Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A 24 km fiber-based discretely signaled continuous variable quantum key
  distribution system   We report a continuous variable key distribution system that achieves a final
secure key rate of 3.45 kb/sec over a distance of 24.2 km of optical fiber. The
protocol uses discrete signaling and post-selection to improve reconciliation
speed and quantifies security by means of quantum state tomography.
Polarization multiplexing and a frequency translation scheme permit
transmission of a continuous wave local oscillator and suppression of noise
from guided acoustic wave Brillouin scattering by more than 27 dB.

7
The categories of this paper are: hep-th
19
The categories of this paper are: eess
30
The categories of this paper are: q-alg
36
The categories of this paper are: cmp-lg
24
The categories of this paper are: dg-ga
6
The categories of this paper are: astro-ph
35
The categories of this paper are: mtrl-th
14
The categories of this paper are: math-ph
20
The categories of this paper are: acc-phys
31
The categories of this paper are: ao-sci
25
The categories of this paper are: patt-sol
29
The categories of this paper are: funct-an
33
The categories of this paper are: plasm-ph
21
The categories of this paper are: adap-org
12
The categories of this paper are: nucl-th
22
The categories of this paper are: chao-dyn