Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum random walks - an introductory overview   This article aims to provide an introductory survey on quantum random walks.
Starting from a physical effect to illustrate the main ideas we will introduce
quantum random walks, review some of their properties and outline their
striking differences to classical walks. We will touch upon both physical
effects and computer science applications, introducing some of the main
concepts and language of present day quantum information science in this
context. We will mention recent developments in this new area and outline some
open questions.

2
The categories of this paper are: math
0
The categories of this paper are: hep-ph
37
The categories of this paper are: supr-con
28
The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
10
The categories of this paper are: q-bio
22
The categories of this paper are: chao-dyn
18
The categories of this paper are: econ
6
The categories of this paper are: astro-ph
24
The categories of this paper are: dg-ga
17
The categories of this paper are: q-fin
32
The categories of this paper are: atom-ph
14
The categories of this paper are: math-ph
34
The categories of this paper are: chem-ph
9
The categories of this paper are: nlin
8
The categories of this paper are: hep-ex