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Exact relation of spin squeezing and phase coherence in a two-mode Bose-Einstein condensates
ZHANG Yuanming,LI Xue,Wang Tenglong,Jin Guangri *
Department of Science, Beijing Jiaotong University, Beijing 100044
*Correspondence author
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Funding: Research Fund for the Doctoral Program of Higher Education of China of China （No.Project No.200800041003）
Opened online:24 February 2012
Accepted by: none
Citation: ZHANG Yuanming,LI Xue,Wang Tenglong.Exact relation of spin squeezing and phase coherence in a two-mode Bose-Einstein condensates[OL]. [24 February 2012] http://en.paper.edu.cn/en_releasepaper/content/4466369
 
 
We investigate spin squeezing of a two-mode boson system with aJosephson coupling. An exact relation between the squeezing and thesingle-particle coherence is discovered, which provides an indirectway to measure the squeezing by readout the coherence in atomicinterference experiments. We prove explicitly that the squeezing isjust along the z axis, indicating the appearance ofnumber-squeezed state. Power laws of the strongest squeezing and theoptimal coupling with particle number N are obtained based upon awide range of numerical simulations.
Keywords:Bose-Einstein condensates; spin squeezing; phase coherence
 
 
 

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