to_chemist_ordering

to_chemist_ordering(two_body_tensor, *, index_order=None)

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

パラメータ:

• 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.

戻り値:

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

例外:

QiskitNatureError – when an unknown index type is encountered.

戻り値の型:

ndarray | SparseArray