TY  - JOUR
AU  - Blanes, S.
AU  - Casas, F.
AU  - Oteo, J. A.
AU  - Ros, J.
PY  - 2010
DA  - 2010//
TI  - A pedagogical approach to the Magnus expansion
T2  - Eur. J. Phys.
JO  - European Journal of Physics
SP  - 907
EP  - 918
VL  - 31
IS  - 4
PB  - Iop Publishing Ltd
AB  - Time-dependent perturbation theory as a tool to compute approximate solutions of the Schrodinger equation does not preserve unitarity. Here we present, in a simple way, how the Magnus expansion (also known as exponential perturbation theory) provides such unitary approximate solutions. The purpose is to illustrate the importance and consequences of such a property. We suggest that the Magnus expansion may be introduced to students in advanced courses of quantum mechanics.
SN  - 0143-0807
UR  - https://doi.org/10.1088/0143-0807/31/4/020
DO  - 10.1088/0143-0807/31/4/020
LA  - English
N1  - ISI:000279393800024
ID  - Blanes_etal2010
ER  -