Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Relation between strength of interaction and accuracy of measurement for
  a quantum measurement   The process of measuring a two-level quantum system was examined by applying
Hamiltonian formalism. For the measurement of an observable that does not
commute with the system Hamiltonian, a non-trivial relationship among the
strength of interaction, the time interval of the process, and the accuracy of
the measurement was obtained. Particularly, to achieve an error-free
measurement of such an observable, a condition stating that the interaction
Hamiltonian does not commute with the system Hamiltonian needs to be satisfied.

23
The categories of this paper are: solv-int
26
The categories of this paper are: bayes-an
12
The categories of this paper are: nucl-th
19
The categories of this paper are: eess
33
The categories of this paper are: plasm-ph
15
The categories of this paper are: nucl-ex
6
The categories of this paper are: astro-ph
34
The categories of this paper are: chem-ph
32
The categories of this paper are: atom-ph
28
The categories of this paper are: alg-geom
3
The categories of this paper are: physics
30
The categories of this paper are: q-alg
27
The categories of this paper are: comp-gas
16
The categories of this paper are: stat
36
The categories of this paper are: cmp-lg
14
The categories of this paper are: math-ph