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\documentclass[11pt]{article}

\usepackage{hrms}  %% Page settings, style ... for the HRMS abstract book.

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\title{PRECISION SPECTROSCOPY AND COHERENT MANIPULATION OF A SINGLE MOLECULAR NITROGEN ION}

%% Note that \author and \address macros must be paired.
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\author{\underline{\FirstName R. \LastName KARL},
\FirstName A. \LastName SHLYKOV,
\FirstName M. \LastName ROGUSKI and
\FirstName S. \LastName WILLITSCH}
\address{Department of Chemistry, University of Basel, 4056 Basel, Switzerland}

%% The \FirstName and \LastName macros are mandatory for each author
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%% Place below other \usepackage{ ... }, if you need other packages.
%% See http://www.tug.org/texlive/doc.html for a description of available packages.

%% The macros below will change the page head and foot.
%% Please, do not modify the content of the \fancyhead macro nor the \fancyfoot line.
\usepackage{fancyhdr}
\pagestyle{fancy}
\fancyhead[C]{{\footnotesize \textit{HRMS, 28th Colloquium, Dijon, France,
  Aug. 28 - Sept. 1, 2023}}}
\fancyfoot[C]{}
\renewcommand{\headrulewidth}{0.6pt}
\renewcommand{\footrulewidth}{0.6pt}

%% The hyperref package allows to include hyperlinks in a document.
%% See the instructions for abstract submission for more details.
%% WARNING: Make sure that this package comes LAST since it re-defines many LaTeX macros.
\usepackage[colorlinks=true,urlcolor=blue,linkcolor=blue,citecolor=blue]{hyperref}
\voffset -.65 cm

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\begin{document}

\maketitle  %% This will also build the list of author(s) and addresse(s).

%% Index macro(s): see the abstract samples and the instructions
%% Remove the %% to account for the index item(s)
\index{N$_2^+$}
\index{N2+}
\index{Nitrogen}
\index{Molecular Ions}
\index{Quantum-Logic Spectroscopy}
\index{Precision Spectroscopy}
\index{Rotational Spectroscopy}
\index{Vibrational Spectroscopy}
\index{Rovibrational Spectroscopy}

%% Place the body of your abstract below.
Within the rich energy level structure of molecules, transitions with advantageous 
properties for precision studies and molecular quantum technologies can be found. 
However, without closed cycling transitions and frequencies ranging from MHz for 
hyperfine transitions to GHz in rotational transitions and THz in ro-vibrational transitions\footnote{K. Najafian, Z. Meir, and S. Willitsch. \textit{Phys. Chem. Chem. Phys.}, 22:23083, 2020. \href{https://doi.org/10.1039/D0CP03906C}{DOI: 10.1039/d0cp03906c}},
efficient cooling of translational degrees of freedom, as well as coherent state 
preparation, manipulation, and readout, becomes challenging. 
We produce a single N2+ ion in its internal ground state using threshold
photoionization\footnote{A. Shlykov, M. Roguski and S. Willitsch. \textit{In preparation.}}
and use Doppler, Sideband, and EIT laser cooling on a co-trapped calcium ion to reach 
the motional ground state. With a quantum-logic protocol that uses the calcium ion as a
probe for the molecular state, we achieve quantum non-demolition state detection with
fidelities over 99\%\footnote{M. Sinhal, Z. Meir, K. Najafian, G. Hegi, and S. Willitsch.
\textit{Science}, 367:1213, 2020.
\href{https://doi.org/10.1126/science.aaz9837}{DOI: 10.1126/science.aaz9837}}.
Our current efforts go towards precision-spectroscopy on non-dipole-allowed rotational
and ro-vibrational transitions using frequency sources that are referenced to the
Swiss primary frequency standard at METAS\footnote{D. Husmann \textit{et al. Opt. Express},
29:24592, 2021. \href{https://doi.org/10.1364/OE.427921}{DOI: 10.1364/OE.427921}}.
Beyond precision-spectroscopy, the methodologies that we develop pave the way for
the implementation of molecular qubits, for establishing new frequency standards 
in the mid-IR regime, and for investigating state-to-state dynamics of chemical reactions.

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