spheres.stars.pure.spin_xyz¶
-
spheres.stars.pure.spin_xyz(spin)[source]¶ Takes a spin-j state and returns the cartesian coordinates on the unit sphere corresponding to its “Majorana stars.” Each contributes a quantum of angular momentum \(\frac{1}{2}\) to the overall spin.
Note: If given a spin-0 state, returns [[0,0,0]]. If given a state with 0 norm, returns a list of 2j 0-vectors.
- Parameters
spin (qt.Qobj) – Spin-j state.
- Returns
xyz – A array with shape (2j, 3) containing the 2j cartesian coordinates of the stars.
- Return type
np.ndarray