Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measurement and state preparation via ion trap quantum computing   We investigate in detail the effects of a QND vibrational number measurement
made on single ions in a recently proposed measurement scheme for the
vibrational state of a register of ions in a linear rf trap [C. D'Helon and
G.J. Milburn, Phys. Rev. A 54, 5141 (1996)]. The performance of a measurement
shows some interesting patterns which are closely related to searching.

15
The categories of this paper are: nucl-ex
31
The categories of this paper are: ao-sci
28
The categories of this paper are: alg-geom
4
The categories of this paper are: cond-mat
0
The categories of this paper are: hep-ph
11
The categories of this paper are: hep-lat
19
The categories of this paper are: eess
5
The categories of this paper are: gr-qc
29
The categories of this paper are: funct-an
30
The categories of this paper are: q-alg
10
The categories of this paper are: q-bio
18
The categories of this paper are: econ
27
The categories of this paper are: comp-gas
12
The categories of this paper are: nucl-th
36
The categories of this paper are: cmp-lg
3
The categories of this paper are: physics