Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Towards efficient quantum memory of orbital angular momentum qubits in
  cold atoms   The spatial modes of light, carrying a quantized amount of orbital angular
momentum (OAM), is one of the excellent candidates that provides access to
high-dimensional quantum states, which essentially makes it promising towards
building high-dimensional quantum networks. In this paper, we report the
storage and retrieval of photonic qubits encoded with OAM state in the cold
atomic ensemble, achieving an average conditional fidelity above 98% and
retrieval efficiency around 65%. The photonic OAM qubits are encoded with weak
coherent states at the single-photon level and the memory is based on
electromagnetically induced transparency in an elongated cold rubidium atomic
ensemble. Our work constitutes an efficient node that is needed towards high
dimensional and large scale quantum networks.

17
The categories of this paper are: q-fin
6
The categories of this paper are: astro-ph
18
The categories of this paper are: econ
28
The categories of this paper are: alg-geom
30
The categories of this paper are: q-alg
25
The categories of this paper are: patt-sol
31
The categories of this paper are: ao-sci
32
The categories of this paper are: atom-ph
21
The categories of this paper are: adap-org
37
The categories of this paper are: supr-con
19
The categories of this paper are: eess
1
The categories of this paper are: cs
35
The categories of this paper are: mtrl-th
23
The categories of this paper are: solv-int
12
The categories of this paper are: nucl-th
15
The categories of this paper are: nucl-ex