openfermion.utils.map_particle_hole_dm_to_two_pdm

Map the 2-RDM to the particle-hole-RDM

phdm numpy.ndarray

The 2-particle-hole-RDM as a 4-index tensor. Indices follow the internal convention of phdm[p, q, r, s] == \(a_{p}^{\dagger}a_{q}a_{r}^{\dagger}a_{s}\).

opdm numpy.ndarray

The 1-RDM as a 2-index tensor. Indices follow the internal convention of opdm[p, q] == \(a_{p}^{\dagger}a_{q}\).

tpdm numpy.ndarray

The 2-RDM matrix.