def test_get_interaction_operator_one_body(self):
interaction_operator = get_interaction_operator(
FermionOperator('2^ 2'), self.n_qubits)
one_body = numpy.zeros((self.n_qubits, self.n_qubits), float)
one_body[2, 2] = 1.
self.assertEqual(interaction_operator,
InteractionOperator(0.0, one_body, self.two_body))
def setUp(self):
self.n_qubits = 5
self.fermion_term = FermionOperator('1^ 2^ 3 4', -3.17)
self.fermion_operator = self.fermion_term + hermitian_conjugated(
self.fermion_term)
self.qubit_operator = jordan_wigner(self.fermion_operator)
self.interaction_operator = get_interaction_operator(
self.fermion_operator)
def test_get_interaction_operator_two_body_distinct(self):
interaction_operator = get_interaction_operator(
FermionOperator('0^ 1^ 2 3'), self.n_qubits)
two_body = numpy.zeros(
(self.n_qubits, self.n_qubits, self.n_qubits, self.n_qubits),
float)
two_body[1, 0, 3, 2] = 1.
self.assertEqual(interaction_operator,
InteractionOperator(0.0, self.one_body, two_body))
def test_get_interaction_operator_two_body(self):
interaction_operator = get_interaction_operator(
FermionOperator('2^ 2 3^ 4'), self.n_qubits)
two_body = numpy.zeros(
(self.n_qubits, self.n_qubits, self.n_qubits, self.n_qubits),
float)
two_body[3, 2, 4, 2] = -1.
self.assertEqual(interaction_operator,
InteractionOperator(0.0, self.one_body, two_body))
def test_get_interaction_operator_one_body_twoterm(self):
interaction_operator = get_interaction_operator(
FermionOperator('2^ 3', -2j) + FermionOperator('3^ 2', 3j),
self.n_qubits)
one_body = numpy.zeros((self.n_qubits, self.n_qubits), complex)
one_body[2, 3] = -2j
one_body[3, 2] = 3j
self.assertEqual(interaction_operator,
InteractionOperator(0.0, one_body, self.two_body))
def test_get_interaction_operator_identity(self):
interaction_operator = InteractionOperator(-2j, self.one_body,
self.two_body)
qubit_operator = jordan_wigner(interaction_operator)
self.assertTrue(qubit_operator.isclose(-2j * QubitOperator(())))
self.assertEqual(
interaction_operator,
get_interaction_operator(reverse_jordan_wigner(qubit_operator),
self.n_qubits))
def test_jordan_wigner_interaction_op_with_zero_term(self):
test_op = FermionOperator('1^ 2^ 3 4')
test_op += hermitian_conjugated(test_op)
interaction_op = get_interaction_operator(test_op)
interaction_op.constant = 0.0
retransformed_test_op = reverse_jordan_wigner(
jordan_wigner(interaction_op))
def test_jordan_wigner_twobody_interaction_op_allunique(self):
test_op = FermionOperator('1^ 2^ 3 4')
test_op += hermitian_conjugated(test_op)
retransformed_test_op = reverse_jordan_wigner(
jordan_wigner(get_interaction_operator(test_op)))
self.assertTrue(
normal_ordered(retransformed_test_op).isclose(
normal_ordered(test_op)))
def test_jordan_wigner_twobody_interaction_op_reversal_symmetric(self):
test_op = FermionOperator('1^ 2^ 2 1')
test_op += hermitian_conjugated(test_op)
self.assertTrue(
jordan_wigner(test_op).isclose(
jordan_wigner(get_interaction_operator(test_op))))
