Performance of a two-state quantum engine improved by the superposition effect

作     者：OU CongJie HUANG ZhiFu LIN BiHong CHEN JinCan 

作者机构：College of Information Science and EngineeringHuaqiao University Department of PhysicsXiamen University 

出 版 物：《Science China(Physics,Mechanics & Astronomy)》 (中国科学：物理学、力学、天文学（英文版）)

年 卷 期：2013年第56卷第10期

页      面：1815-1821页

核心收录：

学科分类：080703[工学-动力机械及工程] 07[理学] 08[工学] 0807[工学-动力工程及工程热物理] 070201[理学-理论物理] 0702[理学-物理学] 

基　　金：supported by the National Natural Science Foundation of China(Grant No.11005041) the Program for Prominent Young Talents in Fujian Province University(Grant No.JA12001) the Natural Science Foundation of Fujian Province(Grant Nos.2010J05007 and 2011J01012) the Fundamental Research Funds for the Central Universities(Grant No.JB-SJ1005) the Science Research Fund of Huaqiao University(Grant No.09BS510) 

主　　题：quantum engine superposition effect generalized potential 

摘      要：The performance of a two-state quantum engine under different conditions is analyzed. It is shown that the efficiency of the quantum engine can be enhanced by superposing the eigenstates at the beginning of the cycle. By employing the finite-time movement of the potential wall, the power output of the quantum engine as well as the efficiency at the maximum power out- put （EMP） can be obtained. A generalized potential is adopted to describe a class of two-level quantum engines in a unified way. The results obtained show clearly that the performances of these engines depend on the external potential, the geometric configuration of the quantum engines, and the superposition effect. Moreow^r, it is found that the superposition effect will en- large the optimally operating region of quantum engines.