PD Dr. José R. Crespo López-Urrutia, "Coherent laser spectroscopy of ultra-cold highly charged ions in a cryogenic Paul trap using quantum logic”

Wednesday 19 Feb 2020, 14:00 → 16:00 Europe/Zurich

26/1-022 (CERN)

The MPIK-PTB collaboration has recently demonstrated sympathetic cooling of highly charged ions (HCI) in a cryogenic Paul trap, CryPTEx-II [1,2], and in a follow-up experiment at PTB brought them into the Lamb-Dicke regime, and performed quantum-logic spectroscopy [3] on a forbidden transition in Ar13+ ions [4]. This has resulted in an improvement of spectroscopic resolution for HCI by eight orders of magnitude, bringing the measured line widths to the level of ~100 Hz. In this regime, applications of HCI for fundamental studies and frequency metrology become possible [5]. I will also report on a superconducting Paul trap which will become the next upgrade to the CryPTEx-II apparatus, and on planned frequency-metrology experiments in the vacuum-ultraviolet region.   

 

[1] Schmöger, L. et al. Coulomb crystallization of highly charged ions. Science 347, 1233–1236 (2015)

[2] Schmöger, L. et al. Deceleration, precooling, and multi-pass stopping of highly charged ions in Be+ Coulomb crystals. Rev. Sci. Instrum. 86, 103111 (2015).

[3] Schmidt, P. O. et al. Spectroscopy using quantum logic. Science 309, 749–752 (2005) 

[4] Micke, P., Leopold, T., King, S.A. et al. Coherent laser spectroscopy of highly charged ions using quantum logic. Nature 578, 60–65 (2020)

[5] Kozlov, M. G., Safronova, M. S., Crespo López-Urrutia, J. R. & Schmidt, P. O. Highly charged ions: optical clocks and applications in fundamental physics. Rev. Mod. Phys. 90, 045005 (2018)