Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Closing the gap of secure quantum key rate with the Heralded
  Pair-Coherent States   In this paper, we investigate the long-standing gap of quantum key rate
between the Weak Coherent Pulse (WCP) and Heralded Single Photon Sources(HSPS)
implementation of quantum cryptographical protocol. We prove that, by utilizing
the Heralded Pair Coherent State (HPCS) photon sources, such a gap can be
actually filled in both BB84 and SARG quantum key distribution. Thus, a
universal photon source which achieves the up-to-date optimal key rate for each
transmission distance is obtained.

11
The categories of this paper are: hep-lat
17
The categories of this paper are: q-fin
3
The categories of this paper are: physics
27
The categories of this paper are: comp-gas
16
The categories of this paper are: stat
30
The categories of this paper are: q-alg
12
The categories of this paper are: nucl-th
22
The categories of this paper are: chao-dyn
20
The categories of this paper are: acc-phys
6
The categories of this paper are: astro-ph
28
The categories of this paper are: alg-geom
2
The categories of this paper are: math
21
The categories of this paper are: adap-org
9
The categories of this paper are: nlin
4
The categories of this paper are: cond-mat
32
The categories of this paper are: atom-ph