Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Decay of quantumness in a measurement process: Action of a
  coarse-graining channel   A model of a quantum measurement process is presented: a system consisting of
a qubit in a superposition interacts with a measuring apparatus consisting of a
N qubit state. Looking at the emerging, effective description of the apparatus
given by the action of a coarse-graining channel, we have been able to recover
information about the superposition coefficients of the system.We have also
been able to visualize the death of quantum correlations between system and
apparatus and the death of quantum coherences in the apparatus' effective
state, in the limit of a strong coarse-graining action - a situation akin to
decoherence, although it is not necessary to evoke any interaction with the
surrounding environment.

10
The categories of this paper are: q-bio
22
The categories of this paper are: chao-dyn
37
The categories of this paper are: supr-con
7
The categories of this paper are: hep-th
28
The categories of this paper are: alg-geom
6
The categories of this paper are: astro-ph
12
The categories of this paper are: nucl-th
8
The categories of this paper are: hep-ex
26
The categories of this paper are: bayes-an
23
The categories of this paper are: solv-int
17
The categories of this paper are: q-fin
9
The categories of this paper are: nlin
27
The categories of this paper are: comp-gas
20
The categories of this paper are: acc-phys
25
The categories of this paper are: patt-sol
4
The categories of this paper are: cond-mat