openfermion.linalg.jw_number_restrict_operator

Restrict a Jordan-Wigner encoded operator to a given particle number

openfermion.linalg.jw_number_restrict_operator(
    operator, n_electrons, n_qubits=None
)

sparse_operator ndarray or sparse

Numpy operator acting on the space of n_qubits.

n_electrons int

Number of particles to restrict the operator to

n_qubits int

Number of qubits defining the total state

new_operator ndarray or sparse

Numpy operator restricted to acting on states with the same particle number.