Bhatt Rohit Prasad, Kilinc Jan, Höcker Lilo, Jendrzejewski Fred
Kirchhoff-Institut für Physik, Universität Heidelberg, Im Neuenheimer Feld 227, 69120, Heidelberg, Germany.
Sci Rep. 2022 Feb 14;12(1):2422. doi: 10.1038/s41598-022-05778-8.
Single particle resolution is a requirement for numerous experimental protocols that emulate the dynamics of small systems in a bath. Here, we accurately resolve through atom counting the stochastic dynamics of a few sodium atoms in presence of a cold potassium cloud. This capability enables us to rule out the effect of inter-species interaction on sodium atom number dynamics, at very low atomic densities present in these experiments. We study the noise sources for sodium and potassium in a common framework. Thereby, we assign the detection limits to 4.3 atoms for potassium and 0.2 atoms (corresponding to 96% fidelity) for sodium. This opens possibilities for future experiments with a few atoms immersed in a quantum degenerate gas.
单粒子分辨率是许多模拟浴中小系统动力学的实验方案所必需的。在这里，我们通过原子计数精确解析了在冷钾云存在下几个钠原子的随机动力学。这种能力使我们能够在这些实验中非常低的原子密度下排除种间相互作用对钠原子数动力学的影响。我们在一个通用框架中研究钠和钾的噪声源。由此，我们将钾的检测限设定为4.3个原子，钠的检测限设定为0.2个原子（对应96%的保真度）。这为未来将几个原子浸没在量子简并气体中的实验开辟了可能性。
