def test_non_identity_scale_1q():
"""Tests that when scale factor = 1, the circuit is the
same.
"""
qreg = LineQubit.range(3)
circ = Circuit([ops.rx(np.pi * 1.0).on_each(qreg)],
[ops.ry(np.pi * 1.0).on(qreg[0])])
np.random.seed(42)
stretch = 2
base_noise = 0.001
noises = np.random.normal(loc=0.0,
scale=np.sqrt((stretch - 1) * base_noise),
size=(4, ))
np.random.seed(42)
scaled = scale_parameters(circ,
scale_factor=stretch,
sigma=base_noise,
seed=42)
result = []
for moment in scaled:
for op in moment.operations:
gate = deepcopy(op.gate)
param = gate.exponent
result.append(param * np.pi - np.pi)
assert np.all(np.isclose(result - noises, 0))
def test_identity_scale_2q():
"""Tests that when scale factor = 1, the circuit is the
same.
"""
qreg = LineQubit.range(2)
circ = Circuit([ops.CNOT.on(qreg[0], qreg[1])])
scaled = scale_parameters(circ, scale_factor=1, sigma=0.001)
assert _equal(circ, scaled)
def test_identity_scale_1q():
"""Tests that when scale factor = 1, the circuit is the
same.
"""
qreg = LineQubit.range(3)
circ = Circuit([ops.X.on_each(qreg)], [ops.Y.on(qreg[0])])
scaled = scale_parameters(circ, scale_factor=1, sigma=0.001)
assert _equal(circ, scaled)
def test_scale_with_measurement():
"""Tests that we ignore measurement gates.
Test circuit:
0: ───H───T───@───M───
│ │
1: ───H───M───┼───┼───
│ │
2: ───H───────X───M───
"""
qreg = LineQubit.range(3)
circ = Circuit(
[ops.H.on_each(qreg)],
[ops.T.on(qreg[0])],
[ops.measure(qreg[1])],
[ops.CNOT.on(qreg[0], qreg[2])],
[ops.measure(qreg[0], qreg[2])],
)
scaled = scale_parameters(circ, scale_factor=1, sigma=0.001)
assert _equal(circ, scaled)