Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Finite key analysis for symmetric attacks in quantum key distribution   We introduce a constructive method to calculate the achievable secret key
rate for a generic class of quantum key distribution protocols, when only a
finite number n of signals is given. Our approach is applicable to all
scenarios in which the quantum state shared by Alice and Bob is known. In
particular, we consider the six state protocol with symmetric eavesdropping
attacks, and show that for a small number of signals, i.e. below the order of
10^4, the finite key rate differs significantly from the asymptotic value for n
approaching infinity. However, for larger n, a good approximation of the
asymptotic value is found. We also study secret key rates for protocols using
higher-dimensional quantum systems.

7
The categories of this paper are: hep-th
36
The categories of this paper are: cmp-lg
37
The categories of this paper are: supr-con
23
The categories of this paper are: solv-int
9
The categories of this paper are: nlin
28
The categories of this paper are: alg-geom
31
The categories of this paper are: ao-sci
30
The categories of this paper are: q-alg
10
The categories of this paper are: q-bio
20
The categories of this paper are: acc-phys
25
The categories of this paper are: patt-sol
29
The categories of this paper are: funct-an
21
The categories of this paper are: adap-org
1
The categories of this paper are: cs
15
The categories of this paper are: nucl-ex
17
The categories of this paper are: q-fin