openfermion.utils.map_two_hole_dm_to_one_hole_dm

Map from 2-hole-RDM to 1-hole-RDM

Main aliases

openfermion.utils.map_two_hole_dm_to_one_hole_dm(
    tqdm, hole_number
)

Args
`tqdm`	`numpy.ndarray` The 2-hole-RDM as a 4-index tensor. Indices follow the internal convention of tqdm[p, q, r, s] == \(a_{p}a_{q}a_{r}^{\dagger}a_{s}^{\dagger}\).
`hole_number`	`float` Number of holes in the system. For chemical systems this is usually the number of spin orbitals minus the number of electrons.

Args

tqdm

numpy.ndarray

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

hole_number

float

Number of holes in the system. For chemical systems this is usually the number of spin orbitals minus the number of electrons.

Returns
`oqdm`	`numpy.ndarray` The 1-hole-RDM contracted from the tqdm.

oqdm

numpy.ndarray

The 1-hole-RDM contracted from the tqdm.

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Last updated 2025-06-06 UTC.