def test_invalid_qubit_state_unitary(self, analytic, shots):
"""Test that an exception is raised if the
unitary matrix is the wrong size"""
dev = SimulatorDevice(2, analytic=analytic, shots=shots)
state = np.array([[0, 123.432], [-0.432, 023.4]])
with pytest.raises(ValueError, match=r"Not a unitary matrix"):
with mimic_execution_for_apply(dev):
dev.apply([qml.QubitUnitary(state, wires=[0, 1])])
def test_qubit_state_vector(self, init_state, analytic, shots, tol):
"""Test PauliX application"""
dev = SimulatorDevice(1, analytic=analytic, shots=shots)
state = init_state(1)
with mimic_execution_for_apply(dev):
dev.apply([qml.QubitStateVector(state, wires=[0])])
res = dev._state
expected = state
assert np.allclose(res, expected, **tol)
def test_basis_state(self, analytic, shots, tol):
"""Test basis state initialization"""
dev = SimulatorDevice(4, analytic=analytic, shots=shots)
state = np.array([0, 0, 1, 0])
with mimic_execution_for_apply(dev):
dev.apply([qml.BasisState(state, wires=[0, 1, 2, 3])])
res = dev._state
expected = np.zeros([2**4])
expected[np.ravel_multi_index(state, [2] * 4)] = 1
assert np.allclose(res, expected, **tol)
def test_invalid_qubit_state_vector(self, analytic, shots):
"""Test that an exception is raised if the state
vector is the wrong size"""
dev = SimulatorDevice(2, analytic=analytic, shots=shots)
state = np.array([0, 123.432])
with pytest.raises(
qml.DeviceError,
match=
r"For QubitStateVector, the state has to be specified for the correct number of qubits",
):
with mimic_execution_for_apply(dev):
dev.apply([qml.QubitStateVector(state, wires=[0, 1])])
def test_qubit_state_vector_on_wires_subset(self, init_state, device_wires,
op_wires, shots, tol):
"""Test QubitStateVector application on a subset of device wires"""
dev = SimulatorDevice(device_wires, shots=shots)
state = init_state(len(op_wires))
with mimic_execution_for_apply(dev):
dev.apply([qml.QubitStateVector(state, wires=op_wires)])
res = dev.state
expected = dev._expand_state(state, op_wires)
assert np.allclose(res, expected, **tol)
def test_three_qubit_no_parameters(self, init_state, analytic, shots, name,
mat, tol):
dev = SimulatorDevice(3, analytic=analytic, shots=shots)
state = init_state(3)
with mimic_execution_for_apply(dev):
dev.apply([
qml.QubitStateVector(state, wires=[0, 1, 2]),
qml.__getattribute__(name)(wires=[0, 1, 2]),
])
res = dev._state
expected = mat @ state
assert np.allclose(res, expected, **tol)
def test_qubit_unitary(self, init_state, analytic, shots, mat, tol):
N = int(np.log2(len(mat)))
dev = SimulatorDevice(N, analytic=analytic, shots=shots)
state = init_state(N)
with mimic_execution_for_apply(dev):
dev.apply([
qml.QubitStateVector(state, wires=list(range(N))),
qml.QubitUnitary(mat, wires=list(range(N))),
])
res = dev._state
expected = mat @ state
assert np.allclose(res, expected, **tol)
def test_two_qubit_no_parameters(self, init_state, shots, name, mat, tol):
"""Test PauliX application"""
dev = SimulatorDevice(2, shots=shots)
state = init_state(2)
with mimic_execution_for_apply(dev):
dev.apply([
qml.QubitStateVector(state, wires=[0, 1]),
qml.__getattribute__(name)(wires=[0, 1]),
])
res = dev._state
expected = mat @ state
assert np.allclose(res, expected, **tol)
def test_apply_cphase(self, tol, par, input, shots):
"""Tests that applying the CPhase gate yields the expected output."""
device = SimulatorDevice(2, shots=shots)
cphase_mat = np.array([[1, 0, 0, 0], [0, 1, 0, 0], [0, 0, 1, 0],
[0, 0, 0, np.exp(1j * par)]])
expected = cphase_mat @ input
device.reset()
device._initial_state = np.array(input, dtype=np.complex64)
device.apply([ops.CPhase(par, wires=[0, 1])])
assert np.allclose(device.state, expected, **tol)
def test_apply_iswap(self, tol, input, shots):
"""Tests that applying the iSWAP gate yields the expected output."""
device = SimulatorDevice(2, shots=shots)
iswap_mat = np.array([[1, 0, 0, 0], [0, 0, 1j, 0], [0, 1j, 0, 0],
[0, 0, 0, 1]])
expected = iswap_mat @ input
device.reset()
device._initial_state = np.array(input, dtype=np.complex64)
device.apply([ops.ISWAP(wires=[0, 1])])
assert np.allclose(device.state, expected, **tol)
def test_two_qubits_parameters(self, init_state, analytic, shots, name,
func, theta, tol):
"""Test application of two qubit gates with parameters"""
dev = SimulatorDevice(2, analytic=analytic, shots=shots)
state = init_state(2)
with mimic_execution_for_apply(dev):
dev.apply([
qml.QubitStateVector(state, wires=[0, 1]),
qml.__getattribute__(name)(theta, wires=[0, 1]),
])
res = dev._state
expected = func(theta) @ state
assert np.allclose(res, expected, **tol)
def test_single_qubit_no_parameters(self, init_state, analytic, shots,
name, mat, tol):
"""Test application of single qubit gates without parameters"""
dev = SimulatorDevice(1, analytic=analytic, shots=shots)
state = init_state(1)
with mimic_execution_for_apply(dev):
dev.apply([
qml.QubitStateVector(state, wires=[0]),
qml.__getattribute__(name)(wires=[0]),
])
res = dev._state
expected = mat @ state
assert np.allclose(res, expected, **tol)
def test_basis_state_on_wires_subset(self, state, device_wires, op_wires,
tol):
"""Test basis state initialization on a subset of device wires"""
dev = SimulatorDevice(device_wires)
with mimic_execution_for_apply(dev):
dev.apply([qml.BasisState(state, wires=op_wires)])
res = np.abs(dev.state)**2
# compute expected probabilities
expected = np.zeros([2**len(op_wires)])
expected[np.ravel_multi_index(state, [2] * len(op_wires))] = 1
expected = dev._expand_state(expected, op_wires)
assert np.allclose(res, expected, **tol)
def test_rotation(self, init_state, analytic, shots, tol):
"""Test three axis rotation gate"""
dev = SimulatorDevice(1, analytic=analytic, shots=shots)
state = init_state(1)
a = 0.542
b = 1.3432
c = -0.654
with mimic_execution_for_apply(dev):
dev.apply([
qml.QubitStateVector(state, wires=[0]),
qml.Rot(a, b, c, wires=[0])
])
res = dev._state
expected = rot(a, b, c) @ state
assert np.allclose(res, expected, **tol)