Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum cloning optimal for joint measurements   We show that universally covariant cloning is not optimal for achieving joint
measurements of noncommuting observables with minimum added noise. For such a
purpose a cloning transformation that is covariant with respect to a restricted
transformation group is needed.

36
The categories of this paper are: cmp-lg
1
The categories of this paper are: cs
6
The categories of this paper are: astro-ph
16
The categories of this paper are: stat
12
The categories of this paper are: nucl-th
33
The categories of this paper are: plasm-ph
32
The categories of this paper are: atom-ph
24
The categories of this paper are: dg-ga
3
The categories of this paper are: physics
34
The categories of this paper are: chem-ph
35
The categories of this paper are: mtrl-th
4
The categories of this paper are: cond-mat
30
The categories of this paper are: q-alg
8
The categories of this paper are: hep-ex
28
The categories of this paper are: alg-geom
29
The categories of this paper are: funct-an