研究领域

目前的研究方向主要集中在镥离子和镱离子的超高精度光钟系统，秒定义和光钟的实际应用，涵盖超稳腔，超稳激光，离子阱、单离子光钟、多离子光钟、可搬运光钟、空间光钟以及芯片光钟等领域。

近年主要学术成果包括：

• 成功地实现了Dicke模型的量子模拟，并首次观测到超震荡辐射量子相变；

• 国际上首次在实验上论证多离子光钟的可行性；

• 首次在实验中建立镥离子光钟并实现镥离子光钟的比对：该光钟的误差每百亿年不超过1秒，截至2024年3月，仍保持原子钟准确度最高记录，离子光钟比对结果最佳记录。

论文成果

• Arnold, K. J., Bustabad, S., Qichen, Q., Zhang, Z.-qiang, Zhao, Q., & Barrett, M. D. (2024). Validating a lutetium frequency reference. arXiv preprint arXiv:2404.16414.

• Zhang, Z.-qiang, Arnold, K., Kaewuam, R. & Barrett, M. ¹⁷⁶Lu⁺ clock comparison at the 10^-18 level via correlation spectroscopy. Science advances 9, eadg1971 (2023).

• Arnold, K., Kaewuam, R., Chanu, S., Tan, T., Zhang, Z.-qiang & Barrett, M. Precision Measurements of the ¹³⁸Ba⁺ 6s²S_1/2-5d²D_5/2 Clock Transition. Phys. Rev. Lett. 124, 193001 (2020).

• Zhang, Z.-qiang, Arnold, K., Arnold, K., Chanu, S., Kaewuam, R., Safronova, M., Safronova, M., Barrett, M. & Barrett, M. Branching fractions for P_3/2 decays in Ba⁺. Physical Review A 101, (2020).

• Chanu, S., Koh, V., Arnold, K., Kaewuam, R., Tan, T., Zhang, Z.-qiang, Safronova, M. & Barrett, M. Magic wavelength of the ¹³⁸Ba⁺ 6s²S_1/2-5d²D_5/2 clock transition. Physical Review A 101, (2020).

• Kaewuam, R., Tan, T., Arnold, K., Chanu, S., Zhang, Z.-qiang & Barrett, M. Hyperfine Averaging by Dynamic Decoupling in a Multi-Ion Lutetium Clock. Physical Review Letters 124, (2020).

• Zhang, Z.-qiang, Arnold, K., Kaewuam, R., Safronova, M. & Barrett, M. Hyperfine-mediated effects in a Lu⁺ optical clock. Physical Review A 102, (2020).

• Kaewuam, R., Tan, T., Zhang, Z.-qiang, Arnold, K., Safronova, M. & Barrett, M. Precision measurement of the ³D₁ and ³D₂ quadrupole moments in Lu⁺. Physical Review A 102, (2020).

• Arnold, K., Chanu, S., Kaewuam, R., Tan, T., Yeo, L., Zhang, Z.-qiang, Safronova, M. & Barrett, M. Measurements of the branching ratios for 6P_1/2 decays in ¹³⁸Ba⁺ . Physical Review A 100, (2019).

• Tan, T., Kaewuam, R., Arnold, K., Chanu, S., Zhang, Z. -qiang, Safronova, M. & Barrett, M. Suppressing Inhomogeneous Broadening in a Lutetium Multi-ion Optical Clock. Physical Review Letters 123, (2019).

• Zhang, Z. -qiang, Lee, C., Kumar, R., Arnold, K., Masson, S., Grimsmo, A., Parkins, A. & Barrett, M. Dicke-model simulation via cavity-assisted Raman transitions. Physical Review A 97, (2018).

• Zhang, Z. -qiang, Lee, C., Kumar, R., Arnold, K., Masson, S., Parkins, A. & Barrett, M. Nonequilibrium phase transition in a spin-1 Dicke model. Optica 4, 424 (2017).