Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Teleportation-based collective attacks in Gaussian quantum key
  distribution   In Gaussian quantum key distribution eavesdropping attacks are conventionally
modeled through the universal entangling cloner scheme, which is based on the
premise that the whole environment is under control of the adversary, i.e., the
eavesdropper purifies the system. This assumption implies that the eavesdropper
has either access to an identity (noiseless) channel or infinite amount of
entanglement in order to simulate such an identity channel. In this work, we
challenge the necessity of this assumption, and we propose a
teleportation-based eavesdropping attack, where the eavesdropper is not assumed
to have access to the shared channel, that represents the unavoidable noise due
to the environment. Under collective measurements, this attack reaches
optimality in the limit of infinite amount of entanglement, while for finite
entanglement resources it outperforms the corresponding optimal individual
attack. We also calculate the minimum amount of distributed entanglement that
is necessary for this eavesdropping scheme, since we consider it as the
operationally critical quantity capturing the limitations of a realistic
attack. We conclude that the fact that infinite amount of entanglement is
required for an optimal collective eavesdropping attack signifies the
robustness of Gaussian quantum key distribution.

22
The categories of this paper are: chao-dyn
8
The categories of this paper are: hep-ex
19
The categories of this paper are: eess
24
The categories of this paper are: dg-ga
29
The categories of this paper are: funct-an
3
The categories of this paper are: physics
30
The categories of this paper are: q-alg
17
The categories of this paper are: q-fin
1
The categories of this paper are: cs
21
The categories of this paper are: adap-org
31
The categories of this paper are: ao-sci
6
The categories of this paper are: astro-ph
5
The categories of this paper are: gr-qc
37
The categories of this paper are: supr-con
0
The categories of this paper are: hep-ph
15
The categories of this paper are: nucl-ex