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)†
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
Abstract This paper discusses the amplitude-squared squeezing for the superposition of two coherent states with their phase differences being separately /2, 3/2, and , 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 /2 and 3/2, 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.
Received: 06 March 2007
Revised: 05 November 2007
Accepted manuscript online:
PACS:
42.50.Dv
(Quantum state engineering and measurements)
Fund: 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).
Cite this article:
Muhammad Ashfaq Ahmad, Ren Min(任珉), Ma Ai-Qun(马爱群), and Liu Shu-Tian(刘树田) Amplitude-squared squeezing of superposition of coherent states 2008 Chin. Phys. B 17 1777
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