Campbell Gretchen K, Mun Jongchul, Boyd Micah, Streed Erik W, Ketterle Wolfgang, Pritchard David E
MIT-Harvard Center for Ultracold Atoms, Research Laboratory of Electronics, Cambridge, Massachusetts 02139, USA.
Phys Rev Lett. 2006 Jan 20;96(2):020406. doi: 10.1103/PhysRevLett.96.020406. Epub 2006 Jan 19.
We have observed parametric generation and amplification of ultracold atom pairs. A 87Rb Bose-Einstein condensate was loaded into a one-dimensional optical lattice with quasimomentum k0 and spontaneously scattered into two final states with quasimomenta k1 and k2 . Furthermore, when a seed of atoms was first created with quasimomentum k1 we observed parametric amplification of scattered atoms pairs in states k1 and k2 when the phase-matching condition was fulfilled. This process is analogous to optical parametric generation and amplification of photons and could be used to efficiently create entangled pairs of atoms. Furthermore, these results explain the dynamic instability of condensates in moving lattices observed in recent experiments.
我们观测到了超冷原子对的参量产生和放大。一个87Rb玻色 - 爱因斯坦凝聚体被加载到具有准动量k0的一维光学晶格中，并自发散射到具有准动量k1和k2的两个末态。此外，当首先产生具有准动量k1的原子种子时，我们观测到当满足相位匹配条件时，处于k1和k2态的散射原子对的参量放大。这个过程类似于光子的光学参量产生和放大，并且可用于高效地创建纠缠的原子对。此外，这些结果解释了近期实验中观测到的移动晶格中凝聚体的动态不稳定性。
