def test_qubit_unitary(self, shots, qvm, compiler):
"""Test that an arbitrary unitary operation works"""
dev1 = qml.device('forest.qvm', device='3q-qvm', shots=shots)
dev2 = qml.device('forest.qvm', device='9q-square-qvm', shots=shots)
def circuit():
"""Reference QNode"""
qml.Hadamard(wires=0)
qml.CNOT(wires=[0, 1])
qml.QubitUnitary(U2, wires=[0, 1])
return qml.expval.PauliZ(0)
circuit1 = qml.QNode(circuit, dev1)
circuit2 = qml.QNode(circuit, dev2)
out_state = U2 @ np.array([1, 0, 0, 1])/np.sqrt(2)
obs = np.kron(np.array([[1, 0], [0, -1]]), I)
self.assertAllAlmostEqual(circuit1(), np.vdot(out_state, obs @ out_state), delta=3/np.sqrt(shots))
self.assertAllAlmostEqual(circuit2(), np.vdot(out_state, obs @ out_state), delta=3/np.sqrt(shots))
def test_identity_expectation(self, shots, qvm, compiler):
"""Test that identity expectation value (i.e. the trace) is 1"""
theta = 0.432
phi = 0.123
dev = plf.QVMDevice(device='2q-qvm', shots=shots)
dev.apply('RX', wires=[0], par=[theta])
dev.apply('RX', wires=[1], par=[phi])
dev.apply('CNOT', wires=[0, 1], par=[])
O = qml.expval.qubit.Identity
name = 'Identity'
dev._expval_queue = [O(wires=[0], do_queue=False), O(wires=[1], do_queue=False)]
res = dev.pre_expval()
res = np.array([dev.expval(name, [0], []), dev.expval(name, [1], [])])
# below are the analytic expectation values for this circuit (trace should always be 1)
self.assertAllAlmostEqual(res, np.array([1, 1]), delta=3/np.sqrt(shots))
def test_hadamard_expectation(self, shots, qvm, compiler):
"""Test that Hadamard expectation value is correct"""
theta = 0.432
phi = 0.123
dev = plf.QVMDevice(device='2q-qvm', shots=shots)
dev.apply('RY', wires=[0], par=[theta])
dev.apply('RY', wires=[1], par=[phi])
dev.apply('CNOT', wires=[0, 1], par=[])
O = qml.expval.Hadamard
name = 'Hadamard'
dev._expval_queue = [O(wires=[0], do_queue=False), O(wires=[1], do_queue=False)]
dev.pre_expval()
res = np.array([dev.expval(name, [0], []), dev.expval(name, [1], [])])
# below are the analytic expectation values for this circuit
expected = np.array([np.sin(theta)*np.sin(phi)+np.cos(theta), np.cos(theta)*np.cos(phi)+np.sin(phi)])/np.sqrt(2)
self.assertAllAlmostEqual(res, expected, delta=3/np.sqrt(shots))
def test_marginal_probability(self, tol):
"""Test that a coherent state marginal probability is correct"""
cutoff = 10
dev = qml.device("strawberryfields.fock", wires=2, cutoff_dim=cutoff)
@qml.qnode(dev)
def circuit(a, phi):
qml.Displacement(a, phi, wires=1)
return qml.probs(wires=1)
a = 0.4
phi = -0.12
alpha = a * np.exp(1j * phi)
n = np.arange(cutoff)
ref_probs = np.abs(
np.exp(-0.5 * np.abs(alpha)**2) * alpha**n / np.sqrt(fac(n)))**2
res = circuit(a, phi)
assert np.allclose(res, ref_probs, atol=tol, rtol=0)
def test_hermitian_expectation(self, shots, qvm, compiler):
"""Test that arbitrary Hermitian expectation values are correct.
As the results coming from the qvm are stochastic, a constraint of 3 out of 5 runs was added.
"""
theta = 0.432
phi = 0.123
dev = plf.QVMDevice(device="2q-qvm", shots=shots)
O1 = qml.expval(qml.Hermitian(H, wires=[0]))
O2 = qml.expval(qml.Hermitian(H, wires=[1]))
circuit_graph = CircuitGraph(
[
qml.RY(theta, wires=[0]),
qml.RY(phi, wires=[1]),
qml.CNOT(wires=[0, 1])
] + [O1, O2],
{},
)
dev.apply(circuit_graph.operations,
rotations=circuit_graph.diagonalizing_gates)
dev._samples = dev.generate_samples()
res = np.array([dev.expval(O1), dev.expval(O2)])
# below are the analytic expectation values for this circuit with arbitrary
# Hermitian observable H
a = H[0, 0]
re_b = H[0, 1].real
d = H[1, 1]
ev1 = ((a - d) * np.cos(theta) +
2 * re_b * np.sin(theta) * np.sin(phi) + a + d) / 2
ev2 = ((a - d) * np.cos(theta) * np.cos(phi) + 2 * re_b * np.sin(phi) +
a + d) / 2
expected = np.array([ev1, ev2])
self.assertAllAlmostEqual(res, expected, delta=4 / np.sqrt(shots))
def get_angles(x):
"""Compute rotation angles for state preparation routine.
Args:
x: original input vector
Returns:
array[float]: feature vector of angles
"""
beta0 = 2 * np.arcsin(np.sqrt(x[1]) ** 2 / np.sqrt(x[0] ** 2 + x[1] ** 2 + 1e-12) )
beta1 = 2 * np.arcsin(np.sqrt(x[3]) ** 2 / np.sqrt(x[2] ** 2 + x[3] ** 2 + 1e-12) )
beta2 = 2 * np.arcsin(np.sqrt(x[2] ** 2 + x[3] ** 2) / np.sqrt(x[0] ** 2 + x[1] ** 2 + x[2] ** 2 + x[3] ** 2))
return np.array([beta2, -beta1 / 2, beta1 / 2, -beta0 / 2, beta0 / 2])
def QNNLayer(self, params):
'''
Definition of a single ST step for
layering QNN
'''
ExcInts = params[0:3]
ExtField = params[3:6]
# Parameters for external
# field evol
Hx = ExtField[0]
Hy = ExtField[1]
Hz = ExtField[2]
H = np.sqrt(Hx**2 + Hy**2 + Hz**2)
# Parameter values for Qiskit
PHI = np.arctan2(Hy, Hx) + 2*np.pi
THETA = np.arccos(Hz/H)
LAMBDA = np.pi
# Cascade Spin pair interaction
for idx in range(self.num_spins-1):
# Convert to computational basis
qml.CNOT(wires=[idx, idx+1])
qml.Hadamard(wires=idx)
# Compute J3 phase
qml.RZ(ExcInts[2], wires=idx+1)
# Compute J1 phase
qml.RZ(ExcInts[0], wires=idx)
# Compute J2 Phase
qml.CNOT(wires=[idx, idx+1])
qml.RZ(-ExcInts[1], wires=idx+1)
qml.CNOT(wires=[idx, idx+1])
# Return to computational basis
qml.Hadamard(wires=idx)
qml.CNOT(wires=[idx, idx+1])
# Include external field
qml.U3(-THETA, -LAMBDA, -PHI, wires=idx)
qml.RZ(H, wires=idx)
qml.U3(THETA, PHI, LAMBDA, wires=idx)
# Include external field for last spin
qml.U3(-THETA, -LAMBDA, -PHI, wires=self.num_spins-1)
qml.RZ(H, wires=self.num_spins-1)
qml.U3(THETA, PHI, LAMBDA, wires=self.num_spins-1)
def test_one_qubit_wavefunction_circuit(self, device, qvm, compiler):
"""Test that the wavefunction plugin provides correct result for simple circuit.
As the results coming from the qvm are stochastic, a constraint of 2 out of 5 runs was added.
"""
shots = 100_000
dev = qml.device("forest.qvm", device=device, shots=QVM_SHOTS)
a = 0.543
b = 0.123
c = 0.987
@qml.qnode(dev)
def circuit(x, y, z):
"""Reference QNode"""
qml.BasisState(np.array([1]), wires=0)
qml.Hadamard(wires=0)
qml.Rot(x, y, z, wires=0)
return qml.expval(qml.PauliZ(0))
self.assertAlmostEqual(circuit(a, b, c), np.cos(a) * np.sin(b), delta=3 / np.sqrt(shots))
def compute_K(generator):
"""Compute the K hyperparameter controlling # iterations of amplification.
Args:
generator: An initialized circuit generator (one of the ones above)
"""
np.random.seed(0)
N = 50
target_prob_list = [
generator.target_prob([
np.random.uniform(low=0, high=2 * np.pi)
for j in range(generator.num_qubits)
]) for _ in range(N)
]
cosphi_list = [2 * p - 1 for p in target_prob_list]
cosPhi, cosPhi_error = np.mean(
cosphi_list), np.std(cosphi_list) / np.sqrt(N)
Phi = np.arccos(cosPhi)
K = int(np.pi / (2 * (np.pi - Phi)))
return K
def test_var(self, shots):
"""Tests for variance calculation"""
dev = plf.QVMDevice(device="2q-qvm", shots=shots)
phi = 0.543
theta = 0.6543
# test correct variance for <Z> of a rotated state
dev.apply("RX", wires=[0], par=[phi])
dev.apply("RY", wires=[0], par=[theta])
O = qml.PauliZ
name = "PauliZ"
dev._obs_queue = [O(wires=[0], do_queue=False)]
dev.pre_measure()
var = dev.var(name, [0], [])
expected = 0.25 * (3 - np.cos(2 * theta) - 2 * np.cos(theta) ** 2 * np.cos(2 * phi))
self.assertAlmostEqual(var, expected, delta=3 / np.sqrt(shots))
def test_displaced_squeezed_state(self):
"""Test the displaced squeezed state is correct."""
self.logTestName()
alpha = 0.541 + 0.109j
a = abs(alpha)
phi_a = np.angle(alpha)
r = 0.432
phi_r = 0.123
means, cov = displaced_squeezed_state(a, phi_a, r, phi_r, hbar=hbar)
# test vector of means is correct
self.assertAllAlmostEqual(means,
np.array([alpha.real, alpha.imag]) *
np.sqrt(2 * hbar),
delta=self.tol)
R = rotation(phi_r / 2)
expected = R @ np.array([[np.exp(-2 * r), 0], [0, np.exp(2 * r)]
]) * hbar / 2 @ R.T
# test covariance matrix is correct
self.assertAllAlmostEqual(cov, expected, delta=self.tol)
def test_multi_mode_probability(self, tol):
"""Test that a product of coherent states returns the correct probability"""
dev = qml.device("strawberryfields.gaussian", wires=2)
@qml.qnode(dev)
def circuit(a, phi):
qml.Displacement(a, phi, wires=0)
qml.Displacement(a, phi, wires=1)
return qml.probs(wires=[0, 1])
a = 0.4
phi = -0.12
cutoff = 10
alpha = a * np.exp(1j * phi)
n = np.arange(cutoff)
ref_probs = np.abs(np.exp(-0.5 * np.abs(alpha) ** 2) * alpha**n / np.sqrt(fac(n))) ** 2
ref_probs = np.kron(ref_probs, ref_probs)
res = circuit(a, phi)
assert np.allclose(res, ref_probs, atol=tol, rtol=0)
def test_nonzero_shots(self):
"""Test that the fock plugin provides correct result for high shot number"""
shots = 10**2
dev = qml.device("strawberryfields.fock",
wires=1,
cutoff_dim=10,
shots=shots)
@qml.qnode(dev)
def circuit(x):
qml.Displacement(x, 0, wires=0)
return qml.expval(qml.NumberOperator(0))
x = 1
runs = []
for _ in range(100):
runs.append(circuit(x))
expected_var = np.sqrt(1 / shots)
assert np.allclose(np.mean(runs), x, atol=expected_var)
def test_apply_errors(self, qubit_device_2_wires):
"""Test that apply fails for incorrect state preparation, and > 2 qubit gates"""
with pytest.raises(
ValueError,
match=r"State vector must be of length 2\*\*wires."
):
p = [np.array([1, 0, 1, 1, 1]) / np.sqrt(3)]
qubit_device_2_wires.apply("QubitStateVector", wires=[0, 1], par=[p])
with pytest.raises(
ValueError,
match="BasisState parameter must be an array of 0 or 1 integers of length at most 2."
):
qubit_device_2_wires.apply("BasisState", wires=[0, 1], par=[np.array([-0.2, 4.2])])
with pytest.raises(
ValueError,
match="The default.qubit plugin can apply BasisState only to all of the 2 wires."
):
qubit_device_2_wires.apply("BasisState", wires=[0, 1, 2], par=[np.array([0, 1])])
def test_pauliy_expectation(self, shots, qvm, compiler):
"""Test that PauliY expectation value is correct"""
theta = 0.432
phi = 0.123
dev = plf.QVMDevice(device="2q-qvm", shots=shots)
dev.apply("RX", wires=[0], par=[theta])
dev.apply("RX", wires=[1], par=[phi])
dev.apply("CNOT", wires=[0, 1], par=[])
O = qml.PauliY
name = "PauliY"
dev._obs_queue = [O(wires=[0], do_queue=False), O(wires=[1], do_queue=False)]
dev.pre_measure()
# below are the analytic expectation values for this circuit
res = np.array([dev.expval(name, [0], []), dev.expval(name, [1], [])])
self.assertAllAlmostEqual(
res, np.array([0, -np.cos(theta) * np.sin(phi)]), delta=3 / np.sqrt(shots)
)
def test_apply_errors(self):
"""Test that apply fails for incorrect state preparation, and > 2 qubit gates"""
self.logTestName()
with self.assertRaisesRegex(
ValueError, r"State vector must be of length 2\*\*wires."
):
p = [np.array([1, 0, 1, 1, 1]) / np.sqrt(3)]
self.dev.apply("QubitStateVector", wires=[0, 1], par=[p])
with self.assertRaisesRegex(
ValueError,
"BasisState parameter must be an array of 0 or 1 integers of length at most 2.",
):
self.dev.apply("BasisState", wires=[0, 1], par=[np.array([-0.2, 4.2])])
with self.assertRaisesRegex(
ValueError,
"The default.qubit plugin can apply BasisState only to all of the 2 wires.",
):
self.dev.apply("BasisState", wires=[0, 1, 2], par=[np.array([0, 1])])
def test_pauliz_hadamard(self, device, tol, skip_if):
"""Test that a tensor product involving PauliZ and PauliY and hadamard works correctly"""
n_wires = 3
dev = device(n_wires)
if dev.shots is None:
pytest.skip("Device is in analytic mode, cannot test sampling.")
skip_if(dev, {"supports_tensor_observables": False})
theta = 0.432
phi = 0.123
varphi = -0.543
@qml.qnode(dev)
def circuit():
qml.RX(theta, wires=[0])
qml.RX(phi, wires=[1])
qml.RX(varphi, wires=[2])
qml.CNOT(wires=[0, 1])
qml.CNOT(wires=[1, 2])
return qml.sample(
qml.PauliZ(wires=[0]) @ qml.Hadamard(wires=[1])
@ qml.PauliY(wires=[2]))
res = circuit()
# s1 should only contain 1 and -1
assert np.allclose(res**2, 1, atol=tol(False))
mean = np.mean(res)
expected = -(np.cos(varphi) * np.sin(phi) +
np.sin(varphi) * np.cos(theta)) / np.sqrt(2)
assert np.allclose(mean, expected, atol=tol(False))
var = np.var(res)
expected = (3 + np.cos(2 * phi) * np.cos(varphi)**2 -
np.cos(2 * theta) * np.sin(varphi)**2 -
2 * np.cos(theta) * np.sin(phi) * np.sin(2 * varphi)) / 4
assert np.allclose(var, expected, atol=tol(False))
def test_hadamard_expectation(self, device, tol):
"""Test that Hadamard expectation value is correct"""
n_wires = 2
dev = device(n_wires)
theta = 0.432
phi = 0.123
@qml.qnode(dev)
def circuit():
qml.RY(theta, wires=[0])
qml.RY(phi, wires=[1])
qml.CNOT(wires=[0, 1])
return qml.expval(qml.Hadamard(wires=0)), qml.expval(
qml.Hadamard(wires=1))
res = circuit()
expected = np.array([
np.sin(theta) * np.sin(phi) + np.cos(theta),
np.cos(theta) * np.cos(phi) + np.sin(phi)
]) / np.sqrt(2)
assert np.allclose(res, expected, atol=tol(dev.shots))
def test_nonzero_shots(self):
"""Test that the default gaussian plugin provides correct result for high shot number"""
self.logTestName()
shots = 10**4
dev = qml.device('default.gaussian', wires=1, shots=shots)
p = 0.543
@qml.qnode(dev)
def circuit(x):
"""Test quantum function"""
qml.Displacement(x, 0, wires=0)
return qml.expval(qml.X(0))
runs = []
for _ in range(100):
runs.append(circuit(p))
self.assertAlmostEqual(np.mean(runs),
p * np.sqrt(2 * hbar),
delta=0.01)
def test_identity_expectation(self, shots, qvm, compiler):
"""Test that identity expectation value (i.e. the trace) is 1"""
theta = 0.432
phi = 0.123
dev = plf.QVMDevice(device="2q-qvm", shots=shots)
O1 = qml.expval(qml.Identity(wires=[0]))
O2 = qml.expval(qml.Identity(wires=[1]))
circuit_graph = CircuitGraph(
[qml.RX(theta, wires=[0]), qml.RX(phi, wires=[1]), qml.CNOT(wires=[0, 1])], [O1, O2], dev.wires
)
dev.apply(circuit_graph.operations, rotations=circuit_graph.diagonalizing_gates)
dev._samples = dev.generate_samples()
res = np.array([dev.expval(O1), dev.expval(O2)])
# below are the analytic expectation values for this circuit (trace should always be 1)
self.assertAllAlmostEqual(res, np.array([1, 1]), delta=3 / np.sqrt(shots))
def test_analysis_caching(self, mocker):
"""Test that the gradient analysis is only executed once per tape"""
psi = np.array([1, 0, 1, 0]) / np.sqrt(2)
with qml.tape.JacobianTape() as tape:
qml.QubitStateVector(psi, wires=[0, 1])
qml.RX(0.543, wires=[0])
qml.RY(-0.654, wires=[1])
qml.CNOT(wires=[0, 1])
qml.probs(wires=[0, 1])
spy = mocker.spy(tape, "_grad_method")
_gradient_analysis(tape)
spy.assert_called()
assert tape._par_info[0]["grad_method"] is None
assert tape._par_info[1]["grad_method"] == "A"
assert tape._par_info[2]["grad_method"] == "A"
spy = mocker.spy(tape, "_grad_method")
_gradient_analysis(tape)
spy.assert_not_called()
def load():
data = np.loadtxt("data/iris_classes1and2_scaled.txt")
X = data[:, 0:2]
print("First X sample (original) :", X[0])
# pad the vectors to size 2^2 with constant values
padding = 0.3 * np.ones((len(X), 1))
X_pad = np.c_[np.c_[X, padding], np.zeros((len(X), 1))]
print("First X sample (padded) :", X_pad[0])
# normalize each input
normalization = np.sqrt(np.sum(X_pad**2, -1))
X_norm = (X_pad.T / normalization).T
print("First X sample (normalized):", X_norm[0])
# angles for state preparation are new features
features = np.array([get_angles(x) for x in X_norm])
print("First features sample :", features[0])
Y = data[:, -1]
return (X, X_norm, features, Y)
def test_pauliz_hadamard(self, device, shots, tol):
"""Test that a tensor product involving PauliZ and PauliY and Hadamard works correctly"""
dev = device(3)
theta = 0.432
phi = 0.123
varphi = -0.543
@qml.qnode(dev)
def circuit():
qml.RX(theta, wires=[0])
qml.RX(phi, wires=[1])
qml.RX(varphi, wires=[2])
qml.CNOT(wires=[0, 1])
qml.CNOT(wires=[1, 2])
return qml.expval(
qml.PauliZ(wires=[0]) @ qml.Hadamard(wires=[1])
@ qml.PauliY(wires=[2]))
expected = -(np.cos(varphi) * np.sin(phi) +
np.sin(varphi) * np.cos(theta)) / np.sqrt(2)
assert np.allclose(circuit(), expected, **tol)
def test_multi_mode_hermitian_expectation(self, shots, qvm, compiler):
"""Test that arbitrary multi-mode Hermitian expectation values are correct"""
theta = 0.432
phi = 0.123
dev = plf.QVMDevice(device="2q-qvm", shots=10 * shots)
dev.apply("RY", wires=[0], par=[theta])
dev.apply("RY", wires=[1], par=[phi])
dev.apply("CNOT", wires=[0, 1], par=[])
O = qml.Hermitian
name = "Hermitian"
A = np.array(
[
[-6, 2 + 1j, -3, -5 + 2j],
[2 - 1j, 0, 2 - 1j, -5 + 4j],
[-3, 2 + 1j, 0, -4 + 3j],
[-5 - 2j, -5 - 4j, -4 - 3j, -6],
]
)
dev._obs_queue = [O(A, wires=[0, 1], do_queue=False)]
dev.pre_measure()
res = np.array([dev.expval(name, [0, 1], [A])])
# below is the analytic expectation value for this circuit with arbitrary
# Hermitian observable A
expected = 0.5 * (
6 * np.cos(theta) * np.sin(phi)
- np.sin(theta) * (8 * np.sin(phi) + 7 * np.cos(phi) + 3)
- 2 * np.sin(phi)
- 6 * np.cos(phi)
- 6
)
self.assertAllAlmostEqual(res, expected, delta=4 / np.sqrt(shots))
def test_nonzero_shots(self, qvm, compiler):
"""Test that the wavefunction plugin provides correct result for high shot number"""
shots = 10**2
dev = qml.device('forest.wavefunction', wires=1, shots=shots)
a = 0.543
b = 0.123
c = 0.987
@qml.qnode(dev)
def circuit(x, y, z):
"""Test QNode"""
qml.BasisState(np.array([1]), wires=0)
qml.Hadamard(wires=0)
qml.Rot(x, y, z, wires=0)
return qml.expval.PauliZ(0)
runs = []
for _ in range(100):
runs.append(circuit(a, b, c))
expected_var = np.sqrt(1/shots)
self.assertAlmostEqual(np.mean(runs), np.cos(a)*np.sin(b), delta=expected_var)
def test_ev(self, ev, tol):
"""Test that expectation values are calculated correctly"""
dev = plf.NumpyWavefunctionDevice(wires=2)
# start in the following initial state
dev.state = np.array([1, 0, 1, 1]) / np.sqrt(3)
dev.active_wires = {0, 1}
# get the equivalent pennylane operation class
op = getattr(qml.ops, ev)
O = test_operation_map[ev]
# calculate the expected output
if op.num_wires == 1 or op.num_wires == 0:
expected_out = dev.state.conj() @ np.kron(O, I) @ dev.state
elif op.num_wires == 2:
expected_out = dev.state.conj() @ O @ dev.state
res = dev.ev(O, wires=[0])
# verify the device is now in the expected state
self.assertAllAlmostEqual(res, expected_out, delta=tol)
def test_correct_state(self, tol):
"""Test that the device state is correct after applying a
quantum function on the device"""
dev = qml.device("default.qubit.autograd", wires=2)
state = dev.state
expected = np.array([1, 0, 0, 0])
assert np.allclose(state, expected, atol=tol, rtol=0)
@qml.qnode(dev, interface="autograd", diff_method="backprop")
def circuit():
qml.Hadamard(wires=0)
qml.RZ(np.pi / 4, wires=0)
return qml.expval(qml.PauliZ(0))
circuit()
state = dev.state
amplitude = np.exp(-1j * np.pi / 8) / np.sqrt(2)
expected = np.array([amplitude, 0, np.conj(amplitude), 0])
assert np.allclose(state, expected, atol=tol, rtol=0)
def test_nonzero_shots(self):
"""Test that the fock plugin provides correct result for high shot number"""
self.logTestName()
shots = 10**2
dev = qml.device('strawberryfields.fock',
wires=1,
cutoff_dim=10,
shots=shots)
@qml.qnode(dev)
def circuit(x):
qml.Displacement(x, 0, wires=0)
return qml.expval.MeanPhoton(0)
x = 1
runs = []
for _ in range(100):
runs.append(circuit(x))
expected_var = np.sqrt(1 / shots)
self.assertAlmostEqual(np.mean(runs), x, delta=expected_var)
def circle(samples, center=[0.0, 0.0], radius=np.sqrt(2 / np.pi)):
"""
Generates a dataset of points with 1/0 labels inside a given radius.
Args:
samples (int): number of samples to generate
center (tuple): center of the circle
radius (float: radius of the circle
Returns:
Xvals (array[tuple]): coordinates of points
Xvals (array[int]): classification labels
"""
Xvals, yvals = [], []
for i in range(samples):
x = 2 * (np.random.rand(2)) - 1
y = 0
if np.linalg.norm(x - center) < radius:
y = 1
Xvals.append(x)
yvals.append(y)
return np.array(Xvals), np.array(yvals)
def test_paulix_expectation(self, shots):
"""Test that PauliX expectation value is correct"""
theta = 0.432
phi = 0.123
dev = plf.QVMDevice(device="2q-pyqvm", shots=shots)
O1 = qml.expval(qml.PauliX(wires=[0]))
O2 = qml.expval(qml.PauliX(wires=[1]))
circuit_graph = CircuitGraph(
[qml.RY(theta, wires=[0]), qml.RY(phi, wires=[1]), qml.CNOT(wires=[0, 1])] + [O1, O2],
{},
)
dev.apply(circuit_graph.operations, rotations=circuit_graph.diagonalizing_gates)
dev._samples = dev.generate_samples()
res = np.array([dev.expval(O1), dev.expval(O2)])
# below are the analytic expectation values for this circuit
self.assertAllAlmostEqual(
res, np.array([np.sin(theta) * np.sin(phi), np.sin(phi)]), delta=3 / np.sqrt(shots)
)
