def fermion_generator(self) -> 'openfermion.FermionOperator':
"""The FermionOperator G such that the gate's unitary is exp(-i t G)
with exponent t using the Jordan-Wigner transformation."""
half_generator = sum(
(w * G
for w, G in zip(self.weights, self.fermion_generator_components())
), ops.FermionOperator())
return half_generator + hermitian_conjugated(half_generator)
def fermion_generator_components():
return (
ops.FermionOperator(((0, 1), (1, 0), (2, 0), (3, 1)), -1),
ops.FermionOperator(((0, 1), (1, 0), (2, 1), (3, 0))),
ops.FermionOperator(((0, 1), (1, 1), (2, 0), (3, 0)), -1),
)
def fermion_generator_components():
return (
ops.FermionOperator(((0, 1), (1, 0))),
ops.FermionOperator(((0, 1), (0, 0), (1, 1), (1, 0)), 0.5),
)