Fermion

Functions for the study of fermionic systems.

Functions

template<class BitstringVectorType>
auto Qiskit::addon::sqd::bitstrings_to_ci_strings_symmetrize_spin(const BitstringVectorType &bitstrings, std::optional<unsigned int> max_dimension = std::nullopt, std::optional<std::reference_wrapper<const std::vector<internal::HalfSize<typename BitstringVectorType::value_type>>>> include_configurations = std::nullopt) -> std::vector<internal::HalfSize<typename BitstringVectorType::value_type>>

Convert bitstrings into CI strings (representations of determinants).

This function separates each bitstring in bitstring_matrix in half, combining the right and left halves of all the bitstrings into a single set of unique configurations.

Parameters:

  • bitstrings – [in] Population of bitstrings.

  • max_dimension – [in] Maximum dimension of returned CI strings. If less than the number of CI strings, the list of CI strings will be truncated.

  • include_configurations – [in] A list of CI strings that will be included in the output, regardless of whether they are contained in bitstrings.

Template Parameters:

BitstringVectorType – Type of bitstrings, compatible with std::vector<boost::dynamic_bitset<>>.