A compact and fast radio-frequency source for efficient Raman sideband cooling

Liren Pang; Zhiyu Ma; Biao Wang; Rui Gong; Songquan Wei; Hongli Liu; Wenhao Yuan; Ke Deng; Jie Zhang; Zehuang Lu

doi:10.1063/5.0235305

A compact and fast radio-frequency source for efficient Raman sideband cooling

Rev Sci Instrum. 2024 Dec 1;95(12):123202. doi: 10.1063/5.0235305.

Authors

Liren Pang¹, Zhiyu Ma¹, Biao Wang¹, Rui Gong¹, Songquan Wei¹, Hongli Liu¹, Wenhao Yuan¹, Ke Deng¹, Jie Zhang¹, Zehuang Lu¹

Affiliation

¹ MOE Key Laboratory of Fundamental Physical Quantities Measurement, Hubei Key Laboratory of Gravitation and Quantum Physics, PGMF and School of Physics, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074, People's Republic of China.

PMID: 39737517
DOI: 10.1063/5.0235305

Abstract

A compact and fast radio-frequency (RF) source developed for Raman sideband cooling (RSBC) in trapped ion and cold atom experiments is presented. The source is based on direct digital synthesizer, advanced real-time infrastructure for quantum physics, and field programmable gate array. The source has a frequency switching speed of 40 ns and can output continuous μs-level time sequences for RSBC. The maximum output frequency of the source is 1.4 GHz. The RF source is capable of pre-writing data for eight channels. As a demonstration, the RF source is applied to our 25Mg+-27Al+ ion pair optical clock experiment. In order to cool down the ion pair to the vibrational ground state, two-order RSBC is applied to the 25Mg+ ion. As a result, the ion pair motions in the three X, Y, and Z directions are all cooled to the vibrational ground state efficiently, demonstrating the feasibility of this technique. The developed RF source can be widely implemented for other cold atom experiments.