Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Hybrid Parallel Quantum Key Distribution Protocol   The practical realizations of BB84 quantum key distribution protocol using
single-photon or weak coherent states have normally presented low efficiency,
in the meaning that most bits sent by Alice are not useful for the final key.
In this work, we show an optical setup to improve the transmission rate of
useful bits putting together two ideas, parallel quantum key distribution and
physical encryption using mesoscopic coherent states. The final result is a
four time faster quantum key distribution setup.

2
The categories of this paper are: math
19
The categories of this paper are: eess
3
The categories of this paper are: physics
35
The categories of this paper are: mtrl-th
18
The categories of this paper are: econ
15
The categories of this paper are: nucl-ex
8
The categories of this paper are: hep-ex
9
The categories of this paper are: nlin
31
The categories of this paper are: ao-sci
33
The categories of this paper are: plasm-ph
16
The categories of this paper are: stat
5
The categories of this paper are: gr-qc
20
The categories of this paper are: acc-phys
14
The categories of this paper are: math-ph
0
The categories of this paper are: hep-ph
21
The categories of this paper are: adap-org