Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Remote distribution of non-classical correlations over 1250 modes
  between a telecom photon and a $^{171}$Yb$^{3+}$:Y$_2$SiO$_{5}$ crystal   Quantum repeaters based on heralded entanglement require quantum nodes that
are able to generate multimode quantum correlations between memories and
telecommunication photons. The communication rate scales linearly with the
number of modes, yet highly multimode quantum storage remains challenging. In
this work, we demonstrate an atomic frequency comb quantum memory with a
time-domain mode capacity of 1250 modes and a bandwidth of 100 MHz, to our
knowledge the largest number of modes stored in the quantum regime. The memory
is based on a $Y_{2}SiO_{5}$ crystal doped with $^{171}Yb^{3+}$ ions, with a
memory wavelength of 979 nm. The memory is interfaced with a source of
non-degenerate photon pairs at 979 and 1550 nm, bandwidth-matched to the
quantum memory. We obtain strong non-classical second-order cross correlations
over all modes, for storage times of up to $25$ $\mu s$. The telecommunication
photons propagated through 5 km of fiber before the release of the memory
photons, a key capability for quantum repeaters based on heralded entanglement
and feed-forward operations. Building on this experiment should allow
distribution of entanglement between remote quantum nodes, with enhanced rates
owing to the high multimode capacity.

25
The categories of this paper are: patt-sol
22
The categories of this paper are: chao-dyn
28
The categories of this paper are: alg-geom
4
The categories of this paper are: cond-mat
0
The categories of this paper are: hep-ph
24
The categories of this paper are: dg-ga
21
The categories of this paper are: adap-org
11
The categories of this paper are: hep-lat
15
The categories of this paper are: nucl-ex
10
The categories of this paper are: q-bio
1
The categories of this paper are: cs
33
The categories of this paper are: plasm-ph
12
The categories of this paper are: nucl-th
36
The categories of this paper are: cmp-lg
35
The categories of this paper are: mtrl-th
3
The categories of this paper are: physics