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 $\pi$/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.
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
Altmetric calculates a score based on the online attention an article receives. Each coloured thread in the circle represents a different type of online attention. The number in the centre is the Altmetric score. Social media and mainstream news media are the main sources that calculate the score. Reference managers such as Mendeley are also tracked but do not contribute to the score. Older articles often score higher because they have had more time to get noticed. To account for this, Altmetric has included the context data for other articles of a similar age.
