中国物理B ›› 2008, Vol. 17 ›› Issue (5): 1777-1783.doi: 10.1088/1674-1056/17/5/038

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Amplitude-squared squeezing of superposition of coherent states

刘树田1, Muhammad Ashfaq Ahmad2, 马爱群3, 任 珉4   

  1. (1)Department of Physics, Harbin Institute of Technology, Harbin 150001, China; (2)Department of Physics, Harbin Institute of Technology, Harbin 150001, China;Department of Physics, COMSATS Institute of Information Technology, Lahore 54000, Pakistan; (3)Department of Physics, Harbin Institute of Technology, Harbin 150001, China;Physics Science and Technology School, Heilongjiang University, Harbin 150080, China;City Construction College, Guangzhou University, Guangzhou 510900, China; (4)Earthquake Engineering Research and Test Centre, Guangzhou University, Guangzhou 510405, China
  • 收稿日期:2007-03-06 修回日期:2007-11-05 出版日期:2008-05-20 发布日期:2008-05-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos 10674038 and 10604042) and National Basic Research Program of China (Grant No 2006CB302901).

Amplitude-squared squeezing of superposition of coherent states

Muhammad Ashfaq Ahmada)b), Ren Min(任珉)c), Ma Ai-Qun(马爱群)a)d)e), and Liu Shu-Tian(刘树田)a)†   

  1. a Department of Physics, Harbin Institute of Technology, Harbin 150001, China; b Department of Physics, COMSATS Institute of Information Technology, Lahore 54000, Pakistan; c  Earthquake Engineering Research and Test Centre, Guangzhou University, Guangzhou 510405, China; d Physics Science and Technology School, Heilongjiang University, Harbin 150080, China; e City Construction College, Guangzhou University, Guangzhou 510900, China
  • Received:2007-03-06 Revised:2007-11-05 Online:2008-05-20 Published:2008-05-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos 10674038 and 10604042) and National Basic Research Program of China (Grant No 2006CB302901).

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摘要： This paper discusses the amplitude-squared squeezing for the superposition of two coherent states with their phase differences being separately π/2, 3π/2, and π, as well as for the superposition state of two pseudoclassical states. According to the analysis, it is found that the superposition state of two coherent states with their phase differences π/2 and 3π/2, and the superposition state of two pseudoclassical states both do exhibit the amplitude-squared squeezing. Also, some specific states are found to exhibit even stronger squeezing effects when relative phase of the superposition is equal to the average photon number. Amplitude-squared squeezing is dependent on the difference in phase between two coherent states.

关键词: nonclassical states, superposition of two coherent states, amplitude-squared squeezing

Abstract: This paper discusses the amplitude-squared squeezing for the superposition of two coherent states with their phase differences being separately $\pi$/2, 3$\pi$/2, and $\pi$, as well as for the superposition state of two pseudoclassical states. According to the analysis, it is found that the superposition state of two coherent states with their phase differences $\pi$/2 and 3$\pi$/2, and the superposition state of two pseudoclassical states both do exhibit the amplitude-squared squeezing. Also, some specific states are found to exhibit even stronger squeezing effects when relative phase of the superposition is equal to the average photon number. Amplitude-squared squeezing is dependent on the difference in phase between two coherent states.

Key words: nonclassical states, superposition of two coherent states, amplitude-squared squeezing

中图分类号:  (Quantum state engineering and measurements)

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