to_chemist_ordering(two_body_tensor, *, index_order=None)[source]#

Convert a two-body tensor to chemists' index order.

Coverts the rank-four tensor two-body tensor representing two-body integrals from physicists', or intermediate, index order to chemists' index order: i,j,k,l -> i,l,j,k

  • two_body_tensor (ndarray | SparseArray) -- the rank-four tensor to be converted.

  • index_order (IndexType | None) -- when supplied this will hard-code the IndexType value. If None (the default), the index_order will be determined automatically based on the symmetries of the two_body_tensor.


The same rank-four tensor, now in chemists' index order.


QiskitNatureError -- when an unknown index type is encountered.

রিটার্ন টাইপ:

ndarray | SparseArray