Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum communications with time-bin entangled photons: long distance
  quantum teleportation and quantum repeaters   Using 2 km of standard telecom optical fibres, we teleport qubits carried by
photons of 1310 nm wavelength to qubits in another lab carried by a photons of
1550 nm wavelength. The photons to be teleported and the necessary entangled
photon pairs are created in two different non-linear crystals. The measured
mean fidelity is of 81.2 %. We discuss how this could be used as quantum
repeaters without quantum memories.

24
The categories of this paper are: dg-ga
29
The categories of this paper are: funct-an
1
The categories of this paper are: cs
16
The categories of this paper are: stat
10
The categories of this paper are: q-bio
5
The categories of this paper are: gr-qc
12
The categories of this paper are: nucl-th
33
The categories of this paper are: plasm-ph
14
The categories of this paper are: math-ph
20
The categories of this paper are: acc-phys
32
The categories of this paper are: atom-ph
19
The categories of this paper are: eess
6
The categories of this paper are: astro-ph
27
The categories of this paper are: comp-gas
22
The categories of this paper are: chao-dyn
28
The categories of this paper are: alg-geom