Murray Barrett Group
The development of stable and accurate time standards has historically been an important driver of both fundamental science and applied technologies. Recent years have seen phenomenal progress in atomic clocks based on optical transitions such that several systems now exceed state-of-the-art cesium fountain clocks. Our group is investigating singly-ionized lutetium as a potential clock candidate. This ion has a very unique atomic structure supporting a total of three clock transitions with extremely low sensitivities to external electromagnetic fields. A fortuitous property of one transition allows micromotion-induced shifts from the trapping fields to be exactly cancelled making it a prime candidate for a multi-ion clock. Moving from the usual single-ion clock to the many ion arena will eliminate the stability bottleneck facing all other ion-based clocks today and open the possibility of applying quantum logic techniques to enhance clock stability.
More information at our homepage: https://qmetrology.quantumlah.org/
Associate Professor
Department of Physics, Faculty of Science, National University of Singapore
Group Members
- Murray BarrettPrincipal Investigator
- Kyle ArnoldSenior Research Scientist (A)
- Michael Lee Dao KangCQT PhD Student
- Nakarin JayjongCQT PhD Student
- Qin QichenCQT PhD Student
- Zhang ZhaoCQT PhD Student
- Zhao QiCQT PhD Student
Recent papers
- Z.Zhang, K. J. Arnold, R.Kaewuam, M.D. Barrett. (2023). 176Lu+ clock comparison at the 10-18 level via correlation spectroscopy. Science Advances 9
- K. J. Arnold, R.Kaewuam, S.R. Chanu, T.R. Tan, Z.Zhang, M.D. Barrett. (2020). Precision measurements on the $^{138}$Ba$^+$ $6s^2S_{1/2}-5d^2D_{5/2}$ clock transition. Phys. Rev. Lett. 124 193001
- R.Kaewuam, T. R. Tan, Z.Zhang, K. J. Arnold, M. S. Safronova, M.D. Barrett. (2020). Precision measurement of the 3D1 and 3D2 quadrupole moments in Lu+. Phys. Rev. A 102 042819
- Z.Zhang, K. J. Arnold, R.Kaewuam, M. S. Safronova, M.D. Barrett. (2020). Hyperfine-mediated effects in a Lu+ optical clock. Phys. Rev. A 102 052834
- R.Kaewuam, T.R. Tan, K. J. Arnold, S.R. Chanu, Z.Zhang, M.D. Barrett. (2020). Hyperfine averaging by dynamic decoupling in a multi-ion lutetium clock. Phys. Rev. Lett. 124 083202
- S.R. Chanu, V. P. W. Koh, K. J. Arnold, R.Kaewuam, T.R. Tan, Z.Zhang, M. S. Safronova, M.D. Barrett. (2020). Magic wavelength of the 138 Ba + 6 s 2 S 1 / 2 – 5 d 2 D 5 / 2 clock transition. Phys. Rev. A 101 042507
- K. J. Arnold, R.Kaewuam, S.R. Chanu, T.R. Tan, Z.Zhang, M.D. Barrett. (2020). Precision Measurements of the 138 Ba + 6 s 2 S 1 / 2 − 5 d 2 D 5 / 2 Clock Transition. Phys. Rev. Lett. 124 193001
