|Title||Microscopic Control and Detection of Ultracold Strontium in Optical-Tweezer Arrays|
|Publication Type||Journal Article|
|Year of Publication||2018|
|Authors||Norcia, MA, Young, AW, Kaufman, AM|
|Journal||Physical Review X|
|Keywords||laser cooling, optical tweezers, quantum simulation|
Optical tweezers provide a versatile platform for the manipulation and detection of single atoms. Here, we use optical tweezers to demonstrate a set of tools for the microscopic control of atomic strontium, which has two valence electrons. Compared to the single-valence-electron atoms typically used with tweezers, strontium has a more complex internal state structure with a variety of transition wavelengths and linewidths. We report single-atom loading into an array of subwavelength scale optical tweezers and light-shift-free control of a narrow-linewidth optical transition. We use this transition to perform three-dimensional ground-state cooling and to enable high-fidelity nondestructive imaging of single atoms on subwavelength spatial scales. These capabilities, combined with the rich internal structure of strontium, open new possibilities including tweezer-based metrology, new quantum computing architectures, and new paths to low-entropy many-body physics.