On phase relaxation processes

Abstract

Time-evolutions of two-level and multi-level systems in phase relaxation processes are investigated in a systematic way. A general form of the decoherence function which determines phase relaxation of a quantum state is obtained by making use of a microscopic interaction Hamiltonian between the relevant system and reservoir. Furthermore the loss of the phase coherence is described in terms of the Pegg–Barnett phase operator. The decoherence function is explicitly calculated for the stochastic dephasing, the boson detector model and the Coleman–Hepp model.

Notes

¶Present address: Graduate School of Pure and Applied Sciences, University of Tsukuba, Ibaraki 305-8571, Japan

Additional information

Notes on contributors

Sachiko Kitajima¶

¶Present address: Graduate School of Pure and Applied Sciences, University of Tsukuba, Ibaraki 305-8571, Japan