Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Demonstration of Slow Light in a Rubidium Vapour Using Single Photons
  from a Trapped Ion   Practical implementation of quantum networks are likely to interface
different types of quantum systems. When photonic interconnects link the
systems together, they must preserve the quantum properties of the photon.
These light-matter interfaces may be used as necessary communication tools,
such as to synchronise photon arrival times for entanglement distribution.
Trapped ions are strong candidates for communication nodes owing to their long
qubit life time (C. Langer, et al., PRL., 238, 060502, (2005)) and high
fidelity ion-photon entanglement (A. Stute, et al., Nat., 485, 482, (2012)),
whilst neutral atoms are versatile quantum systems, useful as memories (L.M.
Duan, et al., Nat., 414, 413 (2001), B. Jing, et al., arXiv:1801.01193, H. P.
Specht, Nat., 473, 190 (2011)), for photon storage (O. Katz, et al., Nat.
Comm., 9, 2074 (2018)) or tunable photon delay via slow light (R. M. Camacho et
al., PRA, 73, 063812, (2006), Camacho et al., PRL, 98, 153601, (2007)).
Development of these two quantum technologies has largely proceeded in separate
tracks, partly due to their disparate wavelengths of operation, but combining
these platforms offers a compelling hybrid quantum system for use in quantum
networking and distributed quantum computing. Here, we demonstrate the first
interaction of photons emitted from a trapped ion, with neutral atoms by
implementing slow light in a warm atomic vapour. We use two hyperfine
absorption resonances in a warm $^{87}$Rb vapour to provide a slow light medium
in which a single photon from a trapped Ba$^+$ ion is delayed by up to
13.5$\pm$0.5 ns. The delay is tunable and preserves the temporal properties of
the photons. This result showcases a hybrid interface, useful for linking
different quantum systems together, or as a synchronisation tool for the
arrival times of photons - an essential tool for future quantum networks.

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The categories of this paper are: cond-mat
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The categories of this paper are: ao-sci
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The categories of this paper are: stat
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The categories of this paper are: bayes-an
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The categories of this paper are: comp-gas
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The categories of this paper are: alg-geom
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The categories of this paper are: nucl-th
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The categories of this paper are: acc-phys
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The categories of this paper are: chem-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: supr-con
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The categories of this paper are: adap-org
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The categories of this paper are: dg-ga
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The categories of this paper are: eess
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The categories of this paper are: q-bio
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The categories of this paper are: math-ph