Please login first

Fisher information of Landau states and relative information against the lowest level
Takuya Yamano
1  Kanagawa University


An electron in a constant magnetic field has the energy levels known as the Landau levels.
One can obtain the corresponding radial wave function in cylindrical polar coordinates
(e.g., textbook of Landau & Lifshitz). This system is not explored so far in terms of
information-theoretical point of view. We here focus on Fisher information associated
with these Landau states specified by the two quantum numbers. Fisher information provides
a useful measure of the electronic structure in quantum systems such as hydrogen-like atoms [1,2]
and molecules under Morse potentials [3]. We numerically evaluate the generalized Laguerre
polynomials contained in the radial wave functions. We report that Fisher information increases
linearly with the quantum number n that specifies energy levels, but decreases monotonically
with the quantum number m (i.e., the index of the generalized Laguerre polynomial).

Also, we present relative Fisher information of the Landau states by setting the
lowest Landau state as a reference density. The analytical form is just 4n, which does not
depend on the other quantum number m.


1. T. Yamano, Relative Fisher information of hydrogen-like atoms, Chem. Phys. Lett. 691 (2018) 196
2. T. Yamano, Fisher information of radial wavefunctions for relativistic hydrogenic atoms, Chem. Phys. Lett. 731 (2019) 136618
3. T. Yamano, Relative Fisher information for Morse potential and isotropic quantum oscillators, J. Phys. Commun. 2 (2018) 085018

Keywords: Fisher information; Landau states; generalized Laguerre polynomial
Comments on this paper
Peter Ván
Hi Yamano san,

How do you see the importance of Fisher information in quantum mechanics? On the poster it is seemingly a practical tool. There are arguments that it could be deeply related to the essence of quantisation.

Takuya Yamano
For more detailed explanation
There are vast literature.
Please see the details for this work. Thank you.
T. Yamano, Entropy 2021, 23, 268.