def test_sigma_10_9_9(self):
""" Test |9><9| for a ten-level system. """
sigma_10_9_9 = np.zeros((10,10))
sigma_10_9_9[9,9] = 1.
sigma_10_9_9 = qu.Qobj(sigma_10_9_9)
self.assertEqual(sigma.sigma(10,9,9), sigma_10_9_9)
def sigma(self, a, b):
""" The transition or 'flip' operator between states |a> and |b>, given
by |a><b|. Uses the sigma_n helper function below this class.
Args:
a: level transitioned from
b: level transitioned to
Returns:
|a><b|
"""
return sigma.sigma(self.num_states, a, b)
def test_sigma_N_2_0_0_0_1(self):
""" Test that sigma_N with 1 subsystem returns same as sigma. """
self.assertEqual(sigma.sigma_N(2,0,0,0,1),sigma.sigma(2,0,0))
def test_sigma_2_0_0(self):
""" Test |0><0| for a two-level system. """
sigma_2_0_0 = qu.Qobj([[1.,0.],[0.,0.]])
self.assertEqual(sigma.sigma(2,0,0), sigma_2_0_0)
