论文标题
驱动量子与bose-Einstein冷凝水的原子对相关
Driving Quantum Correlated Atom-Pairs from a Bose-Einstein Condensate
论文作者
论文摘要
将量子气冷却到量子退化领域的能力为极端水平的量子控制打开了可能性。在本文中，我们研究了一种这样的控制方案，该方案证明了通过周期性调节两体S波散射长度的调制，证明了来自Bose-Einstein凝结物中的果酱对的共振扩增。这显示了具有预定动量的选择性扩增量子波动的能力，在该动量可以通过光谱调节动量值。一种具有相同能量但相反动量的颗粒对的经典外部场让人联想到非线性光学中参数放大器晶体中相干驱动的非线性。因此，可以预见，演变将在与调制频率的共振上以准粒子模式下产生挤压物质波状态。 Clark等人最近的实验激发了我们的模型和分析。这观察到了类似于爆炸烟花的飞行时间模式。由于该驱动器是一个高度连贯的过程，因此我们将观察到的烟花模式解释为两体相关幅度的单调生长产生的，因此喷气机应包含具有几乎相等和相对的相关的相关原子对。我们提出了一个潜在的将来的实验，基于应用Ramsey干涉法以实验探测这些对相关性。
The ability to cool quantum gases into the quantum degenerate realm has opened up possibilities for an extreme level of quantum-state control. In this paper, we investigate one such control protocol that demonstrates the resonant amplification of quasimomentum pairs from a Bose-Einstein condensate by the periodic modulation of the two-body s-wave scattering length. This shows a capability to selectively amplify quantum fluctuations with a predetermined momentum, where the momentum value can be spectroscopically tuned. A classical external field that excites pairs of particles with the same energy but opposite momenta is reminiscent of the coherently-driven nonlinearity in a parametric amplifier crystal in nonlinear optics. For this reason, it may be anticipated that the evolution will generate a squeezed matter-wave state in the quasiparticle mode on resonance with the modulation frequency. Our model and analysis is motivated by a recent experiment by Clark et al. that observed a time-of-flight pattern similar to an exploding firework. Since the drive is a highly coherent process, we interpret the observed firework patterns as arising from a monotonic growth in the two-body correlation amplitude, so that the jets should contain correlated atom pairs with nearly equal and opposite momenta. We propose a potential future experiment based on applying Ramsey interferometry to experimentally probe these pair correlations.
