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Map from 2-hole-RDM to 1-hole-RDM
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] ==
:math: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. |