On phase relaxation processes |
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| Authors: | Masashi Ban Fumiaki Shibata Sachiko Kitajima¶ |
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| Affiliation: | 1. Advanced Research Laboratory , Hitachi, Ltd. , Hatoyama, Saitama 350-0395, Japan;2. CREST , Japan Science and Technology Agency , Chuo-ku, Tokyo 103-0028, Japan masashi@activemail.jp;4. Faculty of Science , Department of Physics, Ochanomizu University , Bunkyo-ku, Tokyo 112-8610, Japan |
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| 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. |
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