Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Continuous-Variable Quantum Key Distribution with Rateless
  Reconciliation Protocol   Information reconciliation is crucial for continuous-variable quantum key
distribution (CV-QKD) because its performance affects the secret key rate and
maximal secure transmission distance. Fixed-rate error correction codes limit
the potential applications of the CV-QKD because of the difficulty of
optimizing such codes for different low SNRs. In this paper, we propose a
rateless reconciliation protocol combined multidimensional scheme with Raptor
codes that not only maintains the rateless property but also achieves high
efficiency in different SNRs using just one degree distribution. It
significantly decreases the complexity of optimization and increases the
robustness of the system. Using this protocol, the CV-QKD system can operate
with the optimal modulation variance which maximizes the secret key rate.
Simulation results show that the proposed protocol can achieve reconciliation
efficiency of more than 95% within the range of SNR from -20 dB to 0 dB. It
also shows that we can obtain a high secret key rate at arbitrary distances in
a certain range and achieve a secret key rate of about 5*10^(-4) bits/pulse at
a maximum distance of 132 km (corresponding SNR is -20dB) that is higher than
previous works. The proposed protocol can maintain high efficient key
extraction under the wide range of SNRs and paves the way toward the practical
application of CV-QKD systems in flexible scenarios.

14
The categories of this paper are: math-ph
0
The categories of this paper are: hep-ph
12
The categories of this paper are: nucl-th
29
The categories of this paper are: funct-an
7
The categories of this paper are: hep-th
19
The categories of this paper are: eess
21
The categories of this paper are: adap-org
37
The categories of this paper are: supr-con
23
The categories of this paper are: solv-int
3
The categories of this paper are: physics
9
The categories of this paper are: nlin
30
The categories of this paper are: q-alg
20
The categories of this paper are: acc-phys
36
The categories of this paper are: cmp-lg
25
The categories of this paper are: patt-sol
17
The categories of this paper are: q-fin