def test_expval(self):
dev = ProjectQIBMBackend(wires=2,
use_hardware=False,
num_runs=8 * 1024,
user='******',
password='******',
verbose=True)
dev._eng = MagicMock()
dev._eng.backend = MagicMock()
dev._eng.backend.get_probabilities = MagicMock()
dev._eng.backend.get_probabilities.return_value = {
'00': 0.1,
'01': 0.3,
'10': 0.2,
'11': 0.4
}
self.assertAlmostEqual(dev.expval('PauliZ', wires=[0], par=list()),
-0.2,
delta=self.tol)
self.assertAlmostEqual(dev.expval('Identity', wires=[0], par=list()),
1.0,
delta=self.tol)
self.assertRaises(NotImplementedError,
dev.expval,
'Hermitian',
wires=[0],
par=list())
def test_expval_exception_if_no_expval_queue(self):
if self.args.device == 'ibm' or self.args.device == 'all':
dev = ProjectQIBMBackend(wires=2,
shots=1,
use_hardware=False,
user='******',
password='******',
verbose=True)
else:
return
del dev.__dict__['_expval_queue']
dev._eng = MagicMock()
dev._eng.backend = MagicMock()
dev._eng.backend.get_probabilities = MagicMock()
dev._eng.backend.get_probabilities.return_value = {'00': 1.0}
self.assertRaises(DeviceError,
dev.expval,
'PauliX',
wires=[0],
par=list())
self.assertRaises(DeviceError,
dev.expval,
'PauliY',
wires=[0],
par=list())
self.assertRaises(DeviceError,
dev.expval,
'Hadamard',
wires=[0],
par=list())
def test_pre_expval(self):
with patch('pennylane_pq.devices.ProjectQIBMBackend.expval_queue',
new_callable=PropertyMock) as mock_expval_queue:
mock_PauliX = MagicMock(wires=[0])
mock_PauliX.name = 'PauliX'
mock_PauliY = MagicMock(wires=[0])
mock_PauliY.name = 'PauliY'
mock_Hadamard = MagicMock(wires=[0])
mock_Hadamard.name = 'Hadamard'
mock_Hermitian = MagicMock(wires=[0])
mock_Hermitian.name = 'Hermitian'
mock_expval_queue.return_value = [
mock_PauliX,
mock_PauliY,
mock_Hadamard,
]
dev = ProjectQIBMBackend(wires=2,
use_hardware=False,
num_runs=8 * 1024,
user='******',
password='******',
verbose=True)
dev._eng = MagicMock()
dev.apply = MagicMock()
with patch('projectq.ops.All',
new_callable=PropertyMock) as mock_All:
dev.pre_expval()
dev._eng.assert_has_calls([call.flush()])
# The following might have to be changed in case a more elegant/efficient/different
# implementation of the effective measurements is found
dev.apply.assert_has_calls([
call('Hadamard', [0], []),
call('PauliZ', [0], []),
call('S', [0], []),
call('Hadamard', [0], []),
call('RY', [0], [-0.7853981633974483])
])
mock_expval_queue.return_value = [mock_Hermitian]
with patch('projectq.ops.All',
new_callable=PropertyMock) as mock_All:
self.assertRaises(NotImplementedError, dev.pre_expval)