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Nonclassical Characteristics of Quantun Light Field Interacting with Bose-Einstein Condendate

Zhao Zhi

Published Jan 1, 2000• 0 citations
OpenAlex

Abstract

In this paper,nonclassical effects of quantum lightfield interacting with Bose- Einstien condensate (BEC) are investigated when the quantum lightfield is initially in a coherentstate and the atomic field of the BEC is initially in a number state.It is shown that the quantum light field exhibits sub- Poinssonian photon statistics in the time evolution butthere is no second- order squeezing of the quadrture components of the light field in the wholedynamic evolution.Itisfound thatundersuitable conditions,thehight- ordersqueezing of the lightfield can occur.Concretely ,the fourth order squeezing of the lightfield iis studied in detail.

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In this paper,nonclassical effects of quantum lightfield interacting with Bose- Einstien condensate (BEC) are investigated when the quantum lightfield is initially in a coherentstate and the atomic field of the BEC is initially in a number state.It is shown that the quantum light field exhibits sub- Poinssonian photon statistics in the time evolution butthere is no second- order squeezing of the quadrture components of the light field in the wholedynamic evolution.Itisfound thatundersuitable conditions,thehight- ordersqueezing of the lightfield can occur.Concretely ,the fourth order squeezing of the lightfield iis studied in detail.
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We have investigated quantum statistical behaviors of photons and atoms in interaction of an atomic Bose Einstein condensate with quantized laser field. When the quantized laser field is initially prepared in a superposition state which exhibits holes in its photon-number distribution, while the atomic field is initially in a Fock state, it is found that there is energy exchange between photons and atoms. For the input and output states, the photons and atoms may exhibit the sub-Poissonian distribution. The input and output laser fields may exhibit quadrature squeezing, but for the atomic field, only the output state exhibits quadrature squeezing. It is shown that there exists the violation of the Cauchy-Schwartz inequality, which means that the correlation between photons and atoms is nonclassical.``
When neglecting and considering the interaction between atoms,the quadrature squeezing and the photon-number squeezing of Bose-Einstein Condensate of V-type three level atoms interacting with two-mode squeezed light field are studied.The results show that the quadrature squeezing dependent on squeezing parameter and the photon-number squeezing is closely correlated to squeezing parameter and light field intensity.It is found that the two kinds of squeezing can be obtained at some conditions.and the interaction between atoms in BEC changes the period of fluctuation of light field and the amplitude of fluctuation of quadrature component.However,such atom-atom interaction does not affect the amplitude of fluctuation of photon-number squeezing.
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We consider the model of a weakly driven optical cavity containing two clouds of atomic Bose–Einstein condensates (BECs). Nonclassical photon correlations and correlations between the two atomic BECs are investigated under different cavity conditions including strong atom-field coupling and bad cavity regime. We show that the nonlinear interatom collisional interactions in BEC leads to a significant loss of cavity light coherence. Various types of nonclassical properties are investigated such as sub-Poissonian statistics, antibunching and entanglement. We show that the entanglement can be generated between BECs and the cavity field. The time evolution of entanglement is also numerically studied.