def test_invalid_qubit_state_unitary(self, analytic, shots):
"""Test that an exception is raised if the
unitary matrix is the wrong size"""
dev = MixedStateSimulatorDevice(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 = MixedStateSimulatorDevice(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
expected = np.kron(state, state.conj()).reshape([2, 2])
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 = MixedStateSimulatorDevice(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_identity_basis_state(self, analytic, shots, tol):
"""Test basis state initialization if identity"""
dev = MixedStateSimulatorDevice(4, analytic=analytic, shots=shots)
state = np.array([1, 0, 0, 0])
with mimic_execution_for_apply(dev):
dev.apply([qml.BasisState(state, wires=[0, 1, 2, 3])])
res = dev._state
expected = np.zeros([16])
expected[np.ravel_multi_index(state, [2] * 4)] = 1
expected = np.kron(expected, expected.conj()).reshape([16, 16])
assert np.allclose(res, expected, **tol)
def test_three_qubit_no_parameters(self, init_state, analytic, shots, name,
mat, tol):
dev = MixedStateSimulatorDevice(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
expected = np.kron(expected, expected.conj()).reshape([8, 8])
assert np.allclose(res, expected, **tol)
def test_qubit_unitary(self, init_state, analytic, shots, mat, tol):
N = int(np.log2(len(mat)))
dev = MixedStateSimulatorDevice(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
expected = np.kron(expected, expected.conj()).reshape([2**N, 2**N])
assert np.allclose(res, expected, **tol)
def test_two_qubit_no_parameters(self, init_state, shots, name, mat, tol):
"""Test PauliX application"""
dev = MixedStateSimulatorDevice(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
expected = np.kron(expected, expected.conj()).reshape([4, 4])
assert np.allclose(res, expected, **tol)
def test_two_qubits_parameters(self, init_state, analytic, shots, name,
func, theta, tol):
"""Test application of single qubit gates with parameters"""
dev = MixedStateSimulatorDevice(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
expected = np.kron(expected, expected.conj()).reshape([4, 4])
assert np.allclose(res, expected, **tol)
def test_rotation(self, init_state, analytic, shots, tol):
"""Test three axis rotation gate"""
dev = MixedStateSimulatorDevice(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
expected = np.kron(expected, expected.conj()).reshape([2, 2])
assert np.allclose(res, expected, **tol)