def test_asymmetric_depolarizing_channel():
d = cirq.asymmetric_depolarize(0.1, 0.2, 0.3)
np.testing.assert_almost_equal(
cirq.kraus(d),
(np.sqrt(0.4) * np.eye(2), np.sqrt(0.1) * X, np.sqrt(0.2) * Y,
np.sqrt(0.3) * Z),
)
assert cirq.has_kraus(d)
assert cirq.AsymmetricDepolarizingChannel(p_x=0, p_y=0.1,
p_z=0).num_qubits() == 1
def get_supported_channels():
"""A helper to get the channels that are supported in TFQ.
Returns a dictionary mapping from supported channel types
to number of qubits.
"""
# Add new channels here whenever additional support is needed.
channel_mapping = dict()
channel_mapping[cirq.DepolarizingChannel(0.01)] = 1
channel_mapping[cirq.AsymmetricDepolarizingChannel(0.01, 0.02, 0.03)] = 1
return channel_mapping
def test_asymmetric_depolarizing_channel_repr():
cirq.testing.assert_equivalent_repr(
cirq.AsymmetricDepolarizingChannel(0.1, 0.2, 0.3))
def test_multi_asymmetric_depolarizing_channel_repr():
cirq.testing.assert_equivalent_repr(
cirq.AsymmetricDepolarizingChannel(error_probabilities={
'II': 0.8,
'XX': 0.2
}))
buffer.seek(0)
with pytest.raises(ValueError) as e:
cirq.read_json(buffer)
assert e.match("Could not resolve type 'MyCustomClass' "
"during deserialization")
QUBITS = cirq.LineQubit.range(5)
Q0, Q1, Q2, Q3, Q4 = QUBITS
TEST_OBJECTS = {
'AmplitudeDampingChannel':
cirq.AmplitudeDampingChannel(0.5),
'AsymmetricDepolarizingChannel':
cirq.AsymmetricDepolarizingChannel(0.1, 0.2, 0.3),
'BitFlipChannel':
cirq.BitFlipChannel(0.5),
'Bristlecone':
cirq.google.Bristlecone,
'CCNOT':
cirq.CCNOT,
'CCX':
cirq.CCX,
'CCXPowGate':
cirq.CCXPowGate(exponent=0.123, global_shift=0.456),
'CCZ':
cirq.CCZ,
'CCZPowGate':
cirq.CCZPowGate(exponent=0.123, global_shift=0.456),
'CNOT':
def test_asymmetric_depolarizing_channel_apply_two_qubits():
q0, q1 = cirq.LineQubit.range(2)
op = cirq.AsymmetricDepolarizingChannel(error_probabilities={'XX': 0.1})
op(q0, q1)