Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Halting in quantum Turing computation   The paper considers the halting scheme for quantum Turing machines. The
scheme originally proposed by Deutsch appears to be correct, but not exactly as
originally intended. We discuss the result of Ozawa as well as the objections
raised by Myers, Kieu and Danos and others. Finally, the relationship of the
halting scheme to the quest for a universal quantum Turing machine is
considered.

9
The categories of this paper are: nlin
36
The categories of this paper are: cmp-lg
14
The categories of this paper are: math-ph
17
The categories of this paper are: q-fin
2
The categories of this paper are: math
16
The categories of this paper are: stat
7
The categories of this paper are: hep-th
33
The categories of this paper are: plasm-ph
32
The categories of this paper are: atom-ph
0
The categories of this paper are: hep-ph
18
The categories of this paper are: econ
21
The categories of this paper are: adap-org
1
The categories of this paper are: cs
15
The categories of this paper are: nucl-ex
35
The categories of this paper are: mtrl-th
20
The categories of this paper are: acc-phys