time parameter in case of a time-dependent Hamiltonian. This free parameter must be within the hamiltonian.
• hamiltonian_value_dict (Optional[Dict[Parameter, complex]]) – If the Hamiltonian contains free parameters, this dictionary maps all these parameters to values.

Raises

ValueError – If non-positive time of evolution is provided.

Methods

validate_params

Attributes

time