| Zugriffsnummer | 41769 |
| Dokumenttyp | Dissertation |
| Peer Review | unbekannt |
| Sprache | Englisch |
| Titel | A cryogenic ion trap system for quantum logic spectroscopy of highly charged ions |
| Autor(in); Institution |
Leopold, Tobias; QUEST Institute for Experimental Quantum Metrology, PTB-Braunschweig
|
| Quelle/Jahr | (2018), 176 S. |
| Schriftenreihe | PTB-Bericht PTB-Opt-81 |
| Dissertationsvermerk | Dissertation, Universität Hannover, 2018 |
| Herausgeber(in) |
Physikalisch-Technische Bundesanstalt
|
| ISSN | 0341-6712 |
| ISBN | 978-3-95606-418-0 |
| Berichtsnummer | PTB-Opt-81 |
| Verlag | Bremen: Fachverlag NW in der Carl Schünemann Verlag GmbH |
| Freie Schlagworte | trapped ions ; highly charged ions ; frequency metrology |
| Zusammenfassung | Today, optical frequency metrology reaches a fractional accuracy outperforming primary caesium standards by two orders of magnitude. The accuracy is limited by the degree to which systematic frequency shifts induced by external influences can be controlled. highly charged ions offer atmoic systems with low sensitivities to external perturbations and are thus promising candidates for next generation optical atomic frequency standards. Additionally, these systems are often sensitive to effects proposed by extensions to the Standard Model of particle physics, enabling highest precision fundamental physics testsat low energy. Precision spectroscopy of highly charged ions was so far hindered by the high kinetic energies inherent to their creation. With the experimental techniques developed for the aluminium quantum logic clock, highly charged ions can be sympathetically cooled and prepared in their motional ground state in a Paul trap. The techniques require a second ion species with a level structure permitting laser cooling and coherent state manipulation between metastable states. The 9Be+ ion has been employed for quantum information processing experiments for a long time and is well-matched for quantum logic with highly charged ions. Within this thesis, a new experimental apparatus is presented, which was specifically designed for optical frequency metrology of highly charged ions. The necessary cooling and quantum logic protocols are based on coherent control of beryllium ions. A cryogenic ion trap system was designed and set up including a novel Paul trap adapted to cryogenic operation. The apparatus was optimised and characterised regarding mechanical vibrations and low temperature performance. In the horizontal plane, vibrations were limited to the 10 nm level at a cryogenic operating temperature of 5 K, driven by a pulse tube cryocooler. The laser systems necessary to cool and coherently control beryllium ions are presented, as well as two spectroscopy laser setups for spectroscopy of Ar13+. The ion trap was characterised in terms of magnetic shielding, heating rates and micromotion by means of spectroscopy of single trapped 9Be+ ions. It is shown that there are no technical limitations in the presented apparatus prohibiting spectroscopy of highly charged ions beyond the 10-16 level of fractional accuracy, which is a 9 orders of magnitude improvement to state-of-the-art spectroscopic precision in highly charged ions. |
