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\begin{document}
\scBookLanguage{de}
\begin{scAbstract}
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\scLanguage{en}
\scTitle{Spectral Compression of Narrowband Single Photons}
\scAuthor{}{Mathias A.}{Seidler}{1}
\scAuthor{*}{Xi Jie}{Yeo}{1}
\scAuthor{}{Alessandro}{Cerè}{1}
\scAuthor{}{Christian}{Kurtsiefer}{1,2}
\scAffiliation{1}{Centre for Quantum Technologies, Singapore}
\scAffiliation{2}{National University of Singapore, Singapore}
\scBeginText
We present a successful experimental demonstration of a spectral compression of
heralded single photons with narrow spectral bandwidth around $795$\,nm. The
original photons are generated through four-wave mixing in a cloud of cold
Rubidium-87 atoms and have a bandwidth about $3$ times larger than the
corresponding atomic transition. Our spectral compression method was inspired
by techniques to compress ultra-fast pulses. We chose an asymmetric cavity as
the dispersion medium. The design of the cavity also ensures that spectral
compression can be performed, in principle,  without any optical
losses. Experimentally. we were able to compress the spectral bandwidth of the photons by a factor of
$2.6$, from $20.6$\,MHz to less than $8$\,MHz, almost matching the
corresponding atomic transition linewidth of $6$\,MHz. The better matching of
photon bandwidths allow for more efficient of photon-atom interaction, which
is crucial in many applications involving quantum interfaces.
\scEndText
\scConference{Freiburg 2019}
\scPart{FM}
\scContributionType{Talk}
\scTopic{Enabling Technologies: Sources of Quantum States of Light}
\scEmail{nik.yeo.xi.jie@gmail.com}
\scCountry{Singapore}
\end{scAbstract}
\end{document}
