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

doi:10.1088/1674-1056/22/7/074202

中国物理B ›› 2013, Vol. 22 ›› Issue (7): 74202-074202.doi: 10.1088/1674-1056/22/7/074202

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇下一篇

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

唐慧琴^a, 李绍新^b, 朱开成^a, 唐英^a, 郑小娟^a

a School of Physics and Electronics, Central South University, Changsha 410083, China;
b Physical Staff Room, Guangdong Medical College, Dongguan 523808, China

收稿日期:2012-10-04 修回日期:2012-11-08 出版日期:2013-06-01 发布日期:2013-06-01

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

Tang Hui-Qin (唐慧琴)^a, Li Shao-Xin (李绍新)^b, Zhu Kai-Cheng (朱开成)^a, Tang Ying (唐英)^a, Zheng Xiao-Juan (郑小娟)^a

a School of Physics and Electronics, Central South University, Changsha 410083, China;
b Physical Staff Room, Guangdong Medical College, Dongguan 523808, China

Received:2012-10-04 Revised:2012-11-08 Online:2013-06-01 Published:2013-06-01
Contact: Zhu Kai-Cheng E-mail:KCZhu058@csu.edu.cn

摘要/Abstract

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 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 Schrö, dinger cat state, quantum vortex state, coupled waveguide

Abstract: 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 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.

Key words: odd Schrödinger cat state, quantum vortex state, coupled waveguide

中图分类号: (Quantum optics)

42.50.-p

42.50.Dv (Quantum state engineering and measurements) 03.65.-w (Quantum mechanics)

唐慧琴, 李绍新, 朱开成, 唐英, 郑小娟. Preparing quantum vortex states with odd Schrödinger cat states through a coupled waveguide system[J]. 中国物理B, 2013, 22(7): 74202-074202.

Tang Hui-Qin (唐慧琴), Li Shao-Xin (李绍新), Zhu Kai-Cheng (朱开成), Tang Ying (唐英), Zheng Xiao-Juan (郑小娟). Preparing quantum vortex states with odd Schrödinger cat states through a coupled waveguide system[J]. Chin. Phys. B, 2013, 22(7): 74202-074202.

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

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

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