Laboratoire Kastler-Brossel, ENS, Université Pierre et Marie Curie-Paris 6, CNRS, 24 rue Lhomond, 75 231 Paris Cedex 05, France.
Phys Rev Lett. 2010 Aug 20;105(8):080403. doi: 10.1103/PhysRevLett.105.080403. Epub 2010 Aug 19.
We measure atom number statistics after splitting a gas of ultracold 87Rb atoms in a purely magnetic double-well potential created on an atom chip. Well below the critical temperature for Bose-Einstein condensation Tc, we observe reduced fluctuations down to -4.9 dB below the atom shot noise level. Fluctuations rise to more than +3.8 dB close to Tc, before reaching the shot noise level for higher temperatures. We use two-mode and classical field simulations to model these results. This allows us to confirm that the supershot noise fluctuations directly originate from quantum statistics.
我们在原子芯片上产生的纯磁场双阱势中分裂超冷 87Rb 原子气体后，测量原子数统计。在远低于玻色-爱因斯坦凝聚临界温度 Tc 的情况下，我们观察到波动幅度降低到低于原子散粒噪声水平 -4.9 dB。在接近 Tc 时，波动幅度上升到超过 +3.8 dB，然后在更高温度下达到散粒噪声水平。我们使用双模和经典场模拟来模拟这些结果。这使我们能够确认超散粒噪声波动直接源自量子统计。
