期刊
PHYSICAL REVIEW A
卷 79, 期 4, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.79.043631
关键词
amplification; Bose-Einstein condensation; magnetisation; paramagnetism; parametric amplifiers; spin fluctuations
资金
- NSF
- David and Lucile Packard Foundation
- OLE Program of DARPA
- LDRD Program of LBNL under Department of Energy [DE-AC02-05CH11231]
- NSERC
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.
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