腔耦合量子点系统的非常规几何量子计算  

Unconventional geometric quantum computation with quantum-dot spin qubits inside a cavity

作　　者：张刚[1] 董萍[2] 

机构地区：[1]皖西学院数理系,安徽六安237012 [2]合肥师范学院物理与电子工程系,安徽合肥230061

出　　处：《量子电子学报》2009年第4期431-436,共6页Chinese Journal of Quantum Electronics

基　　金：国家自然科学基金(60678022;10704001);安徽省教育厅自然科学基金(kj2009A048Z)

摘　　要：提出了在量子点与腔相互作用系统中,利用双拉曼过程来实现非常规几何量子逻辑门方案。在本方案中,所有的演化本身与腔场态无关,因而对热场是不敏感的。在总位相中既包含有几何位相,又包含有动力学位相,但它的确仅依赖于量子态演化的整体几何特征。通过调节耦合常数和失谐量来选择所要的量子控制门,在实际的操作中不需要考虑消除动力学相位问题,因而易于操作,且避免因消除动力学相位引入的误差。A scheme for realizing unconventional geometric quantum logical gates with quantum dots in a microcavity, via double channel Raman interactions, is introduced. In the scheme, all of the operations are independent on the state of cavity mode, and thus insensitive to the thermal cavity field states. The total accumulated phase includes both geometric and dynamic phases, but it still depends only on global features of the process. The required quantum gates can be obtained by adjusting coupling constant and detunings. It＇s relatively easy in implementation by waiving the needs of eliminating dynamic phases, and it can reach higher fidelity by avoiding the additional errors in the process of eliminating dynamic phases.

关 键 词：量子光学 几何量子计算 量子点 拉曼过程 

分 类 号：O431.2[机械工程—光学工程] O562[理学—光学]