%0 Journal Article
%T Two-electron InAs quantum-dot-molecular qubit modulated by the orientation of magnetic fields<br>磁场方向调制的InAs量子点分子量子比特
%A Dong Qing-Rui
%A <br>董庆瑞
%J 物理学报
%D 2007
%I 
%X The electronic structure of a two-electron quantum-dot molecular has studied using the effective mass approximation. The quantum-dot molecular consists of two vertically coupled self-assembled quantum disks in a magnetic field with varying orientation. Based on the calculation, a qubit modulated by the orientation of magnetic field is proposed with the total spin of the system. Electron correlations may lead to the switching of the total spin between S=0 and S=1 states. The switching is realized not by the changing strength but by the changing orientation of an external magnetic field. Our results provide a possibility to use the total spin of the system as a qubit modulated by varying the orientation of the magnetic field. Since high-quality vertically stacked quantum disks can be fabricated successfully, it is realistic to obtain qubits of this type.
%K quantum dot molecular
%K modulated by the orientation of magnetic fields
%K qubit<br>量子点分子
%K 磁场方向调制
%K 量子比特
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=47EA7CFDDEBB28E0&jid=29DF2CB55EF687E7EFA80DFD4B978260&aid=85FDD3FD81CCE313&yid=A732AF04DDA03BB3&vid=014B591DF029732F&iid=9CF7A0430CBB2DFD&sid=11AE2C1308ACCD7C&eid=3F0B03FF2A66502E&journal_id=1000-3290&journal_name=物理学报&referenced_num=0&reference_num=20