openfermion.utils.map_two_pdm_to_one_pdm

Contract a 2-RDM to a 1-RDM

Main aliases

openfermion.utils.map_two_pdm_to_one_pdm(
    tpdm, particle_number
)

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

Returns
opdm (numpy.ndarray): The 1-RDM contracted from the tpdm.

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Last updated 2021-10-20 UTC.

Args