Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Continuous Variable Quantum Cryptography - beating the 3 dB loss limit   We demonstrate that secure quantum key distribution systems based on
continuous variables implementations can operate beyond the apparent 3 dB loss
limit that is implied by the beam splitting attack . The loss limit was
established for standard minimum uncertainty states such as coherent states. We
show that by an appropriate postselection mechanism we can enter a region where
Eve's knowledge falls behind the information shared between Alice and Bob even
in the presence of substantial losses.

34
The categories of this paper are: chem-ph
12
The categories of this paper are: nucl-th
33
The categories of this paper are: plasm-ph
14
The categories of this paper are: math-ph
35
The categories of this paper are: mtrl-th
26
The categories of this paper are: bayes-an
9
The categories of this paper are: nlin
0
The categories of this paper are: hep-ph
8
The categories of this paper are: hep-ex
29
The categories of this paper are: funct-an
5
The categories of this paper are: gr-qc
28
The categories of this paper are: alg-geom
3
The categories of this paper are: physics
15
The categories of this paper are: nucl-ex
32
The categories of this paper are: atom-ph
36
The categories of this paper are: cmp-lg