Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the information-splitting essence of two types of quantum key
  distribution protocols   With the help of a simple quantum key distribution (QKD) scheme, we discuss
the relation between BB84-type protocols and two-step-type ones. It is shown
that they have the same essence, i.e., information-splitting. More
specifically, the similarity between them includes (1) the carrier state is
split into two parts which will be sent one by one; (2) the possible states of
each quantum part are indistinguishable; (3) anyone who obtains both parts can
recover the initial carrier state and then distinguish it from several possible
states. This result is useful for related scheme designing and security
analyzing.

18
The categories of this paper are: econ
7
The categories of this paper are: hep-th
32
The categories of this paper are: atom-ph
5
The categories of this paper are: gr-qc
10
The categories of this paper are: q-bio
6
The categories of this paper are: astro-ph
33
The categories of this paper are: plasm-ph
21
The categories of this paper are: adap-org
0
The categories of this paper are: hep-ph
11
The categories of this paper are: hep-lat
26
The categories of this paper are: bayes-an
23
The categories of this paper are: solv-int
17
The categories of this paper are: q-fin
8
The categories of this paper are: hep-ex
4
The categories of this paper are: cond-mat
27
The categories of this paper are: comp-gas