\begin{thebibliography}{10}
\newcommand{\enquote}[1]{``#1''}

\bibitem{Xiang2013}
Z.-L. Xiang, S.~Ashhab, J.~Q. You, and F.~Nori, \enquote{Hybrid quantum
  circuits: Superconducting circuits interacting with other quantum systems,}
  Rev. Mod. Phys. \textbf{85}, 623--653 (2013).

\bibitem{Kurizki2015}
G.~Kurizki, P.~Bertet, Y.~Kubo, K.~Molmer, D.~Petrosyan, P.~Rabl, and
  J.~Schmiedmayer, \enquote{Quantum technologies with hybrid systems,}
  Proceedings of the National Academy of Sciences \textbf{112}, 3866--3873
  (2015).

\bibitem{Kimble2008}
H.~J. Kimble, \enquote{The quantum internet,} Nature \textbf{453}, 1023--1030
  (2008).

\bibitem{Waks2009}
E.~Waks and C.~Monroe, \enquote{Protocol for hybrid entanglement between a
  trapped atom and a quantum dot,} Phys. Rev. A \textbf{80}, 062330 (2009).

\bibitem{Wilk:2007hm}
T.~Wilk, S.~C. Webster, A.~Kuhn, and G.~Rempe, \enquote{Single-atom
  single-photon quantum interface,} Science \textbf{317}, 488--490 (2007).

\bibitem{Ritter2012}
S.~Ritter, C.~Nolleke, C.~Hahn, A.~Reiserer, A.~Neuzner, M.~Uphoff, M.~Mucke,
  E.~Figueroa, J.~Bochmann, and G.~Rempe, \enquote{An elementary quantum
  network of single atoms in optical cavities,} Nature \textbf{484}, 195--200
  (2012).

\bibitem{Akopian:2011}
N.~Akopian, L.~Wang, A.~Rastelli, O.~G. Schmidt, and V.~Zwiller,
  \enquote{Hybrid semiconductor-atomic interface: slowing down single photons
  from a quantum dot,} Nat Photon \textbf{5}, 230--233 (2011).

\bibitem{Ulrich2014}
S.~M. Ulrich, S.~Weiler, M.~Oster, M.~Jetter, A.~Urvoy, R.~L\"ow, and
  P.~Michler, \enquote{Spectroscopy of the ${D}_{1}$ transition of cesium by
  dressed-state resonance fluorescence from a single (in,ga)as/gaas quantum
  dot,} Phys. Rev. B \textbf{90}, 125310 (2014).

\bibitem{Siyushev2014}
P.~Siyushev, G.~Stein, J.~Wrachtrup, and I.~Gerhardt, \enquote{Molecular
  photons interfaced with alkali atoms,} Nature \textbf{509}, 66--70 (2014).

\bibitem{Jahn:2015}
J.-P. Jahn, M.~Munsch, L.~B\'eguin, A.~V. Kuhlmann, M.~Renggli, Y.~Huo,
  F.~Ding, R.~Trotta, M.~Reindl, O.~G. Schmidt, A.~Rastelli, P.~Treutlein, and
  R.~J. Warburton, \enquote{An artificial rb atom in a semiconductor with
  lifetime-limited linewidth,} Phys. Rev. B \textbf{92}, 245439 (2015).

\bibitem{Meyer:2015}
H.~M. Meyer, R.~Stockill, M.~Steiner, C.~Le~Gall, C.~Matthiesen, E.~Clarke,
  A.~Ludwig, J.~Reichel, M.~Atat\"ure, and M.~K\"ohl, \enquote{Direct photonic
  coupling of a semiconductor quantum dot and a trapped ion,} Phys. Rev. Lett.
  \textbf{114}, 123001 (2015).

\bibitem{Sondermann2013}
G.~Leuchs and M.~Sondermann, \enquote{Light-matter interaction in free space,}
  Journal of Modern Optics \textbf{60}, 36--42 (2013).

\bibitem{Leong2016}
V.~Leong, M.~A. Seidler, M.~Steiner, A.~Cer\`e, and C.~Kurtsiefer,
  \enquote{Time-resolved scattering of a single photon by a single atom,}
  Nature Communications \textbf{7}, 13716 (2016).

\bibitem{Bufmmodeheckzlseziek1999}
V.~Bu\ifmmode~\check{z}\else \v{z}\fi{}ek, G.~Drobn\'y, M.~G. Kim,
  M.~Havukainen, and P.~L. Knight, \enquote{Numerical simulations of atomic
  decay in cavities and material media,} Phys. Rev. A \textbf{60}, 582--592
  (1999).

\bibitem{Enk2000}
S.~J. van Enk and H.~J. Kimble, \enquote{Single atom in free space as a quantum
  aperture,} Phys. Rev. A \textbf{61}, 051802 (2000).

\bibitem{Enk2001}
S.~J. van Enk and H.~J. Kimble, \enquote{Strongly focused light beams
  interacting with single atoms in free space,} Phys. Rev. A \textbf{63},
  023809 (2001).

\bibitem{Enk2004}
S.~J. van Enk, \enquote{Atoms, dipole waves, and strongly focused light beams,}
  Phys. Rev. A \textbf{69}, 043813 (2004).

\bibitem{Domokos2002}
P.~Domokos, P.~Horak, and H.~Ritsch, \enquote{Quantum description of
  light-pulse scattering on a single atom in waveguides,} Phys. Rev. A
  \textbf{65}, 033832 (2002).

\bibitem{Imamoglu:2008}
D.~Pinotsi and A.~Imamoglu, \enquote{Single photon absorption by a single
  quantum emitter,} Phys. Rev. Lett. \textbf{100}, 093603 (2008).

\bibitem{Agio:2008}
G.~Zumofen, N.~M. Mojarad, V.~Sandoghdar, and M.~Agio, \enquote{Perfect
  reflection of light by an oscillating dipole,} Phys. Rev. Lett. \textbf{101},
  180404 (2008).

\bibitem{Wrigge2008}
G.~Wrigge, I.~Gerhardt, J.~Hwang, G.~Zumofen, and V.~Sandoghdar,
  \enquote{Efficient coupling of photons to a single molecule and the
  observation of its resonance fluorescence,} Nat Phys \textbf{4}, 60--66
  (2008).

\bibitem{Heugel:2009}
S.~Heugel, A.~S. Villar, M.~Sondermann, U.~Peschel, and G.~Leuchs, \enquote{On
  the analogy between a single atom and an optical resonator,} Laser Physics
  \textbf{20}, 100--106 (2009).

\bibitem{Leuchs:2009}
M.~Stobi\ifmmode\acute{n}\else\'{n}\fi{}ska, G.~Alber, and G.~Leuchs,
  \enquote{Perfect excitation of a matter qubit by a single photon in free
  space,} EPL (Europhysics Letters) \textbf{86}, 14007 (2009).

\bibitem{Tey2009}
M.~K. Tey, G.~Maslennikov, T.~C.~H. Liew, S.~A. Aljunid, F.~Huber, B.~Chng,
  Z.~Chen, V.~Scarani, and C.~Kurtsiefer, \enquote{Interfacing light and single
  atoms with a lens,} New Journal of Physics \textbf{11}, 043011 (2009).

\bibitem{Wang:2011}
Y.~Wang, J.~Min{\'a}{\v{r}}, L.~Sheridan, and V.~Scarani, \enquote{{Efficient
  excitation of a two-level atom by a single photon in a propagating mode},}
  Phys. Rev. A \textbf{83}, 063482 (2011).

\bibitem{Leuchs:2012ps}
G.~Leuchs and M.~Sondermann, \enquote{Time-reversal symmetry in optics,}
  Physica Scripta \textbf{85}, 058101 (2012).

\bibitem{Trautmann2016}
N.~Trautmann, G.~Alber, and G.~Leuchs, \enquote{Efficient single-photon
  absorption by a trapped moving atom,} Phys. Rev. A \textbf{94}, 033832
  (2016).

\bibitem{Weisskopf:1930jm}
V.~Weisskopf and E.~Wigner, \enquote{Berechnung der nat{\"u}rlichen
  linienbreite auf grund der diracschen lichttheorie,} Zeitschr. Phys.
  \textbf{63}, 54--73 (1930).

\bibitem{Chaneliere:2006}
T.~Chaneli{\`e}re, D.~N. Matsukevich, and S.~D. Jenkins, \enquote{Quantum
  telecommunication based on atomic cascade transitions,} Phys. Rev. Lett.
  \textbf{96}, 093604 (2006).

\bibitem{Srivathsan:2013}
B.~Srivathsan, G.~K. Gulati, B.~Chng, G.~Maslennikov, D.~Matsukevich, and
  C.~Kurtsiefer, \enquote{Narrow band source of transform-limited photon pairs
  via four-wave mixing in a cold atomic ensemble,} Phys. Rev. Lett.
  \textbf{111}, 123602 (2013).

\bibitem{Piro:2010js}
N.~Piro, F.~Rohde, C.~Schuck, M.~Almendros, J.~Huwer, J.~Ghosh, A.~Haase,
  M.~Hennrich, F.~Dubin, and J.~Eschner, \enquote{Heralded single-photon
  absorption by a single~atom,} Nature Physics \textbf{7}, 17--20 (2010).

\bibitem{Sandoghdar:2012}
Y.~L.~A. Rezus, S.~G. Walt, R.~Lettow, A.~Renn, G.~Zumofen, S.~G\"otzinger, and
  V.~Sandoghdar, \enquote{Single-photon spectroscopy of a single molecule,}
  Phys. Rev. Lett. \textbf{108}, 093601 (2012).

\bibitem{Brito:2016}
J.~Brito, S.~Kucera, P.~Eich, P.~M{\"u}ller, and J.~Eschner, \enquote{Doubly
  heralded single-photon absorption by a single atom,} Applied Physics B
  \textbf{122}, 1--5 (2016).

\bibitem{Tey:2008}
M.~K. Tey, Z.~Chen, S.~A. Aljunid, B.~Chng, F.~Huber, G.~Maslennikov, and
  C.~Kurtsiefer, \enquote{Strong interaction between light and a single trapped
  atom without the need for a cavity,} Nature Physics \textbf{4}, 924--927
  (2008).

\bibitem{Franson:1992cl}
J.~D. Franson, \enquote{Nonlocal cancellation of dispersion,} Phys. Rev. A
  \textbf{45}, 3126--3132 (1992).

\bibitem{Srivathsan:2014jx}
B.~Srivathsan, G.~K. Gulati, A.~Cer{\`e}, B.~Chng, and C.~Kurtsiefer,
  \enquote{Reversing the temporal envelope of a heralded single photon using a
  cavity,} Phys. Rev. Lett. \textbf{113}, 163601 (2014).

\bibitem{Gulati:2014}
G.~K. Gulati, B.~Srivathsan, B.~Chng, A.~Cer\`e, D.~Matsukevich, and
  C.~Kurtsiefer, \enquote{Generation of an exponentially rising single-photon
  field from parametric conversion in atoms,} Phys. Rev. A \textbf{90}, 033819
  (2014).

\bibitem{Jen:2012}
H.~H. Jen, \enquote{Spectral analysis for cascade-emission-based quantum
  communication in atomic ensembles,} J. Phys. B: At. Mol. Opt. Phys.
  \textbf{45}, 165504 (2012).

\bibitem{Chin2016}
Y.-S. Chin, M.~Steiner, and C.~Kurtsiefer, \enquote{Quantifying the role of
  thermal motion in free-space light-atom interaction,} arXiv p.
  arXiv:1611.08048 (2016).

\bibitem{Georgiades:1995}
N.~P. Georgiades, E.~S. Polzik, K.~Edamatsu, H.~J. Kimble, and A.~S. Parkins,
  \enquote{Nonclassical excitation for atoms in a squeezed vacuum,} Phys. Rev.
  Lett. \textbf{75}, 3426--3429 (1995).

\bibitem{Strauss:2016}
M.~Strau\ss{}, M.~Placke, S.~Kreinberg, C.~Schneider, M.~Kamp, S.~H\"ofling,
  J.~Wolters, and S.~Reitzenstein, \enquote{Photon-statistics excitation
  spectroscopy of a single two-level system,} Phys. Rev. B \textbf{93}, 241306
  (2016).

\bibitem{Alber2016}
L.~Alber, M.~Fischer, M.~Bader, K.~Mantel, M.~Sondermann, and G.~Leuchs,
  \enquote{Focusing characteristics of a 4$\pi$ parabolic mirror light-matter
  interface,} arxiv.org p. arXiv:1609.06884 (2016).

\end{thebibliography}