Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Finite-range multiplexing enhances quantum key distribution via quantum
  repeaters   Quantum repeaters represent one possible way to achieve long-distance quantum
key distribution. Collins et al. in [Phys. Rev. Lett. 98, 060502 (2007)]
proposed multiplexing as method to increase the repeater rate and to decrease
the requirement in memory coherence time. Motivated by the experimental fact
that long-range connections are practically demanding, in this paper we extend
the original quantum repeater multiplexing protocol to the case of short-range
connection. We derive analytical formulas for the repeater rate and we show
that for short connection lengths it is possible to have most of the benefits
of a full-range multiplexing protocol. Then we incorporate decoherence of
quantum memories and we study the optimal matching for the Bell-state
measurement protocol permitting to minimize memory requirements. Finally, we
calculate the secret key rate and we show that the improvement via finite-range
multiplexing is of the same order of magnitude as via full-range multiplexing.

27
The categories of this paper are: comp-gas
10
The categories of this paper are: q-bio
34
The categories of this paper are: chem-ph
33
The categories of this paper are: plasm-ph
3
The categories of this paper are: physics
22
The categories of this paper are: chao-dyn
23
The categories of this paper are: solv-int
35
The categories of this paper are: mtrl-th
8
The categories of this paper are: hep-ex
15
The categories of this paper are: nucl-ex
36
The categories of this paper are: cmp-lg
1
The categories of this paper are: cs
5
The categories of this paper are: gr-qc
28
The categories of this paper are: alg-geom
7
The categories of this paper are: hep-th
11
The categories of this paper are: hep-lat