def test_parameter_binding_on_listop(self):
"""Test passing a ListOp with differing parameters works with the circuit sampler."""
try:
from qiskit.providers.aer import Aer
except Exception as ex: # pylint: disable=broad-except
self.skipTest(
"Aer doesn't appear to be installed. Error: '{}'".format(
str(ex)))
return
x, y = Parameter('x'), Parameter('y')
circuit1 = QuantumCircuit(1)
circuit1.p(0.2, 0)
circuit2 = QuantumCircuit(1)
circuit2.p(x, 0)
circuit3 = QuantumCircuit(1)
circuit3.p(y, 0)
bindings = {x: -0.4, y: 0.4}
listop = ListOp(
[StateFn(circuit) for circuit in [circuit1, circuit2, circuit3]])
sampler = CircuitSampler(Aer.get_backend('qasm_simulator'))
sampled = sampler.convert(listop, params=bindings)
self.assertTrue(all(len(op.parameters) == 0 for op in sampled.oplist))
def test_adjoint_nonunitary_circuit_raises(self):
"""Test adjoint on a non-unitary circuit raises a OpflowError instead of CircuitError."""
circuit = QuantumCircuit(1)
circuit.reset(0)
with self.assertRaises(OpflowError):
_ = StateFn(circuit).adjoint()
def _eval_aux_ops(
self,
parameters: np.ndarray,
aux_operators: List[OperatorBase],
expectation: ExpectationBase,
threshold: float = 1e-12,
) -> np.ndarray:
# Create new CircuitSampler to avoid breaking existing one's caches.
sampler = CircuitSampler(self.quantum_instance)
aux_op_meas = expectation.convert(
StateFn(ListOp(aux_operators), is_measurement=True))
aux_op_expect = aux_op_meas.compose(
CircuitStateFn(self.ansatz.bind_parameters(parameters)))
values = np.real(sampler.convert(aux_op_expect).eval())
# Discard values below threshold
aux_op_results = values * (np.abs(values) > threshold)
# Deal with the aux_op behavior where there can be Nones or Zero qubit Paulis in the list
_aux_op_nones = [op is None for op in aux_operators]
aux_operator_eigenvalues = [
None if is_none else [result]
for (is_none, result) in zip(_aux_op_nones, aux_op_results)
]
# As this has mixed types, since it can included None, it needs to explicitly pass object
# data type to avoid numpy 1.19 warning message about implicit conversion being deprecated
aux_operator_eigenvalues = np.array([aux_operator_eigenvalues],
dtype=object)
return aux_operator_eigenvalues
def test_state_gradient4(self, method):
"""Test the state gradient 4
Tr(|psi><psi|ZX) = -cos(a)
daTr(|psi><psi|ZX) = sin(a)
"""
ham = X ^ Z
a = Parameter('a')
params = a
q = QuantumRegister(2)
qc = QuantumCircuit(q)
qc.x(q[0])
qc.h(q[1])
qc.crz(a, q[0], q[1])
op = ~StateFn(ham) @ CircuitStateFn(primitive=qc, coeff=1.)
state_grad = Gradient(grad_method=method).convert(operator=op,
params=params)
values_dict = [{a: np.pi / 4}, {a: 0}, {a: np.pi / 2}]
correct_values = [1 / np.sqrt(2), 0, 1]
for i, value_dict in enumerate(values_dict):
np.testing.assert_array_almost_equal(
state_grad.assign_parameters(value_dict).eval(),
correct_values[i],
decimal=1)
def test_pauli_expectation_param_qobj(self):
""" Test PauliExpectation with param_qobj """
q_instance = QuantumInstance(self.backend,
seed_simulator=self.seed,
seed_transpiler=self.seed,
shots=10000)
qubit_op = (0.1 * I ^ I) + (0.2 * I ^ Z) + (0.3 * Z ^ I) + (
0.4 * Z ^ Z) + (0.5 * X ^ X)
var_form = RealAmplitudes(qubit_op.num_qubits)
ansatz_circuit_op = CircuitStateFn(var_form)
observable = PauliExpectation().convert(~StateFn(qubit_op))
expect_op = observable.compose(ansatz_circuit_op).reduce()
params1 = {}
params2 = {}
for param in var_form.parameters:
params1[param] = [0]
params2[param] = [0, 0]
sampler1 = CircuitSampler(backend=q_instance, param_qobj=False)
samples1 = sampler1.convert(expect_op, params=params1)
val1 = np.real(samples1.eval())[0]
samples2 = sampler1.convert(expect_op, params=params2)
val2 = np.real(samples2.eval())
sampler2 = CircuitSampler(backend=q_instance, param_qobj=True)
samples3 = sampler2.convert(expect_op, params=params1)
val3 = np.real(samples3.eval())
samples4 = sampler2.convert(expect_op, params=params2)
val4 = np.real(samples4.eval())
np.testing.assert_array_almost_equal([val1] * 2, val2, decimal=2)
np.testing.assert_array_almost_equal(val1, val3, decimal=2)
np.testing.assert_array_almost_equal([val1] * 2, val4, decimal=2)
def evaluate_operators(
self,
state: Union[str, dict, Result, list, np.ndarray, Statevector,
QuantumCircuit, Instruction, OperatorBase, ],
operators: Union[PauliSumOp, OperatorBase, list, dict],
) -> Union[Optional[float], List[Optional[float]], Dict[
str, List[Optional[float]]]]:
"""Evaluates additional operators at the given state.
Args:
state: any kind of input that can be used to specify a state. See also ``StateFn`` for
more details.
operators: either a single, list or dictionary of ``PauliSumOp``s or any kind
of operator implementing the ``OperatorBase``.
Returns:
The expectation value of the given operator(s). The return type will be identical to the
format of the provided operators.
"""
if isinstance(self._solver, MinimumEigensolverFactory):
# try to get a QuantumInstance from the solver
quantum_instance = getattr(self._solver.minimum_eigensolver,
"quantum_instance", None)
# and try to get an Expectation from the solver
expectation = getattr(self._solver.minimum_eigensolver,
"expectation", None)
else:
quantum_instance = getattr(self._solver, "quantum_instance", None)
expectation = getattr(self._solver, "expectation", None)
if not isinstance(state, StateFn):
state = StateFn(state)
# handle all possible formats of operators
# i.e. if a user gives us a dict of operators, we return the results equivalently, etc.
if isinstance(operators, list):
results = [] # type: ignore
for op in operators:
if op is None:
results.append(None)
else:
results.append(
self._eval_op(state, op, quantum_instance,
expectation))
elif isinstance(operators, dict):
results = {} # type: ignore
for name, op in operators.items():
if op is None:
results[name] = None
else:
results[name] = self._eval_op(state, op, quantum_instance,
expectation)
else:
if operators is None:
results = None
else:
results = self._eval_op(state, operators, quantum_instance,
expectation)
return results
def test_operator_coefficient_gradient(self, method):
"""Test the operator coefficient gradient
Tr( | psi > < psi | Z) = sin(a)sin(b)
Tr( | psi > < psi | X) = cos(a)
"""
a = Parameter("a")
b = Parameter("b")
q = QuantumRegister(1)
qc = QuantumCircuit(q)
qc.h(q)
qc.rz(a, q[0])
qc.rx(b, q[0])
coeff_0 = Parameter("c_0")
coeff_1 = Parameter("c_1")
ham = coeff_0 * X + coeff_1 * Z
op = StateFn(ham, is_measurement=True) @ CircuitStateFn(primitive=qc, coeff=1.0)
gradient_coeffs = [coeff_0, coeff_1]
coeff_grad = Gradient(grad_method=method).convert(op, gradient_coeffs)
values_dict = [
{coeff_0: 0.5, coeff_1: -1, a: np.pi / 4, b: np.pi},
{coeff_0: 0.5, coeff_1: -1, a: np.pi / 4, b: np.pi / 4},
]
correct_values = [[1 / np.sqrt(2), 0], [1 / np.sqrt(2), 1 / 2]]
for i, value_dict in enumerate(values_dict):
np.testing.assert_array_almost_equal(
coeff_grad.assign_parameters(value_dict).eval(), correct_values[i], decimal=1
)
def test_grad_combo_fn_chain_rule_nat_grad(self):
"""Test the chain rule for a custom gradient combo function."""
np.random.seed(2)
def combo_fn(x):
amplitudes = x[0].primitive.data
pdf = np.multiply(amplitudes, np.conj(amplitudes))
return np.sum(np.log(pdf)) / (-len(amplitudes))
def grad_combo_fn(x):
amplitudes = x[0].primitive.data
pdf = np.multiply(amplitudes, np.conj(amplitudes))
grad = []
for prob in pdf:
grad += [-1 / prob]
return grad
try:
qc = RealAmplitudes(2, reps=1)
grad_op = ListOp([StateFn(qc)], combo_fn=combo_fn, grad_combo_fn=grad_combo_fn)
grad = NaturalGradient(grad_method="lin_comb", regularization="ridge").convert(
grad_op, qc.ordered_parameters
)
value_dict = dict(
zip(qc.ordered_parameters, np.random.rand(len(qc.ordered_parameters)))
)
correct_values = [[0.20777236], [-18.92560338], [-15.89005475], [-10.44002031]]
np.testing.assert_array_almost_equal(
grad.assign_parameters(value_dict).eval(), correct_values, decimal=3
)
except MissingOptionalLibraryError as ex:
self.skipTest(str(ex))
def test_natural_gradient(self, method, regularization):
"""Test the natural gradient"""
try:
for params in (ParameterVector("a", 2), [Parameter("a"), Parameter("b")]):
ham = 0.5 * X - 1 * Z
q = QuantumRegister(1)
qc = QuantumCircuit(q)
qc.h(q)
qc.rz(params[0], q[0])
qc.rx(params[1], q[0])
op = ~StateFn(ham) @ CircuitStateFn(primitive=qc, coeff=1.0)
nat_grad = NaturalGradient(
grad_method=method, regularization=regularization
).convert(operator=op)
values_dict = [{params[0]: np.pi / 4, params[1]: np.pi / 2}]
# reference values obtained by classically computing the natural gradients
correct_values = [[-3.26, 1.63]] if regularization == "ridge" else [[-4.24, 0]]
for i, value_dict in enumerate(values_dict):
np.testing.assert_array_almost_equal(
nat_grad.assign_parameters(value_dict).eval(), correct_values[i], decimal=1
)
except MissingOptionalLibraryError as ex:
self.skipTest(str(ex))
def _eval_op(self, state, op, quantum_instance, expectation):
# if the operator is empty we simply return 0
if op == 0:
# Note, that for some reason the individual results need to be wrapped in lists.
# See also: VQE._eval_aux_ops()
return [0.0j]
exp = ~StateFn(op) @ state # <state|op|state>
if quantum_instance is not None:
try:
sampler = CircuitSampler(quantum_instance)
if expectation is not None:
exp = expectation.convert(exp)
result = sampler.convert(exp).eval()
except ValueError:
# TODO make this cleaner. The reason for it being here is that some quantum
# instances can lead to non-positive statevectors which the Qiskit circuit
# Initializer is unable to handle.
result = exp.eval()
else:
result = exp.eval()
# Note, that for some reason the individual results need to be wrapped in lists.
# See also: VQE._eval_aux_ops()
return [result]
def test_state_gradient3(self, method):
"""Test the state gradient 3
Tr(|psi><psi|Z) = sin(a)sin(c(a)) = sin(a)sin(cos(a)+1)
Tr(|psi><psi|X) = cos(a)
d<H>/da = - 0.5 sin(a) - 1 cos(a)sin(cos(a)+1) + 1 sin^2(a)cos(cos(a)+1)
"""
ham = 0.5 * X - 1 * Z
a = Parameter('a')
# b = Parameter('b')
params = a
x = Symbol('x')
expr = cos(x) + 1
c = ParameterExpression({a: x}, expr)
q = QuantumRegister(1)
qc = QuantumCircuit(q)
qc.h(q)
qc.rz(a, q[0])
qc.rx(c, q[0])
op = ~StateFn(ham) @ CircuitStateFn(primitive=qc, coeff=1.)
state_grad = Gradient(grad_method=method).convert(operator=op,
params=params)
values_dict = [{a: np.pi / 4}, {a: 0}, {a: np.pi / 2}]
correct_values = [-1.1220, -0.9093, 0.0403]
for i, value_dict in enumerate(values_dict):
np.testing.assert_array_almost_equal(
state_grad.assign_parameters(value_dict).eval(),
correct_values[i],
decimal=1)
def test_natural_gradient(self, method, regularization):
"""Test the natural gradient"""
try:
ham = 0.5 * X - 1 * Z
a = Parameter('a')
b = Parameter('b')
params = [a, b]
q = QuantumRegister(1)
qc = QuantumCircuit(q)
qc.h(q)
qc.rz(params[0], q[0])
qc.rx(params[1], q[0])
op = ~StateFn(ham) @ CircuitStateFn(primitive=qc, coeff=1.)
nat_grad = NaturalGradient(grad_method=method,
regularization=regularization).convert(
operator=op, params=params)
values_dict = [{params[0]: np.pi / 4, params[1]: np.pi / 2}]
correct_values = [[-2.36003979, 2.06503481]] \
if regularization == 'ridge' else [[-4.2, 0]]
for i, value_dict in enumerate(values_dict):
np.testing.assert_array_almost_equal(
nat_grad.assign_parameters(value_dict).eval(),
correct_values[i],
decimal=0)
except MissingOptionalLibraryError as ex:
self.skipTest(str(ex))
def test_grad_combo_fn_chain_rule(self, method):
"""
Test the chain rule for a custom gradient combo function
"""
np.random.seed(2)
def combo_fn(x):
amplitudes = x[0].primitive.data
pdf = np.multiply(amplitudes, np.conj(amplitudes))
return np.sum(np.log(pdf)) / (-len(amplitudes))
def grad_combo_fn(x):
amplitudes = x[0].primitive.data
pdf = np.multiply(amplitudes, np.conj(amplitudes))
grad = []
for prob in pdf:
grad += [-1 / prob]
return grad
qc = RealAmplitudes(2, reps=1)
grad_op = ListOp([StateFn(qc)],
combo_fn=combo_fn,
grad_combo_fn=grad_combo_fn)
grad = Gradient(grad_method=method).convert(grad_op,
qc.ordered_parameters)
value_dict = dict(
zip(qc.ordered_parameters,
np.random.rand(len(qc.ordered_parameters))))
correct_values = [[(-0.16666259133549044 + 0j)],
[(-7.244949702732864 + 0j)],
[(-2.979791752749964 + 0j)],
[(-5.310186078432614 + 0j)]]
np.testing.assert_array_almost_equal(
grad.assign_parameters(value_dict).eval(), correct_values)
def test_list_pauli_sum_op(self):
"""Test PauliExpectation for List[PauliSumOp]"""
test_op = ListOp([~StateFn(PauliSumOp.from_list([("XX", 1), ("ZI", 3), ("ZZ", 5)]))])
observable = self.expect.convert(test_op)
self.assertIsInstance(observable, ListOp)
self.assertIsInstance(observable[0][0][0].primitive, PauliSumOp)
self.assertIsInstance(observable[0][1][0].primitive, PauliSumOp)
def test_natural_gradient4(self, grad_method, qfi_method, regularization):
"""Test the natural gradient 4"""
# Avoid regularization = lasso intentionally because it does not converge
try:
ham = 0.5 * X - 1 * Z
a = Parameter('a')
params = a
q = QuantumRegister(1)
qc = QuantumCircuit(q)
qc.h(q)
qc.rz(a, q[0])
op = ~StateFn(ham) @ CircuitStateFn(primitive=qc, coeff=1.)
nat_grad = NaturalGradient(grad_method=grad_method,
qfi_method=qfi_method,
regularization=regularization).convert(
operator=op, params=params)
values_dict = [{a: np.pi / 4}]
correct_values = [[0.]] if regularization == 'ridge' else [[
-1.41421342
]]
for i, value_dict in enumerate(values_dict):
np.testing.assert_array_almost_equal(
nat_grad.assign_parameters(value_dict).eval(),
correct_values[i],
decimal=0)
except MissingOptionalLibraryError as ex:
self.skipTest(str(ex))
def test_gradient_p(self, method):
"""Test the state gradient for p
|psi> = 1/sqrt(2)[[1, exp(ia)]]
Tr(|psi><psi|Z) = 0
Tr(|psi><psi|X) = cos(a)
d<H>/da = - 0.5 sin(a)
"""
ham = 0.5 * X - 1 * Z
a = Parameter('a')
params = a
q = QuantumRegister(1)
qc = QuantumCircuit(q)
qc.h(q)
qc.p(a, q[0])
op = ~StateFn(ham) @ CircuitStateFn(primitive=qc, coeff=1.)
state_grad = Gradient(grad_method=method).convert(operator=op,
params=params)
values_dict = [{a: np.pi / 4}, {a: 0}, {a: np.pi / 2}]
correct_values = [-0.5 / np.sqrt(2), 0, -0.5]
for i, value_dict in enumerate(values_dict):
np.testing.assert_array_almost_equal(
state_grad.assign_parameters(value_dict).eval(),
correct_values[i],
decimal=1)
def test_pauli_expect_op_vector(self):
""" pauli expect op vector test """
paulis_op = ListOp([X, Y, Z, I])
converted_meas = self.expect.convert(~StateFn(paulis_op))
plus_mean = (converted_meas @ Plus)
sampled_plus = self.sampler.convert(plus_mean)
np.testing.assert_array_almost_equal(sampled_plus.eval(), [1, 0, 0, 1],
decimal=1)
minus_mean = (converted_meas @ Minus)
sampled_minus = self.sampler.convert(minus_mean)
np.testing.assert_array_almost_equal(sampled_minus.eval(),
[-1, 0, 0, 1],
decimal=1)
zero_mean = (converted_meas @ Zero)
sampled_zero = self.sampler.convert(zero_mean)
np.testing.assert_array_almost_equal(sampled_zero.eval(), [0, 0, 1, 1],
decimal=1)
sum_zero = (Plus + Minus) * (.5**.5)
sum_zero_mean = (converted_meas @ sum_zero)
sampled_zero_mean = self.sampler.convert(sum_zero_mean)
# !!NOTE!!: Depolarizing channel (Sampling) means interference
# does not happen between circuits in sum, so expectation does
# not equal expectation for Zero!!
np.testing.assert_array_almost_equal(sampled_zero_mean.eval(),
[0, 0, 0, 2],
decimal=1)
def test_state_gradient2(self, method):
"""Test the state gradient 2
Tr(|psi><psi|Z) = sin(a)sin(a)
Tr(|psi><psi|X) = cos(a)
d<H>/da = - 0.5 sin(a) - 2 cos(a)sin(a)
"""
ham = 0.5 * X - 1 * Z
a = Parameter('a')
# b = Parameter('b')
params = [a]
q = QuantumRegister(1)
qc = QuantumCircuit(q)
qc.h(q)
qc.rz(a, q[0])
qc.rx(a, q[0])
op = ~StateFn(ham) @ CircuitStateFn(primitive=qc, coeff=1.)
state_grad = Gradient(grad_method=method).convert(operator=op,
params=params)
values_dict = [{a: np.pi / 4}, {a: 0}, {a: np.pi / 2}]
correct_values = [-1.353553, -0, -0.5]
for i, value_dict in enumerate(values_dict):
np.testing.assert_array_almost_equal(
state_grad.assign_parameters(value_dict).eval(),
correct_values[i],
decimal=1)
def test_circuit_sampler(self, method):
"""Test the gradient with circuit sampler
Tr(|psi><psi|Z) = sin(a)sin(b)
Tr(|psi><psi|X) = cos(a)
d<H>/da = - 0.5 sin(a) - 1 cos(a)sin(b)
d<H>/db = - 1 sin(a)cos(b)
"""
ham = 0.5 * X - 1 * Z
a = Parameter("a")
b = Parameter("b")
params = [a, b]
q = QuantumRegister(1)
qc = QuantumCircuit(q)
qc.h(q)
qc.rz(params[0], q[0])
qc.rx(params[1], q[0])
op = ~StateFn(ham) @ CircuitStateFn(primitive=qc, coeff=1.0)
shots = 8000
if method == "fin_diff":
np.random.seed(8)
state_grad = Gradient(grad_method=method,
epsilon=shots**(-1 /
6.0)).convert(operator=op)
else:
state_grad = Gradient(grad_method=method).convert(operator=op)
values_dict = [
{
a: np.pi / 4,
b: np.pi
},
{
params[0]: np.pi / 4,
params[1]: np.pi / 4
},
{
params[0]: np.pi / 2,
params[1]: np.pi / 4
},
]
correct_values = [
[-0.5 / np.sqrt(2), 1 / np.sqrt(2)],
[-0.5 / np.sqrt(2) - 0.5, -1 / 2.0],
[-0.5, -1 / np.sqrt(2)],
]
backend = BasicAer.get_backend("qasm_simulator")
q_instance = QuantumInstance(backend=backend, shots=shots)
for i, value_dict in enumerate(values_dict):
sampler = CircuitSampler(backend=q_instance).convert(
state_grad, params={k: [v]
for k, v in value_dict.items()})
np.testing.assert_array_almost_equal(sampler.eval()[0],
correct_values[i],
decimal=1)
def test_add_direct(self):
"""add direct test"""
wf = StateFn({"101010": 0.5, "111111": 0.3}) + (Zero ^ 6)
self.assertEqual(wf.primitive, {
"101010": 0.5,
"111111": 0.3,
"000000": 1.0
})
wf = (4 * StateFn({
"101010": 0.5,
"111111": 0.3
})) + ((3 + 0.1j) * (Zero ^ 6))
self.assertEqual(wf.primitive, {
"000000": (3 + 0.1j),
"101010": (2 + 0j),
"111111": (1.2 + 0j)
})
def test_list_pauli_sum(self):
"""Test AerPauliExpectation for ListOp[PauliSumOp]"""
test_op = ListOp(
[PauliSumOp.from_list([("XX", 1), ("ZI", 3), ("ZZ", 5)])])
observable = AerPauliExpectation().convert(~StateFn(test_op))
self.assertIsInstance(observable, ListOp)
self.assertIsInstance(observable[0], CircuitStateFn)
self.assertTrue(observable[0].is_measurement)
def test_add_direct(self):
""" add direct test """
wf = StateFn({'101010': .5, '111111': .3}) + (Zero ^ 6)
self.assertEqual(wf.primitive, {
'101010': 0.5,
'111111': 0.3,
'000000': 1.0
})
wf = (4 * StateFn({
'101010': .5,
'111111': .3
})) + ((3 + .1j) * (Zero ^ 6))
self.assertEqual(wf.primitive, {
'000000': (3 + 0.1j),
'101010': (2 + 0j),
'111111': (1.2 + 0j)
})
def test_pauli_two_design(self, method):
"""Test SPSA on the Pauli two-design example."""
circuit = PauliTwoDesign(3, reps=1, seed=1)
parameters = list(circuit.parameters)
obs = Z ^ Z ^ I
expr = ~StateFn(obs) @ StateFn(circuit)
initial_point = np.array([
0.82311034, 0.02611798, 0.21077064, 0.61842177, 0.09828447,
0.62013131
])
def objective(x):
return expr.bind_parameters(dict(zip(parameters, x))).eval().real
settings = {"maxiter": 100, "blocking": True, "allowed_increase": 0}
if method == "2spsa":
settings["second_order"] = True
settings["regularization"] = 0.01
expected_nfev = settings["maxiter"] * 5 + 1
elif method == "qnspsa":
settings["fidelity"] = QNSPSA.get_fidelity(circuit)
settings["regularization"] = 0.001
settings["learning_rate"] = 0.05
settings["perturbation"] = 0.05
expected_nfev = settings["maxiter"] * 7 + 1
else:
expected_nfev = settings["maxiter"] * 3 + 1
if method == "qnspsa":
spsa = QNSPSA(**settings)
else:
spsa = SPSA(**settings)
with self.assertWarns(DeprecationWarning):
result = spsa.optimize(circuit.num_parameters,
objective,
initial_point=initial_point)
with self.subTest("check final accuracy"):
self.assertLess(result[1], -0.95) # final loss
with self.subTest("check number of function calls"):
self.assertEqual(result[2], expected_nfev) # function evaluations
def test_opflow_qnn_2_2(self, q_i):
""" Test Opflow QNN with input/output dimension 2/2."""
if q_i == 'sv':
quantum_instance = self.sv_quantum_instance
else:
quantum_instance = self.qasm_quantum_instance
# construct parametrized circuit
params_1 = [Parameter('input1'), Parameter('weight1')]
qc_1 = QuantumCircuit(1)
qc_1.h(0)
qc_1.ry(params_1[0], 0)
qc_1.rx(params_1[1], 0)
qc_sfn_1 = StateFn(qc_1)
# construct cost operator
h_1 = StateFn(PauliSumOp.from_list([('Z', 1.0), ('X', 1.0)]))
# combine operator and circuit to objective function
op_1 = ~h_1 @ qc_sfn_1
# construct parametrized circuit
params_2 = [Parameter('input2'), Parameter('weight2')]
qc_2 = QuantumCircuit(1)
qc_2.h(0)
qc_2.ry(params_2[0], 0)
qc_2.rx(params_2[1], 0)
qc_sfn_2 = StateFn(qc_2)
# construct cost operator
h_2 = StateFn(PauliSumOp.from_list([('Z', 1.0), ('X', 1.0)]))
# combine operator and circuit to objective function
op_2 = ~h_2 @ qc_sfn_2
op = ListOp([op_1, op_2])
qnn = OpflowQNN(op, [params_1[0], params_2[0]],
[params_1[1], params_2[1]],
quantum_instance=quantum_instance)
test_data = [np.array([1, 2]), np.array([[1, 2], [3, 4]])]
# test model
self.validate_output_shape(qnn, test_data)
def test_overlap_qfi_raises_on_unsupported_gate(self):
"""Test the overlap QFI raises an appropriate error on multi-param unbound gates."""
x = Parameter("x")
circuit = QuantumCircuit(1)
circuit.p(x, 0)
with self.assertRaises(NotImplementedError):
_ = QFI("overlap_diag").convert(StateFn(circuit), [x])
def test_overlap_qfi_raises_on_multiparam(self):
"""Test the overlap QFI raises an appropriate error on multi-param unbound gates."""
x = ParameterVector("x", 2)
circuit = QuantumCircuit(1)
circuit.u(x[0], x[1], 2, 0)
with self.assertRaises(NotImplementedError):
_ = QFI("overlap_diag").convert(StateFn(circuit), [x])
def construct_total_circuit_local(self, time_step):
## This function creates the circuit that will be used to evaluate overlap and its gradient, in a local fashion
# First, create the Trotter step
step_h = time_step * self.hamiltonian
trotter = PauliTrotterEvolution(reps=1)
U_dt = trotter.convert(step_h.exp_i()).to_circuit()
l_circ = self.ansatz.assign_parameters({self.params_vec: self.left})
r_circ = self.ansatz.assign_parameters({self.params_vec: self.right})
## Projector
zero_prj = StateFn(projector_zero_local(self.hamiltonian.num_qubits),
is_measurement=True)
state_wfn = zero_prj @ StateFn(r_circ + U_dt + l_circ.inverse())
return state_wfn
def test_circuit_state_fn_from_dict_initialize(self):
"""state fn circuit from dict initialize test"""
statedict = {"101": 0.5, "100": 0.1, "000": 0.2, "111": 0.5}
sfc = CircuitStateFn.from_dict(statedict)
self.assertIsInstance(sfc, CircuitStateFn)
samples = sfc.sample()
np.testing.assert_array_almost_equal(
StateFn(statedict).to_matrix(),
np.round(sfc.to_matrix(), decimals=1))
for k, v in samples.items():
self.assertIn(k, statedict)
# It's ok if these are far apart because the dict is sampled.
self.assertAlmostEqual(v, np.abs(statedict[k])**0.5, delta=0.5)
# Follows same code path as above, but testing to be thorough
sfc_vector = CircuitStateFn.from_vector(StateFn(statedict).to_matrix())
np.testing.assert_array_almost_equal(
StateFn(statedict).to_matrix(), sfc_vector.to_matrix())
def test_pauli_expect_op_vector(self):
"""pauli expect op vector test"""
paulis_op = ListOp([X, Y, Z, I])
converted_meas = self.expect.convert(~StateFn(paulis_op))
plus_mean = converted_meas @ Plus
np.testing.assert_array_almost_equal(plus_mean.eval(), [1, 0, 0, 1],
decimal=1)
sampled_plus = self.sampler.convert(plus_mean)
np.testing.assert_array_almost_equal(sampled_plus.eval(), [1, 0, 0, 1],
decimal=1)
minus_mean = converted_meas @ Minus
np.testing.assert_array_almost_equal(minus_mean.eval(), [-1, 0, 0, 1],
decimal=1)
sampled_minus = self.sampler.convert(minus_mean)
np.testing.assert_array_almost_equal(sampled_minus.eval(),
[-1, 0, 0, 1],
decimal=1)
zero_mean = converted_meas @ Zero
np.testing.assert_array_almost_equal(zero_mean.eval(), [0, 0, 1, 1],
decimal=1)
sampled_zero = self.sampler.convert(zero_mean)
np.testing.assert_array_almost_equal(sampled_zero.eval(), [0, 0, 1, 1],
decimal=1)
sum_zero = (Plus + Minus) * (0.5**0.5)
sum_zero_mean = converted_meas @ sum_zero
np.testing.assert_array_almost_equal(sum_zero_mean.eval(),
[0, 0, 1, 1],
decimal=1)
sampled_zero_mean = self.sampler.convert(sum_zero_mean)
# !!NOTE!!: Depolarizing channel (Sampling) means interference
# does not happen between circuits in sum, so expectation does
# not equal expectation for Zero!!
np.testing.assert_array_almost_equal(sampled_zero_mean.eval(),
[0, 0, 0, 1],
decimal=1)
for i, op in enumerate(paulis_op.oplist):
mat_op = op.to_matrix()
np.testing.assert_array_almost_equal(
zero_mean.eval()[i],
Zero.adjoint().to_matrix() @ mat_op @ Zero.to_matrix(),
decimal=1,
)
np.testing.assert_array_almost_equal(
plus_mean.eval()[i],
Plus.adjoint().to_matrix() @ mat_op @ Plus.to_matrix(),
decimal=1,
)
np.testing.assert_array_almost_equal(
minus_mean.eval()[i],
Minus.adjoint().to_matrix() @ mat_op @ Minus.to_matrix(),
decimal=1,
)
def test_sampling(self):
"""state fn circuit from dict initialize test"""
statedict = {
"101": 0.5 + 1.0j,
"100": 0.1 + 2.0j,
"000": 0.2 + 0.0j,
"111": 0.5 + 1.0j
}
sfc = CircuitStateFn.from_dict(statedict)
circ_samples = sfc.sample()
dict_samples = StateFn(statedict).sample()
vec_samples = StateFn(statedict).to_matrix_op().sample()
for k, v in circ_samples.items():
self.assertIn(k, dict_samples)
self.assertIn(k, vec_samples)
# It's ok if these are far apart because the dict is sampled.
self.assertAlmostEqual(v, np.abs(dict_samples[k])**0.5, delta=0.5)
self.assertAlmostEqual(v, np.abs(vec_samples[k])**0.5, delta=0.5)