Related papers: Precision measurement of the ionization energy of a single trapped $^{40}$Ca$^+$ ion by Rydberg series excitation

Precision measurement of the ionization energy of a single trapped $^{40}$Ca$^+$ ion by Rydberg series excitation

URL: http://arxiv.org/abs/2009.01070v1
Date: Wed, 2 Sep 2020 13:47:48 GMT
Title: Precision measurement of the ionization energy of a single trapped $^{40}$Ca$^+$ ion by Rydberg series excitation
Authors: Justas Andrijauskas, Jonas Vogel, Arezoo Mokhberi and Ferdinand Schmidt-Kaler
Abstract summary: We carried out Rydberg series spectroscopy for $nS_1/2$ states with $38 leq n leq 65$ and for $nD_5/2$ states with $37leq n leq 50$ on a single trapped $40$Ca$+$ ion. From a nonlinear regression to resonance, we determined the ionization energy of 2 870 575.582 GHz, measured 60 times more accurately as compared to the accepted value and contradicting it by 7.5 standard deviations.
Score: 25.488181126364186
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Abstract: A complete set of spectroscopic data is indispensable when using Rydberg states of trapped ions for quantum information processing. We carried out Rydberg series spectroscopy for $nS_{1/2}$ states with $38 \leq n \leq 65$ and for $nD_{5/2}$ states with $37\leq n \leq 50$ on a single trapped $^{40}$Ca$^+$ ion. From a nonlinear regression to resonance frequencies, we determined the ionization energy of 2 870 575.582(15) GHz, measured 60 times more accurately as compared to the accepted value and contradicting it by 7.5 standard deviations. We confirm quantum defect values of $\delta_{S_{1/2}}=1.802995(5)$ and $\delta_{D_{5/2}}=0.626888(9)$ for $nS_{1/2}$ and $nD_{5/2}$ states respectively, which allow for unambiguous addressing of Rydberg levels of Ca$^+$ ions.

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