Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Key rate available from mismatched mesurements in the BB84 protocol and
  the uncertainty principle   We consider the mismatched measurements in the BB84 quantum key distribution
protocol, in which measuring bases are different from transmitting bases. We
give a lower bound on the amount of a secret key that can be extracted from the
mismatched measurements. Our lower bound shows that we can extract a secret key
from the mismatched measurements with certain quantum channels, such as the
channel over which the Hadamard matrix is applied to each qubit with high
probability. Moreover, the entropic uncertainty principle implies that one
cannot extract the secret key from both matched measurements and mismatched
ones simultaneously, when we use the standard information reconciliation and
privacy amplification procedure.

28
The categories of this paper are: alg-geom
15
The categories of this paper are: nucl-ex
24
The categories of this paper are: dg-ga
2
The categories of this paper are: math
5
The categories of this paper are: gr-qc
10
The categories of this paper are: q-bio
29
The categories of this paper are: funct-an
6
The categories of this paper are: astro-ph
26
The categories of this paper are: bayes-an
25
The categories of this paper are: patt-sol
12
The categories of this paper are: nucl-th
1
The categories of this paper are: cs
9
The categories of this paper are: nlin
37
The categories of this paper are: supr-con
20
The categories of this paper are: acc-phys
17
The categories of this paper are: q-fin