4.6 Article

Amplification of fluctuations in a spinor Bose-Einstein condensate

Journal

PHYSICAL REVIEW A
Volume 79, Issue 4, Pages -

Publisher

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.79.043631

Keywords

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

Funding

  1. NSF
  2. David and Lucile Packard Foundation
  3. OLE Program of DARPA
  4. LDRD Program of LBNL under Department of Energy [DE-AC02-05CH11231]
  5. NSERC

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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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