Amplification of fluctuations in a spinor Bose-Einstein condensate

被引：114

作者：

Leslie, S. R. ^{[1
]}

Guzman, J. ^{[1
,2
]}

Vengalattore, M. ^{[1
]}

Sau, Jay D. ^{[1
]}

Cohen, Marvin L. ^{[1
,2
]}

Stamper-Kurn, D. M. ^{[1
,2
]}

机构：

[1] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA

[2] Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA

来源：

PHYSICAL REVIEW A | 2009年 / 79卷 / 04期

基金：

加拿大自然科学与工程研究理事会;

关键词：

amplification; Bose-Einstein condensation; magnetisation; paramagnetism; parametric amplifiers; spin fluctuations;

D O I：

10.1103/PhysRevA.79.043631

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Dynamical instabilities in a Rb-87 F=1 spinor Bose-Einstein condensate are used as a parametric amplifier of quantum spin fluctuations. We demonstrate the spectrum of this amplifier to be tunable, in quantitative agreement with theory. We quantify the microscopic spin fluctuations of the initially paramagnetic condensate by applying this amplifier and measuring the resulting macroscopic magnetization. The variance of these fluctuations agrees with predictions of a beyond-mean-field theory. This spin amplifier is thus shown to be nearly quantum limited at a gain as high as 30 dB.

引用

页数：5

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