中国物理B ›› 2009, Vol. 18 ›› Issue (6): 2294-2299.doi: 10.1088/1674-1056/18/6/030

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Influence of the virtual photon field on the squeezing properties of atom laser

赵建刚1, 孙长勇2, 文灵华2, 梁宝龙2   

  1. (1)School of Physics Science and Information Technology, Liaocheng University, Liaocheng 252059, China; (2)School of Physics Science and Information Technology,Liaocheng University, Liaocheng 252059, China
  • 收稿日期:2008-12-22 修回日期:2008-12-28 出版日期:2009-06-20 发布日期:2009-06-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No 10847143) and the Natural Science Foundation of Shandong Province (Grant Nos Q2007A01 and Y2008A23).

Influence of the virtual photon field on the squeezing properties of atom laser

Zhao Jian-Gang(赵建刚), Sun Chang-Yong(孙长勇)†, Wen Ling-Hua(文灵华), and Liang Bao-Long(梁宝龙)   

  1. School of Physics Science and Information Technology, Liaocheng University, Liaocheng 252059, China
  • Received:2008-12-22 Revised:2008-12-28 Online:2009-06-20 Published:2009-06-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No 10847143) and the Natural Science Foundation of Shandong Province (Grant Nos Q2007A01 and Y2008A23).

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摘要： This paper investigates the squeezing properties of an atom laser without rotating-wave approximation in the system of a binomial states field interacting with a two-level atomic Bose--Einstein condensate. It discusses the influences of atomic eigenfrequency, the interaction intensity between the optical field and atoms，parameter of the binomial states field and virtual photon field on the squeezing properties. The results show that two quadrature components of an atom laser can be squeezed periodically. The duration and the degree of squeezing an atom laser have something to do with the atomic eigenfrequency and the parameter of the binomial states field, respectively. The collapse and revival frequency of atom laser fluctuation depends on the interaction intensity between the optical field and atoms. The effect of the virtual photon field deepens the depth of squeezing an atom laser.

关键词: quantum optics, Bose--Einstein condensation, atom laser, virtual photon field

Abstract: This paper investigates the squeezing properties of an atom laser without rotating-wave approximation in the system of a binomial states field interacting with a two-level atomic Bose--Einstein condensate. It discusses the influences of atomic eigenfrequency, the interaction intensity between the optical field and atoms，parameter of the binomial states field and virtual photon field on the squeezing properties. The results show that two quadrature components of an atom laser can be squeezed periodically. The duration and the degree of squeezing an atom laser have something to do with the atomic eigenfrequency and the parameter of the binomial states field, respectively. The collapse and revival frequency of atom laser fluctuation depends on the interaction intensity between the optical field and atoms. The effect of the virtual photon field deepens the depth of squeezing an atom laser.

Key words: quantum optics, Bose--Einstein condensation, atom laser, virtual photon field

中图分类号:  (Photoionization and excitation)

  • 32.80.-t
42.50.-p (Quantum optics)