Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Security of Quantum Key Distribution with Realistic Devices   We simulate quantum key distribution (QKD) experimental setups and give out
some improvement for QKD procedures. A new data post-processing protocol is
introduced, mainly including error correction and privacy amplification. This
protocol combines the ideas of GLLP and the decoy states, which essentially
only requires to turn up and down the source power. We propose a practical way
to perform the decoy state method, which mainly follows the idea of Lo's decoy
state. A new data post-processing protocol is then developed for the QKD scheme
with the decoy state. We first study the optimal expected photon number mu of
the source for the improved QKD scheme. We get the new optimal mu=O(1)
comparing with former mu=O(eta), where eta is the overall transmission
efficiency. With this protocol, we can then improve the key generation rate
from quadratic of transmission efficiency O(eta2) to O(eta). Based on the
recent experimental setup, we obtain the maximum secure transmission distance
of over 140 km.

34
The categories of this paper are: chem-ph
31
The categories of this paper are: ao-sci
23
The categories of this paper are: solv-int
10
The categories of this paper are: q-bio
5
The categories of this paper are: gr-qc
15
The categories of this paper are: nucl-ex
29
The categories of this paper are: funct-an
25
The categories of this paper are: patt-sol
30
The categories of this paper are: q-alg
22
The categories of this paper are: chao-dyn
33
The categories of this paper are: plasm-ph
14
The categories of this paper are: math-ph
28
The categories of this paper are: alg-geom
20
The categories of this paper are: acc-phys
19
The categories of this paper are: eess
26
The categories of this paper are: bayes-an