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
channel_mapping[cirq.GeneralizedAmplitudeDampingChannel(0.01, 0.02)] = 1
channel_mapping[cirq.AmplitudeDampingChannel(0.01)] = 1
channel_mapping[cirq.ResetChannel()] = 1
channel_mapping[cirq.PhaseDampingChannel(0.01)] = 1
channel_mapping[cirq.PhaseFlipChannel(0.01)] = 1
channel_mapping[cirq.BitFlipChannel(0.01)] = 1
return channel_mapping
def test_phase_flip_channel_repr():
cirq.testing.assert_equivalent_repr(cirq.PhaseFlipChannel(0.3))
'NO_NOISE':
cirq.NO_NOISE,
'NamedQubit':
cirq.NamedQubit('hi mom'),
'PauliString': [
cirq.PauliString({
Q0: cirq.X,
Q1: cirq.Y,
Q2: cirq.Z
}),
cirq.X(Q0) * cirq.Y(Q1) * 123
],
'PhaseDampingChannel':
cirq.PhaseDampingChannel(0.5),
'PhaseFlipChannel':
cirq.PhaseFlipChannel(0.5),
'PhaseGradientGate':
cirq.PhaseGradientGate(num_qubits=3, exponent=0.235),
'PhasedISwapPowGate':
cirq.PhasedISwapPowGate(phase_exponent=0.1, exponent=0.2),
'PhasedXPowGate':
cirq.PhasedXPowGate(phase_exponent=0.123,
exponent=0.456,
global_shift=0.789),
'QuantumFourierTransformGate':
cirq.QuantumFourierTransformGate(num_qubits=2, without_reverse=True),
'ResetChannel':
cirq.ResetChannel(),
'X':
cirq.X,
'Y':
cirq.Circuit(cirq.H(a), cirq.CNOT(a, b), cirq.measure(a, b),
cirq.reset(a)))
assert (str(c).strip() == """
H 0
CX 0 1
M 0 1
R 0
""".strip())
@pytest.mark.parametrize(
"gate",
[
cirq.BitFlipChannel(0.1),
cirq.BitFlipChannel(0.2),
cirq.PhaseFlipChannel(0.1),
cirq.PhaseFlipChannel(0.2),
cirq.PhaseDampingChannel(0.1),
cirq.PhaseDampingChannel(0.2),
cirq.X.with_probability(0.1),
cirq.X.with_probability(0.2),
cirq.Y.with_probability(0.1),
cirq.Y.with_probability(0.2),
cirq.Z.with_probability(0.1),
cirq.Z.with_probability(0.2),
cirq.DepolarizingChannel(0.1),
cirq.DepolarizingChannel(0.2),
cirq.DepolarizingChannel(0.1, n_qubits=2),
cirq.DepolarizingChannel(0.2, n_qubits=2),
],
)
