BaseProblem

class BaseProblem(hamiltonian)

ベースクラス: object

The base representation of a second-quantization problem.

If none of the specific subclasses of this class fit your use case, you can instantiate this class itself with your custom Hamiltonian instance and pass it into one of the available algorithms.

The following attributes can be read and updated once the BaseProblem object has been constructed.

properties

a container for additional observable operator factories.

Type:

PropertiesContainer

パラメータ:

• driver – A driver encoding the molecule information.

• transformers – A list of transformations to be applied to the driver result.

• main_property_name – A main property name for the problem

Attributes

hamiltonian

Returns the hamiltonian wrapped by this problem.

Methods

get_default_filter_criterion()

Returns a default filter criterion method to filter the eigenvalues computed by the eigen solver. For more information see also filter_criterion().

In the fermionic case the default filter ensures that the number of particles is being preserved.

戻り値の型:

Callable[[list | ndarray, float, list[float] | None], bool] | None

get_tapered_mapper(mapper)

Builds a TaperedQubitMapper from one of the mappers. This simplifies the identification of the Pauli operator symmetries and of the symmetry sector in which lies the solution of the problem.

パラメータ:

mapper (QubitMapper) – QubitMapper object implementing the mapping of second quantized operators to Pauli operators.

例外:

ValueError – If the mapper is a TaperedQubitMapper.

戻り値:

A TaperedQubitMapper with pre-built symmetry specifications.

戻り値の型:

TaperedQubitMapper

interpret(raw_result)

Interprets an EigenstateResult in the context of this problem.

パラメータ:

raw_result (EigenstateResult | EigensolverResult | MinimumEigensolverResult) – an eigenstate result object.

戻り値:

An interpreted EigenstateResult in the form of a subclass of it. The actual type depends on the problem that implements this method.

戻り値の型:

EigenstateResult

second_q_ops()

Returns the second quantized operators associated with this problem.

戻り値:

A tuple, with the first object being the main operator and the second being a dictionary of auxiliary operators.

戻り値の型:

tuple[qiskit_nature.second_q.operators.sparse_label_op.SparseLabelOp, dict[str, qiskit_nature.second_q.operators.sparse_label_op.SparseLabelOp]]