openfermion.utils.map_two_pdm_to_particle_hole_dm

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

Main aliases

openfermion.utils.map_two_pdm_to_particle_hole_dm(
    tpdm, opdm
)

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

tpdm

numpy.ndarray

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

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
`phdm`	`numpy.ndarray` The particle-hole matrix.

phdm

numpy.ndarray

The particle-hole matrix.

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Last updated 2025-06-06 UTC.