LatticeModelProblem#

class LatticeModelProblem(hamiltonian)[source]#

Bases: BaseProblem

A lattice model problem.

This class specifically deals with handling of LatticeModel type hamiltonians.

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

properties#

a container for additional observable operator factories.

Type:: LatticePropertiesContainer

প্যারামিটার:: hamiltonian (LatticeModel) -- A lattice model class to create second quantized operators.
রেইজেস:: TypeError -- if the provided hamiltonian is not of type LatticeModel.

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.

রিটার্ন টাইপ:: 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.

প্যারামিটার:: mapper (QubitMapper) -- QubitMapper object implementing the mapping of second quantized operators to Pauli operators.
রেইজেস:: ValueError -- If the mapper is a TaperedQubitMapper.
রিটার্নস:: A TaperedQubitMapper with pre-built symmetry specifications.
রিটার্ন টাইপ:: TaperedQubitMapper

interpret(raw_result)[source]#

Interprets a raw result in the context of this transformation.

প্যারামিটার:: raw_result (EigenstateResult | EigensolverResult | MinimumEigensolverResult) -- a raw result to be interpreted
রিটার্নস:: A lattice model result.
রিটার্ন টাইপ:: LatticeModelResult

second_q_ops()#

Returns the second quantized operators associated with this problem.

রিটার্নস:: A tuple, with the first object being the main operator and the second being a dictionary of auxiliary operators.
রিটার্ন টাইপ:: tuple[qiskit_nature.second_q.operators.sparse_label_op.SparseLabelOp, dict[str, qiskit_nature.second_q.operators.sparse_label_op.SparseLabelOp]]