Effect of decoherence on the Berry phase of a spin-half in a rotating magnetic field
1 Department of Physics and State Key Laboratory of Surface Physics, Fudan University - Shanghai, 200433, China
2 Faculty of Science, Kunming University of Science and Technology - Kunming 650093, China
Received: 12 March 2013
Accepted: 19 July 2013
We investigate the decoherence effect of a bosonic bath on the Berry phase of a spin- in a time-dependent magnetic field, without making the Markovian approximation. A two-cycle process resulting in a pure Berry phase is considered. The low-frequency quantum noise significantly affects the Berry phase. In the adiabatic limit, the high-frequency quantum noise only has a small effect. The result is also valid in some more general situations.
PACS: 03.65.Yz – Decoherence; open systems; quantum statistical methods / 03.65.Vf – Phases: geometric; dynamic or topological / 03.67.Pp – Quantum error correction and other methods for protection against decoherence
© EPLA, 2013