Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Composable end-to-end security of Gaussian quantum networks with
  untrusted relays   Gaussian networks are fundamental objects in network information theory. Here
many senders and receivers are connected by physically motivated Gaussian
channels while auxiliary Gaussian components, such as Gaussian relays, are
entailed. Whilst the theoretical backbone of classical Gaussian networks is
well established, the quantum analogue is yet immature. Here, we theoretically
tackle composable security of arbitrary Gaussian quantum networks (quantum
networks), with generally untrusted nodes, in the finite-size regime and put
forward a general methodology for parameter estimation, which is only based on
the data shared by the remote end-users. Taking a chain of quantum repeaters as
an example, we find that the composable key rate of the chain can beat the
fundamental repeaterless limit with practical block sizes.

29
The categories of this paper are: funct-an
18
The categories of this paper are: econ
34
The categories of this paper are: chem-ph
27
The categories of this paper are: comp-gas
1
The categories of this paper are: cs
15
The categories of this paper are: nucl-ex
32
The categories of this paper are: atom-ph
28
The categories of this paper are: alg-geom
37
The categories of this paper are: supr-con
26
The categories of this paper are: bayes-an
36
The categories of this paper are: cmp-lg
9
The categories of this paper are: nlin
23
The categories of this paper are: solv-int
31
The categories of this paper are: ao-sci
19
The categories of this paper are: eess
25
The categories of this paper are: patt-sol