def test_apply_errors(self, gaussian_dev):
"""Test that apply fails for incorrect state preparation"""
with pytest.raises(
ValueError,
match='incorrect size for the number of subsystems'):
p = [thermal_state(0.5)]
gaussian_dev.apply('GaussianState', wires=Wires([0]), par=[p])
with pytest.raises(ValueError, match='Incorrect number of subsystems'):
p = U
gaussian_dev.apply('Interferometer', wires=Wires([0]), par=[p])
with pytest.raises(qml.wires.WireError,
match="Did not find some of the wires"):
p = U2
#dev = DefaultGaussian(wires=4, shots=1000, hbar=hbar)
gaussian_dev.apply('Interferometer',
wires=Wires([0, 1, 2]),
par=[p])
def thermal_state(self, tol):
"""Test the thermal state is correct."""
nbar = 0.5342
means, cov = thermal_state(nbar, hbar=hbar)
assert means == pytest.approx(np.zeros([2]), abs=tol)
assert np.all((cov.diag * 2 / hbar - 1) / 2 == nbar)