SupportsCommutators

class SupportsCommutators(*args, **kwargs)

Bases: Protocol

A Protocol indicating support for efficient commutator generation.

Implementation of this protocol requires the three methods below. See commutator(), anti_commutator(), and double_commutator() for the type-agnostic helper functions dispatching to these methods.

>>> from qiskit_fermions.operators import FermionOperator
>>> cre_0 = FermionOperator.from_dict({((True, 0),): 1.0})
>>> ann_0 = FermionOperator.from_dict({((False, 0),): 1.0})
>>> comm = FermionOperator._commutator_(cre_0, ann_0)
>>> print(format(comm.normal_ordered().simplify()))
 -1.000000e0 +0.000000e0j * ()
  2.000000e0 +0.000000e0j * (+0 -0)

Protocol Methods

_anti_commutator_

static _anti_commutator_(op_a, op_b)

Computes the anti-commutator of two operator instances.

See anti_commutator() for more details.

Parameters

op_a (T)
op_b (T)

Return type

_commutator_

static _commutator_(op_a, op_b)

Computes the commutator of two operator instances.

See commutator() for more details.

Parameters

op_a (T)
op_b (T)

Return type

_double_commutator_

static _double_commutator_(op_a, op_b, op_c, sign)

Computes the double-commutator of three operator instances.

See double_commutator() for more details.

Parameters

op_a (T)
op_b (T)
op_c (T)
sign (bool)

Return type