openfermion.utils.map_particle_hole_dm_to_two_pdm

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

View aliases

Main aliases

openfermion.map_particle_hole_dm_to_two_pdm, openfermion.utils.rdm_mapping_functions.map_particle_hole_dm_to_two_pdm

openfermion.utils.map_particle_hole_dm_to_two_pdm(
    phdm, opdm
)

Args
`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] == \(a_{p}^{\dagger}a_{q}\).

Args

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] == \(a_{p}^{\dagger}a_{q}\).

Returns
`tpdm`	`numpy.ndarray` The 2-RDM matrix.

Returns

tpdm

numpy.ndarray

The 2-RDM matrix.

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Last updated 2025-06-06 UTC.