Bulletin of the American Physical Society
55th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Monday–Friday, June 3–7, 2024; Fort Worth, Texas
Session N05: Frontiers in Cooling and Coherent Control of Ultracold Molecules
8:00 AM–10:00 AM,
Thursday, June 6, 2024
Room: 202AB
Chair: Timur Tscherbul, University of Nevada, Reno, Nevada, 89557, USA
Abstract: N05.00002 : Ultracold RbCs molecules in magic traps and optical tweezers*
8:30 AM–9:00 AM
Presenter:
Simon L Cornish
(Durham University)
Authors:
Simon L Cornish
(Durham University)
Alex Guttridge
(Durham University)
Philip D Gregory
(Durham University)
Kaden R Hazzard
(Rice)
Svetlana Kotochigova
(Temple)
Daniel Ruttley
(Durham University)
Tom R Hepworth
(Durham University)
Luke M Fernley
(Durham University)
Li Tao
(Durham University)
Rosario Gonzalez-Ferez
(Univ de Granada)
Hossein R Sadeghpour
(Harvard - Smithsonian Center for Astrophysics)
In Durham, we study ultracold ground-state RbCs molecules formed by associating Rb and Cs atoms using a combination of magnetoassociation and stimulated Raman adiabatic passage. This talk will report on our development of full quantum control of the molecules. Specifically, we will explain how we have mastered the ac Stark shift due to the trapping light through the development of magic-wavelength traps that allow us to tune the anisotropic polarisability of the molecule to zero. This eliminates trap-induced dephasing on rotational transitions and allows us to generate second-scale rotational coherences that give access to controllable dipole-dipole interactions.
We will also report on new experiments that produce single molecules in an array of optical tweezers starting from a single Rb and a single Cs atom. Using this platform, we prepare the molecules in the lowest hyperfine state of the rovibrational ground state and predominantly in the motional ground state of the trap. We demonstrate site-specific addressing and multi-state readout of single molecules. Using mid-sequence detection of molecule formation errors, we also demonstrate rearrangement of molecules to produce defect-free arrays. Finally, we demonstrate a new hybrid platform that combines single ultracold molecules with single Rydberg atoms, opening a myriad of possibilities.
*This work was supported by the UK Engineering and Physical Sciences Research Council.
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