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Poster Session

Poster Session II

4:00 pm – 6:00 pm, Wednesday June 18 Session H00 Oregon Convention Center, Exhibit Hall E
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Narrow-line-mediated Sisyphus cooling in the 3P2 metastable state of strontium

Poster 132
Presenter: Ryoto Takeuchi (The University of Tokyo)
Authors: Chun-Chia Chen (Institute of Atomic and Molecular Sciences), Shoichi Okaba (The University of Tokyo), Hidetoshi Katori (Univ of Tokyo)

The 1S0 – 3P0 clock transition in alkaline-earth(-like) atoms underpins state-of-the-art optical lattice clocks, atom interferometers, and quantum computing platforms. The continuous operation of these devices, which enhances clock and interferometer stability and enables uninterrupted qubit loading, requires a steady cold atom source compatible with coherent operation in the clock transition.

To address this challenge, we have developed a two-stage cooling and atom guiding scheme. Strontium atoms are first cooled on the 1S0 – 1P1 transition and subsequently optically pumped into the long-lived 3P2 state for magnetic trapping. Narrow-line Doppler cooling on the 3P2 - 3D3 transition further cools the atoms to a few tens of μK, allowing efficient loading into a moving optical lattice that transports them away from the cooling light.

Here, we demonstrate efficient atom loading into the moving lattice by incorporating a Sisyphus potential in the 3D3 state. This additional cooling mechanism enhances the narrow-line Doppler cooling, leading to a twofold increase in the atom flux transported by the moving lattice. This advancement represents a crucial step toward next-generation quantum devices with continuous operation.

Funding acknowledgement

This work was supported by the Japan Science and Technology Agency (JST) Mirai Program Grant No. JP-MJMI18A1.

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