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Bulletin of the American Physical Society

Grey-molasses based optical-tweezer loading: Controlling collisions for scaling up atom-array assembly

Mark O. Brown, Tobias Thiele, Christopher Kiehl, Ting‐Wei Hsu, Cindy A. Regal

Published May 28, 2019• 0 citations
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We show that with a purely blue-detuned cooling mechanism we can densely load single neutral atoms into large arrays of shallow optical tweezers. With this ability, more efficient assembly of larger ordered arrays will be possible - hence expanding the number of particles available for bottom-up quantum simulation and computation with atoms. Using Lambda-enhanced grey molasses on the D1 line of 87Rb, we achieve loading into a single 0.63 mK trap with 89% probability, and we further extend this loading to 100 atoms at 80% probability. The loading behavior agrees with a model of consecutive light-assisted collisions in repulsive molecular states. With simple rearrangement that only moves rows and columns of a 2D array, we demonstrate one example of the power of enhanced loading in large arrays.

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From two-atom interference to BEC: Scaling atom arrays in optical tweezers (Conference Presentation)

Tobias Thiele, Cindy A. Regal

In this talk, I will discuss our pathway toward quantum simulations and computation with neutral atoms in arrays of optical tweezers cooled to their motional ground state. Initially, I will talk about two-atom interference experiments, e.g. the atomic analog to the Hong-Ou-Mandel effect, and how we create spin entangled states. I will then talk about how we scale our system to accommodate 80 single atoms, loaded into 100 traps while maintaining full single-atom control. For this efficient loading process, we control atomic collisions in the tweezers using grey molasses. When combined with ground-state cooling and atom-rearranging, this should allow us to form a micro-BEC with controlled atom number and entropy.

•Mar 10, 2020•0 citations
We show that with a purely blue-detuned cooling mechanism we can densely load single neutral atoms into large arrays of shallow optical tweezers. With this ability, more efficient assembly of larger ordered arrays will be possible - hence expanding the number of particles available for bottom-up quantum simulation and computation with atoms. Using Lambda-enhanced grey molasses on the D1 line of 87Rb, we achieve loading into a single 0.63 mK trap with 89% probability, and we further extend this loading to 100 atoms at 80% probability. The loading behavior agrees with a model of consecutive light-assisted collisions in repulsive molecular states. With simple rearrangement that only moves rows and columns of a 2D array, we demonstrate one example of the power of enhanced loading in large arrays.
In this talk, I will discuss our pathway toward quantum simulations and computation with neutral atoms in arrays of optical tweezers cooled to their motional ground state. Initially, I will talk about two-atom interference experiments, e.g. the atomic analog to the Hong-Ou-Mandel effect, and how we create spin entangled states. I will then talk about how we scale our system to accommodate 80 single atoms, loaded into 100 traps while maintaining full single-atom control. For this efficient loading process, we control atomic collisions in the tweezers using grey molasses. When combined with ground-state cooling and atom-rearranging, this should allow us to form a micro-BEC with controlled atom number and entropy.