A Single Trapped Rydberg Ion

Abstract

This document was typeset using the typographical look-and-feel classicthesis developed by André Miede and Ivo Pletikosić. The style was inspired by Robert Bringhurst's "The Elements of Typographic Style".

Determination of quantum defect for the Rydberg P series of Ca II

“…Since such a trap frequency alternation is two orders of magnitude larger for radial modes as compared to an axial mode in a typical experiment, the shift of the Rydberg line transition is mainly affected by radial phonon distributions. This shift depends on the sign of the polarisability of Rydberg states, e.g., shifts towards larger frequencies for n P states of Ca+ with negative polarisabilities (see measured shifts towards smaller frequencies for Rydberg S states of Sr + with positive polarisabilities [30]). Doppler cooling limit in this case is estimated to be about 5 mK.…”

Trapped Rydberg ions: A new platform for quantum information processing

“…(7) For 50S and 4 µm inter-ion distance Table 1. Properties of the Rydberg atoms and ions scaling with the principal quantum number n and the core charge Z [95]. For neutral Rydberg atoms Z = +1 and for singly-charged Rydberg ions Z = +2, which have overall charge of one unit of elementary positive charge +e.…”

“…The likelihood of double ionisation events might increase when using a thermal oven, which can be inferred to the black-body radiation effect [95]. A good low-temperature alternative is cryogenic Paul traps [130], in which the atomic flux is generated by laser ablation [122].…”

“…A good low-temperature alternative is cryogenic Paul traps [130], in which the atomic flux is generated by laser ablation [122]. Ion loading by laser ablation was reported to improve experiments with Rydberg Sr + ions [95] (Sec. 4.5).…”

“…Rydberg state spectroscopy in combination with Rydberg-series extrapolation provides the most precise method for determining the ionization threshold I ++ [154,155]. For trapped Rydberg ions, S and D Rydberg series of 88 Sr + ions [95] and S, P, D and F series of 40 Ca + ions [4,7,8,156] were used to determine the quantum defects and their ionization energies. The most precise measurement has been done for the S states of a single Ca + ion using the two-step Rydberg excitation scheme (Sec.…”