Fang Chengyu, Miles Jared, Goldwin Jonathan, Lichtman Martin, Gillette Matthew, Bergdolt Michael, Deshpande Sanket, Norrell Sam A, Huft Preston, Kats Mikhail A, Saffman Mark
Department of Electrical and Computer Engineering, University of Wisconsin-Madison, 1415 Engineering Drive, Madison, WI 53706, USA.
Infleqtion Inc., Madison, WI 53703, USA.
Sci Adv. 2025 Jul 18;11(29):eadw4166. doi: 10.1126/sciadv.adw4166. Epub 2025 Jul 16.
We demonstrate trapping of individual rubidium (Rb) and cesium (Cs) atoms in an interleaved array of bright tweezers and dark bottle-beam traps, using a microfabricated optical element illuminated by a single-laser beam and a 4 system with spatial filtering. Our approach exploits the opposite-sign dynamic polarizabilities of Rb and Cs, ensuring that each species is exclusively trapped in either bright or dark sites. The passive optical mask creates optimal trap depths for both species using three transmittance levels while minimizing the optical phase difference, implemented using a variable-thickness absorbing layer of amorphous germanium. This trapping architecture achieves atom loading rates close to 50% while reducing system complexity compared to conventional methods using active optoelectronic components and/or multiple-laser wavelengths.
我们展示了在明亮光镊和暗瓶束陷阱的交错阵列中捕获单个铷（Rb）原子和铯（Cs）原子的过程，使用了由单激光束照射的微纳加工光学元件和具有空间滤波功能的4系统。我们的方法利用了Rb和Cs相反符号的动态极化率，确保每种原子仅被捕获在亮或暗的位置。无源光学掩膜利用三种透射率水平为两种原子创造了最佳陷阱深度，同时通过使用非晶锗可变厚度吸收层将光学相位差最小化。与使用有源光电子元件和/或多激光波长的传统方法相比，这种捕获架构实现了接近50%的原子加载率，同时降低了系统复杂性。
