Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum system identification   We formulate and study, in general terms, the problem of quantum system
identification, i.e., the determination (or estimation) of unknown quantum
channels through their action on suitably chosen input density operators. We
also present a quantitative analysis of the worst-case performance of these
schemes.

15
The categories of this paper are: nucl-ex
5
The categories of this paper are: gr-qc
29
The categories of this paper are: funct-an
26
The categories of this paper are: bayes-an
11
The categories of this paper are: hep-lat
0
The categories of this paper are: hep-ph
10
The categories of this paper are: q-bio
32
The categories of this paper are: atom-ph
33
The categories of this paper are: plasm-ph
17
The categories of this paper are: q-fin
23
The categories of this paper are: solv-int
37
The categories of this paper are: supr-con
12
The categories of this paper are: nucl-th
27
The categories of this paper are: comp-gas
9
The categories of this paper are: nlin
6
The categories of this paper are: astro-ph