openfermion.linalg.valdemoro_reconstruction

Build a 3-RDM by cumulant expansion and setting 3rd cumulant to zero

Main aliases

openfermion.linalg.valdemoro_reconstruction(
    tpdm, n_electrons
)

d3 approx = D ^ D ^ D + 3 (2C) ^ D

tpdm has normalization (n choose 2) where n is the number of electrons

Args
`tpdm`	`np.ndarray` four-tensor representing the two-RDM
`n_electrons`	`int` number of electrons in the system

Args

tpdm

np.ndarray

four-tensor representing the two-RDM

n_electrons

int

number of electrons in the system

Returns
six-tensor reprsenting the three-RDM

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Last updated 2025-06-06 UTC.