Gray-Molasses Optical-Tweezer Loading: Controlling Collisions for Scaling Atom-Array Assembly
Gray-Molasses Optical-Tweezer Loading: Controlling Collisions for Scaling Atom-Array Assembly
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DOI：
10.1103/physrevx.9.011057
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发表时间：
2019-03-29
影响因子：
12.5
通讯作者：
Regal, C. A.
中科院分区：
文献类型：
--
作者：
Brown, M. O.;Thiele, T.;Regal, C. A.
为了在微阱中分离单个中性原子，实验者长期以来利用分子光缔合使原子分布亚泊松。虽然各种方法都使用了吸引（红失谐）和排斥（蓝失谐）分子状态的组合，但迄今为止，所有实验都是基于红失谐冷却。在我们的工作中，我们提出了一个转移的角度来看，即捕获单个原子的有效方法是在加载阶段消除红失谐光，并使用蓝失谐光，既冷却原子，并通过在光缔合过程中原子-原子碰撞释放的能量精确控制陷阱损失。随后应用的红失谐光，然后确保准备的最大一个原子的陷阱。利用A-增强的灰糖蜜作为负载，我们研究和模拟了分子过程，发现即使在很浅的光镊中，我们也能以90%的概率捕获单个原子。使用100个陷阱加载80%的概率，我们展示了一个例子，通过组装一个网格的36个原子，只使用一个单一的移动的行和列在二维增强加载的力量。我们的洞察力是在自下而上的量子模拟和原子甚至分子计算中缩放粒子数量的关键。
To isolate individual neutral atoms in microtraps, experimenters have long harnessed molecular photoassociation to make atom distributions sub-Poissonian. While a variety of approaches have used a combination of attractive (red-detuned) and repulsive (blue-detuned) molecular states, to date all experiments have been predicated on red-detuned cooling. In our work, we present a shifted perspective-namely, the efficient way to capture single atoms is to eliminate red-detuned light in the loading stage and use blue-detuned light that both cools the atoms and precisely controls trap loss through the amount of energy released during atom-atom collisions in the photoassociation process. Subsequent application of reddetuned light then assures the preparation of maximally one atom in the trap. Using A-enhanced gray-molasses for loading, we study and model the molecular processes and find we can trap single atoms with 90% probability even in a very shallow optical tweezer. Using 100 traps loaded with 80% probability, we demonstrate one example of the power of enhanced loading by assembling a grid of 36 atoms using only a single move of rows and columns in 2D. Our insight is key in scaling the number of particles in a bottom-up quantum simulation and computation with atoms, or even molecules.