Berry phase in open quantum systems: a quantum Langevin equation approach
Gabriele De Chiara, Artur Lozinski, G. Massimo Palma
Abstract
The evolution of a two level system with a slowly varying Hamiltonian, modeled as s spin 1/2 in a slowly varying magnetic field, and interacting with a quantum environment, modeled as a bath of harmonic oscillators is analyzed using a quantum Langevin approach. This allows to easily obtain the dissipation time and the correction to the Berry phase in the case of an adiabatic cyclic evolution.
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