Raman Sideband Cooling of Molecules in an Optical Tweezer Array to the 3D Motional Ground State,Physical Review X

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Raman Sideband Cooling of Molecules in an Optical Tweezer Array to the 3D Motional Ground State
Physical Review X ( IF 11.6 ) Pub Date : 2024-07-08 , DOI: 10.1103/physrevx.14.031002
Yicheng Bao _{1,

2} , Scarlett S. Yu _{1,

2} , Jiaqi You _{1,

2} , Loïc Anderegg _{1,

2} , Eunmi Chae ₃ , Wolfgang Ketterle _{1,

2} , Kang-Kuen Ni _{1,

1,

2} , John M. Doyle _{1,

2}

Affiliation

Ultracold polar molecules are promising for quantum information processing and searches for physics beyond the standard model. Laser cooling to ultracold temperatures is an established technique for trapped diatomic and triatomic molecules. Further cooling of the molecules to near the motional ground state is crucial for reducing various dephasings in quantum and precision applications. In this work, we demonstrate Raman sideband cooling (RSC) of CaF molecules in optical tweezers to near their motional ground state, with average motional occupation quantum numbers of

{\bar{n}}_{x} = 0.16 (12)

{\bar{n}}_{y} = 0.17 (17)

(radial directions), and

{\bar{n}}_{z} = 0.22 (16)

(axial direction), and a 3-D motional-ground-state probability of

54 \pm 18 %

of the molecules that survive the RSC. This process paves the way to increase molecular coherence times in optical tweezers for robust quantum computation and simulation applications.

中文翻译：

光镊阵列中的分子拉曼边带冷却至 3D 运动基态

超冷极性分子有望用于量子信息处理和超越标准模型的物理探索。激光冷却至超冷温度是捕获双原子和三原子分子的成熟技术。将分子进一步冷却至接近运动基态对于减少量子和精密应用中的各种相移至关重要。在这项工作中，我们演示了光镊中 CaF 分子的拉曼边带冷却 (RSC) 至接近其运动基态，平均运动占据量子数为