FermiHubbard.operator_to_mat

static FermiHubbard.operator_to_mat(generator, num_species, basis=None)

Compute the matrix representation of the fermion operator.

Parameters:

• generator (FermionicOp) – fermion operator of which to compute the matrix representation.

• num_species (int) – Number of fermion species which defaults to 1.

• basis (Optional[FermionicBasis]) – The basis in which to return the matrix. If None is given then the matrix will be returned in the full basis.

Return type:

csc_matrix

Returns:

scipy.sparse matrix of the Hamiltonian.

Raises:

• QiskitColdAtomError – If the type of the generator is not a FermionicOp.

• QiskitColdAtomError – If the fermion operator does not match the expected shape.