Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: High Efficiency Postprocessing for Continuous-variable Quantum Key
  Distribution: Using All Raw Keys for Parameter Estimation and Key Extraction   High efficiency postprocessing of continuous-variable quantum key
distribution system has a significant impact on the secret key rate and
transmission distance of the system. Currently, the postprocessing mainly
contains four steps in the following order: sifting, parameter estimation,
information reconciliation, and privacy amplification. For a quantum channel
with unknown prior characteristics, part of the raw keys (typically half) have
to be sacrificed to estimate the channel parameters, which is used to assist in
error correction (part of information reconciliation) and estimate the secret
key rate. This introduces a tradeoff between the secret key rate and the
accuracy of parameter estimation when considering the finite-size effect. In
this paper, we propose a high efficiency postprocessing method which uses all
the raw keys for both parameter estimation and key extraction. It is realized
by exchanging the order of parameter estimation and information reconciliation,
while the other steps remain unchanged. After the sifting step, the extra data
(used for phase compensation and synchronization etc) can be used to roughly
estimate the quantum channel parameters, or using the estimated results of last
block, thus the error correction can be realized normally. After the success of
error correction, the reconciler recovers the raw keys of the other side by a
reverse mapping function. Then she uses all the raw keys of both sides for
parameter estimation to estimate the quantum channel parameters and calculate
the secret key rate of the system. Finally, they perform the privacy
amplification step to obtain the unconditional security keys. We show that this
method improves the accuracy of parameter estimation and the secret key rate of
continuous-variable quantum key distribution system.

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The categories of this paper are: funct-an
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The categories of this paper are: dg-ga
2
The categories of this paper are: math
0
The categories of this paper are: hep-ph
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The categories of this paper are: hep-th
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The categories of this paper are: patt-sol
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The categories of this paper are: astro-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: nucl-ex
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The categories of this paper are: math-ph
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The categories of this paper are: adap-org
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The categories of this paper are: hep-ex
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The categories of this paper are: atom-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: econ
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The categories of this paper are: plasm-ph