def test_pauli_error_2q_gate_from_pauli(self):
"""Test two-qubit pauli error as gate qobj from Pauli obj"""
paulis = [qi.Pauli(s) for s in ['XZ', 'YX', 'ZY']]
probs = [0.5, 0.3, 0.2]
actual = pauli_error(zip(paulis, probs))
expected = QuantumError(
[(PauliGate("XZ"), 0.5), (PauliGate("YX"), 0.3), (PauliGate("ZY"), 0.2)]
)
for i in range(actual.size):
circ, prob = actual.error_term(i)
expected_circ, expected_prob = expected.error_term(i)
self.assertEqual(circ, expected_circ, msg=f"Incorrect {i}-th circuit")
self.assertAlmostEqual(prob, expected_prob, msg=f"Incorrect {i}-th probability")
def to_instruction(self):
"""Convert to Pauli circuit instruction."""
from math import pi
pauli, phase = self._to_label(self.z,
self.x,
self._phase[0],
full_group=False,
return_phase=True)
if len(pauli) == 1:
gate = {
"I": IGate(),
"X": XGate(),
"Y": YGate(),
"Z": ZGate()
}[pauli]
else:
gate = PauliGate(pauli)
if not phase:
return gate
# Add global phase
circuit = QuantumCircuit(self.num_qubits, name=str(self))
circuit.global_phase = -phase * pi / 2
circuit.append(gate, range(self.num_qubits))
return circuit.to_instruction()
def to_circuit(self) -> QuantumCircuit:
pauli = self.primitive.to_label()[-self.num_qubits:]
phase = self.primitive.phase
qc = QuantumCircuit(self.num_qubits)
if pauli == "I" * self.num_qubits:
qc.global_phase = -phase * pi / 2
return qc
if self.num_qubits == 1:
gate = {
"I": IGate(),
"X": XGate(),
"Y": YGate(),
"Z": ZGate()
}[pauli]
else:
gate = PauliGate(pauli)
qc.append(gate, range(self.num_qubits))
if not phase:
return qc
qc.global_phase = -phase * pi / 2
return qc
def test_from_dict(self):
noise_ops_1q = [((IGate(), [0]), 0.9),
((XGate(), [0]), 0.1)]
noise_ops_2q = [((PauliGate('II'), [0, 1]), 0.9),
((PauliGate('IX'), [0, 1]), 0.045),
((PauliGate('XI'), [0, 1]), 0.045),
((PauliGate('XX'), [0, 1]), 0.01)]
noise_model = NoiseModel()
with self.assertWarns(DeprecationWarning):
noise_model.add_quantum_error(QuantumError(noise_ops_1q, 1), 'h', [0])
noise_model.add_quantum_error(QuantumError(noise_ops_1q, 1), 'h', [1])
noise_model.add_quantum_error(QuantumError(noise_ops_2q, 2), 'cx', [0, 1])
noise_model.add_quantum_error(QuantumError(noise_ops_2q, 2), 'cx', [1, 0])
deserialized = NoiseModel.from_dict(noise_model.to_dict())
self.assertEqual(noise_model, deserialized)
def test_init_pauli_gate(self, label):
"""Test initialization from Pauli basis gates"""
pauli = Pauli(PauliGate(label))
self.assertEqual(str(pauli), label)
def _to_circuit(cls, op):
if isinstance(op, QuantumCircuit):
return op
if isinstance(op, tuple):
inst, qubits = op
circ = QuantumCircuit(max(qubits) + 1)
circ.append(inst, qargs=qubits)
return circ
if isinstance(op, Instruction):
if op.num_clbits > 0:
raise NoiseError(
f"Unable to convert instruction with clbits: {op.__class__.__name__}"
)
circ = QuantumCircuit(op.num_qubits)
circ.append(op, qargs=list(range(op.num_qubits)))
return circ
if isinstance(op, QuantumChannel):
if not op.is_cptp(atol=cls.atol):
raise NoiseError("Input quantum channel is not CPTP.")
try:
return cls._to_circuit(Kraus(op).to_instruction())
except QiskitError as err:
raise NoiseError(
f"Fail to convert {op.__class__.__name__} to Instruction."
) from err
if isinstance(op, BaseOperator):
if hasattr(op, 'to_instruction'):
try:
return cls._to_circuit(op.to_instruction())
except QiskitError as err:
raise NoiseError(
f"Fail to convert {op.__class__.__name__} to Instruction."
) from err
else:
raise NoiseError(
f"Unacceptable Operator, not implementing to_instruction: "
f"{op.__class__.__name__}")
if isinstance(op, list):
if all(isinstance(aop, tuple) for aop in op):
num_qubits = max([max(qubits) for _, qubits in op]) + 1
circ = QuantumCircuit(num_qubits)
for inst, qubits in op:
try:
circ.append(inst, qargs=qubits)
except CircuitError as err:
raise NoiseError(
f"Invalid operation type: {inst.__class__.__name__},"
f" not appendable to circuit.") from err
return circ
# Support for old-style json-like input TODO: to be removed
elif all(isinstance(aop, dict) for aop in op):
warnings.warn(
'Constructing QuantumError with list of dict representing a mixed channel'
' has been deprecated as of qiskit-aer 0.10.0 and will be removed'
' no earlier than 3 months from that release date.',
DeprecationWarning,
stacklevel=3)
# Convert json-like to non-kraus Instruction
num_qubits = max([max(dic['qubits']) for dic in op]) + 1
circ = QuantumCircuit(num_qubits)
for dic in op:
if dic['name'] == 'reset':
# pylint: disable=import-outside-toplevel
from qiskit.circuit import Reset
circ.append(Reset(), qargs=dic['qubits'])
elif dic['name'] == 'kraus':
circ.append(Instruction(name='kraus',
num_qubits=len(dic['qubits']),
num_clbits=0,
params=dic['params']),
qargs=dic['qubits'])
elif dic['name'] == 'unitary':
circ.append(UnitaryGate(data=dic['params'][0]),
qargs=dic['qubits'])
elif dic['name'] == 'pauli':
circ.append(PauliGate(dic['params'][0]),
qargs=dic['qubits'])
else:
with warnings.catch_warnings():
warnings.filterwarnings(
"ignore",
category=DeprecationWarning,
module=
"qiskit.providers.aer.noise.errors.errorutils")
circ.append(UnitaryGate(label=dic['name'],
data=standard_gate_unitary(
dic['name'])),
qargs=dic['qubits'])
return circ
else:
raise NoiseError(f"Invalid type of op list: {op}")
raise NoiseError(
f"Invalid noise op type {op.__class__.__name__}: {op}")
def test_depolarizing_error_2q_gate(self):
"""Test 2-qubit depolarizing error as gate qobj"""
p_depol = 0.3
actual = depolarizing_error(p_depol, 2)
expected = QuantumError([
(PauliGate("II"), 1 - p_depol * 15 / 16),
(PauliGate("IX"), p_depol / 16),
(PauliGate("IY"), p_depol / 16),
(PauliGate("IZ"), p_depol / 16),
(PauliGate("XI"), p_depol / 16),
(PauliGate("XX"), p_depol / 16),
(PauliGate("XY"), p_depol / 16),
(PauliGate("XZ"), p_depol / 16),
(PauliGate("YI"), p_depol / 16),
(PauliGate("YX"), p_depol / 16),
(PauliGate("YY"), p_depol / 16),
(PauliGate("YZ"), p_depol / 16),
(PauliGate("ZI"), p_depol / 16),
(PauliGate("ZX"), p_depol / 16),
(PauliGate("ZY"), p_depol / 16),
(PauliGate("ZZ"), p_depol / 16),
])
for i in range(actual.size):
circ, prob = actual.error_term(i)
expected_circ, expected_prob = expected.error_term(i)
self.assertEqual(circ, expected_circ, msg=f"Incorrect {i}-th circuit")
self.assertAlmostEqual(prob, expected_prob, msg=f"Incorrect {i}-th probability")