Physics – Quantum Physics
Scientific paper
1999-07-06
Phys.Rev. A60 (1999) 2554
Physics
Quantum Physics
LaTeX file, 5 pages, published version
Scientific paper
10.1103/PhysRevA.60.2554
We find a relationship between unitary transformations of the dynamics of quantum systems with time-dependent Hamiltonians and gauge theories. In particular, we show that the nonrelativistic dynamics of spin-$\frac12$ particles in a magnetic field $B^i (t)$ can be formulated in a natural way as an SU(2) gauge theory, with the magnetic field $B^i(t)$ playing the role of the gauge potential A^i. The present approach can also be applied to systems of n levels with time-dependent potentials, U(n) being the gauge group. This geometric interpretation provides a powerful method to find exact solutions of the Schr\"odinger equation. The root of the present approach rests in the Hermiticity property of the Hamiltonian operators involved. In addition, the relationship with true gauge symmetries of n-level quantum systems is discussed.
Montesinos Merced
Pérez--Lorenzana Abdel
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