Quantum-fluctuation-driven coherent spin dynamics in small condensates

被引：22

作者：

Cui, Xiaoling ^{[1
,2
]}

Wang, Yupeng ^{[1
]}

Zhou, Fei ^{[2
]}

机构：

[1] Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China

[2] Univ British Columbia, Dept Phys & Astron, Vancouver, BC V6T 1Z1, Canada

来源：

PHYSICAL REVIEW A | 2008年 / 78卷 / 05期

基金：

加拿大自然科学与工程研究理事会;

关键词：

D O I：

10.1103/PhysRevA.78.050701

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We have studied the quantum spin dynamics of small condensates of cold sodium atoms. For a condensate initially prepared in a mean-field ground state, we show that coherent spin dynamics is purely driven by quantum fluctuations of collective spin coordinates and can be tuned by quadratic Zeeman coupling and magnetization. This dynamics in small condensates can be probed in a high-finesse optical cavity where the temporal behaviors of the excitation spectra of a coupled condensate-photon system reveal the time evolution of populations of atoms at different hyperfine spin states.

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