Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum Database Searching by a Single Query   In this paper we give a quantum mechanical algorithm that can search a
database by a single query, when the number of solutions is more than a
quarter. It utilizes modified Grover operator of arbitrary phase.

7
The categories of this paper are: hep-th
0
The categories of this paper are: hep-ph
5
The categories of this paper are: gr-qc
28
The categories of this paper are: alg-geom
9
The categories of this paper are: nlin
8
The categories of this paper are: hep-ex
6
The categories of this paper are: astro-ph
37
The categories of this paper are: supr-con
18
The categories of this paper are: econ
15
The categories of this paper are: nucl-ex
36
The categories of this paper are: cmp-lg
21
The categories of this paper are: adap-org
22
The categories of this paper are: chao-dyn
4
The categories of this paper are: cond-mat
11
The categories of this paper are: hep-lat
26
The categories of this paper are: bayes-an