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Chin. Phys. B, 2013, Vol. 22(7): 074202    DOI: 10.1088/1674-1056/22/7/074202
ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS Prev   Next  

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

Tang Hui-Qina, Li Shao-Xinb, Zhu Kai-Chenga, Tang Yinga, Zheng Xiao-Juana
a School of Physics and Electronics, Central South University, Changsha 410083, China;
b Physical Staff Room, Guangdong Medical College, Dongguan 523808, China
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.
Keywords:  odd Schrödinger cat state      quantum vortex state      coupled waveguide  
Received:  04 October 2012      Revised:  08 November 2012      Published:  01 June 2013
PACS:  42.50.-p (Quantum optics)  
  42.50.Ar  
  42.50.Dv (Quantum state engineering and measurements)  
  03.65.-w (Quantum mechanics)  
Corresponding Authors:  Zhu Kai-Cheng     E-mail:  KCZhu058@csu.edu.cn

Cite this article: 

Tang Hui-Qin, Li Shao-Xin, Zhu Kai-Cheng, Tang Ying, Zheng Xiao-Juan Preparing quantum vortex states with odd Schrödinger cat states through a coupled waveguide system 2013 Chin. Phys. B 22 074202

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