Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Practical security bounds against the Trojan-horse attack in quantum key
  distribution   In the quantum version of a Trojan-horse attack, photons are injected into
the optical modules of a quantum key distribution system in an attempt to read
information direct from the encoding devices. To stop the Trojan photons, the
use of passive optical components has been suggested. However, to date, there
is no quantitative bound that specifies such components in relation to the
security of the system. Here, we turn the Trojan-horse attack into an
information leakage problem. This allows us quantify the system security and
relate it to the specification of the optical elements. The analysis is
supported by the experimental characterization, within the operation regime, of
reflectivity and transmission of the optical components most relevant to
security.

21
The categories of this paper are: adap-org
3
The categories of this paper are: physics
15
The categories of this paper are: nucl-ex
35
The categories of this paper are: mtrl-th
18
The categories of this paper are: econ
6
The categories of this paper are: astro-ph
5
The categories of this paper are: gr-qc
9
The categories of this paper are: nlin
29
The categories of this paper are: funct-an
34
The categories of this paper are: chem-ph
33
The categories of this paper are: plasm-ph
24
The categories of this paper are: dg-ga
16
The categories of this paper are: stat
23
The categories of this paper are: solv-int
14
The categories of this paper are: math-ph
26
The categories of this paper are: bayes-an