Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Rotation Based Slice Error Correction Protocol for Continuous-variable
  Quantum Key Distribution and its Implementation with Polar Codes   Reconciliation is an essential procedure for continuous-variable quantum key
distribution (CV-QKD). As the most commonly used reconciliation protocol in
short-distance CV-QKD, the slice error correction (SEC) allows a system to
distill more than 1 bit from each pulse. However, its quantization efficiency
is greatly affected by the noisy channel with a low signal-to-noise ratio
(SNR), which usually limits the secure distance to about 30 km. In this paper,
an improved SEC protocol, named Rotation-based SEC (RSEC), is proposed through
performing a random orthogonal rotation on the raw data before quantization,
and deducing a new estimator for quantized sequences. Moreover, the RSEC
protocol is implemented with polar codes. Experimental results show that the
proposed protocol can reach up to a quantization efficiency of about 99\%, and
maintains at around 96\% even at the relatively low SNRs $(0.5,1)$, which
theoretically extends the secure distance to about 45 km. When implemented with
the polar codes with block length of 16 Mb, the RSEC can achieve a
reconciliation efficiency of above 95\%, which outperforms all previous SEC
schemes. In terms of finite-size effects, we achieve a secret key rate of
$7.83\times10^{-3}$ bits/pulse at a distance of 33.93 km (the corresponding SNR
value is 1). These results indicate that the proposed protocol significantly
improves the performance of SEC and is a competitive reconciliation scheme for
the CV-QKD system.

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The categories of this paper are: atom-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: plasm-ph
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The categories of this paper are: solv-int
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The categories of this paper are: q-fin
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The categories of this paper are: q-bio
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The categories of this paper are: alg-geom
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The categories of this paper are: nucl-th
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The categories of this paper are: comp-gas
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The categories of this paper are: funct-an
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The categories of this paper are: stat
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The categories of this paper are: econ
0
The categories of this paper are: hep-ph
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The categories of this paper are: hep-th
14
The categories of this paper are: math-ph
4
The categories of this paper are: cond-mat