Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum measurements with a quantum computer   We present a scheme in which an ion trap quantum computer can be used to make
arbitrarily accurate measurements of the quadrature phase variables for the
collective vibrational motion of the ion. The electronic states of the ion
become the `apparatus', and the method is based on regarding the `apparatus' as
a quantum computer register which can be prepared in appropriate states by
running a Fourier transform algorithm on the data stored within it. The
resolution of the measurement rises exponentially with the number of ions used.

12
The categories of this paper are: nucl-th
0
The categories of this paper are: hep-ph
3
The categories of this paper are: physics
29
The categories of this paper are: funct-an
14
The categories of this paper are: math-ph
15
The categories of this paper are: nucl-ex
21
The categories of this paper are: adap-org
35
The categories of this paper are: mtrl-th
23
The categories of this paper are: solv-int
36
The categories of this paper are: cmp-lg
17
The categories of this paper are: q-fin
6
The categories of this paper are: astro-ph
32
The categories of this paper are: atom-ph
24
The categories of this paper are: dg-ga
27
The categories of this paper are: comp-gas
7
The categories of this paper are: hep-th