def test_number_operator_nosite(self):
op = number_operator(4)
expected = (FermionOperator(((0, 1), (0, 0))) +
FermionOperator(((1, 1), (1, 0))) +
FermionOperator(((2, 1), (2, 0))) +
FermionOperator(((3, 1), (3, 0))))
self.assertTrue(op.isclose(expected))
def test_is_molecular_term_number(self):
op = number_operator(n_orbitals=5, orbital=3)
self.assertTrue(op.is_molecular_term())
def test_normal_ordered_number_reversed(self):
n_term_rev2 = FermionOperator(((2, 0), (2, 1)))
number_op2 = number_operator(3, 2)
expected = FermionOperator(()) - number_op2
self.assertTrue(normal_ordered(n_term_rev2).isclose(expected))
def test_number_operator_site(self):
op = number_operator(3, 2, 1j)
self.assertTrue(op.isclose(FermionOperator(((2, 1), (2, 0))) * 1j))
