Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Security-proof framework for two-way Gaussian quantum-key-distribution
  protocols   Two-way Gaussian protocols have the potential to increase quantum key
distribution (QKD) protocols' secret-key rates by orders of
magnitudes~[Phys.~Rev.~A {\bf 94}, 012322 (2016)]. Security proofs for two-way
protocols, however, are underdeveloped at present. In this paper, we establish
a security proof framework for the general coherent attack on two-way Gaussian
protocols in the asymptotic regime. We first prove that coherent-attack
security can be reduced to collective-attack security for all two-way QKD
protocols. Next, we identify two different constraints that each provide
intrusion parameters which bound an eavesdropper's coherent-attack information
gain for any two-way Gaussian QKD protocol. Finally, we apply our results to
two such protocols.

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The categories of this paper are: astro-ph
29
The categories of this paper are: funct-an
21
The categories of this paper are: adap-org
15
The categories of this paper are: nucl-ex
30
The categories of this paper are: q-alg
12
The categories of this paper are: nucl-th
34
The categories of this paper are: chem-ph
14
The categories of this paper are: math-ph
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The categories of this paper are: q-fin
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The categories of this paper are: eess
24
The categories of this paper are: dg-ga
1
The categories of this paper are: cs
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The categories of this paper are: patt-sol
2
The categories of this paper are: math
11
The categories of this paper are: hep-lat
28
The categories of this paper are: alg-geom