def test_majorana_form(self):
"""Test getting the Majorana form."""
majorana_matrix, majorana_constant = self.quad_ham_npc.majorana_form()
# Convert the Majorana form to a FermionOperator
majorana_op = FermionOperator((), majorana_constant)
for i in range(2 * self.n_qubits):
if i < self.n_qubits:
left_op = majorana_operator((i, 1))
else:
left_op = majorana_operator((i - self.n_qubits, 0))
for j in range(2 * self.n_qubits):
if j < self.n_qubits:
right_op = majorana_operator((j, 1), majorana_matrix[i, j])
else:
right_op = majorana_operator((j - self.n_qubits, 0),
majorana_matrix[i, j])
majorana_op += .5j * left_op * right_op
# Get FermionOperator for original Hamiltonian
fermion_operator = normal_ordered(
get_fermion_operator(self.quad_ham_npc))
self.assertTrue(normal_ordered(majorana_op).isclose(fermion_operator))
def test_bad_coefficient(self):
with self.assertRaises(ValueError):
majorana_op = majorana_operator((1, 1), 'a')
def test_bad_term(self):
with self.assertRaises(ValueError):
majorana_op = majorana_operator((2, 2))
with self.assertRaises(ValueError):
majorana_op = majorana_operator('a')
def test_none_term(self):
majorana_op = majorana_operator()
self.assertTrue(majorana_operator().isclose(FermionOperator()))