Geometric phases in qubit-oscillator system beyond conventional rotating-wave approximation  

作　　者：王月明 杜冠 梁九卿 

机构地区：[1]Department of Physics,Institute of Theoretical Physics,Shanxi University,Taiyuan 030006,China [2]State Key Laboratory of Quantum Optics and Quantum Optics Devices,Shanxi University,Taiyuan 030006,China

出　　处：《Chinese Physics B》2012年第4期319-323,共5页中国物理B（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant Nos. 11075099, 11047167, and 11105087);the Programme of State Key Laboratory of Quantum Optics and Quantum Optics Devices (Grant No. KF201002);the National Fundamental Fund of Personnel Training (Grant No. J1103210);the Youth Science Foundation of Shanxi Province of China (Grant No. 2010021003-2)

摘　　要：In this work we investigated the geometric phases of a qubit-oscillator system beyond the conventional rotating- wave approximation. We find that in the limiting of weak coupling the results coincide with that obtained under rotating-wave approximation while there exists an increasing difference with the increase of coupling constant. It was shown that the geometric phase is symmetric with respect to the sign of the detuning of the quantized field from the one-photon resonance under the conventional rotating-wave approximation while a red-blue detuning asymmetry occurs beyond the conventional rotating-wave approximation.In this work we investigated the geometric phases of a qubit-oscillator system beyond the conventional rotating- wave approximation. We find that in the limiting of weak coupling the results coincide with that obtained under rotating-wave approximation while there exists an increasing difference with the increase of coupling constant. It was shown that the geometric phase is symmetric with respect to the sign of the detuning of the quantized field from the one-photon resonance under the conventional rotating-wave approximation while a red-blue detuning asymmetry occurs beyond the conventional rotating-wave approximation.

关 键 词：geometric phase rotating-wave approximation red-blue detuning asymmetry 

分 类 号：O413.1[理学—理论物理]