qiskit.chemistry.FermionicOperator.fermion_mode_freezing¶
-
FermionicOperator.fermion_mode_freezing(fermion_mode_array)[source]¶ Freezing modes and extracting its energy.
Generate a fermionic operator with the modes in fermion_mode_array deleted and provide the shifted energy after freezing.
- Parameters
fermion_mode_array (list) – orbital index for freezing
- Returns
Fermionic Hamiltonian and energy of frozen modes
- Return type
tuple(FermionicOperator, float)