TimeEvolutionProblem

class qiskit.algorithms.TimeEvolutionProblem(hamiltonian, time, initial_state=None, aux_operators=None, truncation_threshold=1e-12, t_param=None, param_value_map=None)

Bases: object(opens in a new tab)

Time 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.

hamiltonian

initial_state

aux_operators

truncation_threshold

t_param

param_value_map

Parameters

• hamiltonian (BaseOperator | PauliSumOp) – The Hamiltonian under which to evolve the system.
• time (float(opens in a new tab)) – Total time of evolution.
• initial_state (QuantumCircuit |Statevector | None) – The quantum state to be evolved for methods like Trotterization. For variational time evolutions, where the evolution happens in an ansatz, this argument is not required.
• aux_operators (ListOrDict[BaseOperator | PauliSumOp] | None) – Optional list of auxiliary operators to be evaluated with the evolved initial_state and their expectation values returned.
• truncation_threshold (float(opens in a new tab)) – Defines a threshold under which values can be assumed to be 0. Used when aux_operators is provided.
• t_param (Parameter | None) – Time parameter in case of a time-dependent Hamiltonian. This free parameter must be within the hamiltonian.
• param_value_map (Mapping[Parameter, complex(opens in a new tab)] | None) – Maps free parameters in the problem to values. Depending on the algorithm, it might refer to e.g. a Hamiltonian or an initial state.

Raises

ValueError(opens in a new tab) – If non-positive time of evolution is provided.

Attributes

time

Methods

validate_params