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arXiv · 2001.05698

Towards implementation of a magic optical-dipole trap for confining ground-state and Rydberg-state cesium cold atoms

Jiandong Bai·Shuo Liu·Jun He·Junmin Wang
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Abstract

Long ground-Rydberg coherence lifetime is interesting for implementing high-fidelity quantum logic gates, many-body physics, and other quantum information protocols. However, the potential formed by a conventional far-off-resonance red-detuned optical-dipole trap (ODT) is usually repulsive for Rydberg atoms, which will result in fast atom loss and low repetition rate of the experimental sequence. These issues can be addressed by a magic ODT. We performed the calculation of ODT's magic detuning for confinement of cesium ground state and Rydberg state with the same potential well. We used a sum-over-states method to calculate the dynamic polarizabilities of $6S_{1/2}$ ground state and highly-excited ($nS_{1/2}$ and $nP_{3/2}$) Rydberg state of cesium atoms, and identify corresponding magic detuning for optical wavelengths in the range of $850 - 2000$ nm. We estimated the trapping lifetime of cesium Rydberg atoms confined in the magic ODT by including different dissipative mechanisms. Furthermore, we have experimentally realized an 1879.43-nm single-frequency laser system with a watt-level output power for setting up the magic ODT for $6S_{1/2}$ ground-state and $84P_{3/2}$ Rydberg-state cesium cold atoms.

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Jiandong Bai, Shuo Liu, Jun He, Junmin Wang. 2020-01-16. Towards implementation of a magic optical-dipole trap for confining ground-state and Rydberg-state cesium cold atoms. https://doi.org/10.1088/1361-6455/ab91de

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