Preparing quantum vortex states with odd Schrdinger cat states through a coupled waveguide system  

作　　者：唐慧琴 李绍新 朱开成 唐英 郑小娟 

机构地区：[1]School of Physics and Electronics,Central South University [2]Physical Staff Room,Guangdong Medical College

出　　处：《Chinese Physics B》2013年第7期197-201,共5页中国物理B（英文版）

摘　　要：A scheme is proposed for preparing a quantum vortex state with a coupled waveguide, in which a single-mode odd cat state with weak intensity and a single-mode coherent state are inserted in the input ports, respectively. The analytical wavefunction of the resulting state in the quadrature space is derived, and the vortex structure of the output state is analyzed. It is found that the obtained states, which may carry a vortex with topological charge index one, are entangled and nonclassical, depending only on the scaled propagation time and the weak intensity of the input odd cat state instead of the displacement parameter of the input coherent state. The phase distribution, however, in the quadrature space, depends on the displacement parameter of the input coherent stateA scheme is proposed for preparing a quantum vortex state with a coupled waveguide, in which a single-mode odd cat state with weak intensity and a single-mode coherent state are inserted in the input ports, respectively. The analytical wavefunction of the resulting state in the quadrature space is derived, and the vortex structure of the output state is analyzed. It is found that the obtained states, which may carry a vortex with topological charge index one, are entangled and nonclassical, depending only on the scaled propagation time and the weak intensity of the input odd cat state instead of the displacement parameter of the input coherent state. The phase distribution, however, in the quadrature space, depends on the displacement parameter of the input coherent state

关 键 词：odd Schro¨dinger cat state quantum vortex state coupled waveguide 

分 类 号：O413[理学—理论物理]