Blue-detuned molecular magneto-optical trap schemes based on Bayesian optimization

authored by: S. Xu, R. Li, Y. Xia, M. Siercke, S. Ospelkaus
Abstract: Direct laser cooling and trapping of molecules to temperature below the Doppler limit and density exceeding 108 are challenging due to the sub-Doppler heating effects of a molecular magneto-optical trap (MOT). In our previous paper [S. Xu, Phys. Rev. Res. 4, L042036 (2022)2643-156410.1103/PhysRevResearch.4.L042036], we presented a general approach to engineering the sub-Doppler force by tuning the AC Stark shift with the addition of a blue-detuned laser. Here, by employing the Bayesian optimization method to optical Bloch equations, we have identified multiple blue-detuned MOT schemes for the CaF molecule. From the three-dimensional Monte Carlo simulation, we obtained a MOT temperature and density of 14 μK and 4.5×108 cm-3, respectively. Our findings present a potential avenue for directly loading molecular MOTs into conservative traps, which can capitalize on the high density and low temperature of the MOTs.
Organisation(s): Institute of Quantum Optics
QuantumFrontiers
External Organisation(s): National Institute of Extremely-Weak Magnetic Field Infrastructure
East China Normal University
Type: Article
Journal: Physical Review A
Volume: 108
ISSN: 2469-9926
Publication date: 05.09.2023
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: Atomic and Molecular Physics, and Optics
Electronic version(s): https://doi.org/10.48550/arXiv.2305.16576 (Access: Open)
https://doi.org/10.1103/PhysRevA.108.033102 (Access: Closed)

BibTeX

@article{65eb1dc7b5154d1b995c5cedec7a7de7,
title = "Blue-detuned molecular magneto-optical trap schemes based on Bayesian optimization",
abstract = "Direct laser cooling and trapping of molecules to temperature below the Doppler limit and density exceeding 108 are challenging due to the sub-Doppler heating effects of a molecular magneto-optical trap (MOT). In our previous paper [S. Xu, Phys. Rev. Res. 4, L042036 (2022)2643-156410.1103/PhysRevResearch.4.L042036], we presented a general approach to engineering the sub-Doppler force by tuning the AC Stark shift with the addition of a blue-detuned laser. Here, by employing the Bayesian optimization method to optical Bloch equations, we have identified multiple blue-detuned MOT schemes for the CaF molecule. From the three-dimensional Monte Carlo simulation, we obtained a MOT temperature and density of 14 μK and 4.5×108 cm-3, respectively. Our findings present a potential avenue for directly loading molecular MOTs into conservative traps, which can capitalize on the high density and low temperature of the MOTs.",
author = "S. Xu and R. Li and Y. Xia and M. Siercke and S. Ospelkaus",
note = "Funding Information: This work was supported by the National Natural Science Foundation of China under Grants No. 11834003 and No. 91836103. M. Siercke and S. Ospelkaus gratefully acknowledge financial support through Germany's Excellence Strategy—EXC-2123/1 QuantumFrontiers. ",
year = "2023",
month = sep,
day = "5",
doi = "10.48550/arXiv.2305.16576",
language = "English",
volume = "108",
journal = "Physical Review A",
issn = "2469-9926",
publisher = "American Physical Society",
number = "3",
}