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Rotational Coherence Times of Polar Molecules in Optical Tweezers

https://doi.org/10.1103/PhysRevLett.127.123202

Burchesky, Sean; Anderegg, Loïc; Bao, Yicheng; Yu, Scarlett S.; Chae, Eunmi; Ketterle, Wolfgang; Ni, Kang-Kuen; Doyle, John M. (September 2021, Physical Review Letters)

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Laser cooling of optically trapped molecules

https://doi.org/10.1038/s41567-018-0191-z

Anderegg, Loïc; Augenbraun, Benjamin L.; Bao, Yicheng; Burchesky, Sean; Cheuk, Lawrence W.; Ketterle, Wolfgang; Doyle, John M. (September 2018, Nature Physics)

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$Λ$ -Enhanced Imaging of Molecules in an Optical Trap

https://doi.org/10.1103/PhysRevLett.121.083201

Cheuk, Lawrence W.; Anderegg, Loïc; Augenbraun, Benjamin L.; Bao, Yicheng; Burchesky, Sean; Ketterle, Wolfgang; Doyle, John M. (August 2018, Physical Review Letters)
Observation of microwave shielding of ultracold molecules

https://doi.org/10.1126/science.abg9502

Anderegg, Loïc; Burchesky, Sean; Bao, Yicheng; Yu, Scarlett S.; Karman, Tijs; Chae, Eunmi; Ni, Kang-Kuen; Ketterle, Wolfgang; Doyle, John M. (August 2021, Science)

Harnessing the potential wide-ranging quantum science applications of molecules will require control of their interactions. Here, we used microwave radiation to directly engineer and tune the interaction potentials between ultracold calcium monofluoride (CaF) molecules. By merging two optical tweezers, each containing a single molecule, we probed collisions in three dimensions. The correct combination of microwave frequency and power created an effective repulsive shield, which suppressed the inelastic loss rate by a factor of six, in agreement with theoretical calculations. The demonstrated microwave shielding shows a general route to the creation of long-lived, dense samples of ultracold polar molecules and evaporative cooling.
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