|View source on GitHub|
Return a normal ordered FermionOperator or BosonOperator corresponding
openfermion.transforms.normal_ordered_ladder_term( term, coefficient, parity=-1 )
to single term.
|term (list or tuple): A sequence of tuples. The first element of each tuple is an integer indicating the mode on which a fermion ladder operator acts, starting from zero. The second element of each tuple is an integer, either 1 or 0, indicating whether creation or annihilation acts on that mode. coefficient(complex or float): The coefficient of the term. parity (int): parity=-1 corresponds to a Fermionic term that should be ordered based on the canonical anti-commutation relations. parity=1 corresponds to a Bosonic term that should be ordered based on the canonical commutation relations.|
||a FermionOperator or BosonOperator instance. The normal ordered form of the input. Note that this might have more terms.|
In our convention, normal ordering implies terms are ordered from highest tensor factor (on left) to lowest (on right). Also, ladder operators come first.
|Even assuming that each creation or annihilation operator appears at most a constant number of times in the original term, the runtime of this method is exponential in the number of qubits.|