Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Characterization and measurement of qubit-environment entanglement
  generation during pure dephasing   We consider the coupling of a qubit in a pure state to an environment in an
arbitrary state, and characterize the possibility of qubit-environment
entanglement generation during the evolution of the joint system, that leads to
pure dephasing of the qubit. We give a simple necessary and sufficient
condition on the initial density matrix of the environment together with the
properties of the interaction, for appearance of qubit-environment
entanglement. Any entanglement created turns out to be detectable by the
Peres-Horodecki criterion. Furthermore, we show that for a large family of
initial environmental states, the appearance of nonzero entanglement with the
environment is necessarily accompanied by a change in the state of the
environment (i.e. by the back-action of the qubit).

14
The categories of this paper are: math-ph
22
The categories of this paper are: chao-dyn
15
The categories of this paper are: nucl-ex
24
The categories of this paper are: dg-ga
30
The categories of this paper are: q-alg
29
The categories of this paper are: funct-an
23
The categories of this paper are: solv-int
18
The categories of this paper are: econ
2
The categories of this paper are: math
3
The categories of this paper are: physics
36
The categories of this paper are: cmp-lg
9
The categories of this paper are: nlin
26
The categories of this paper are: bayes-an
19
The categories of this paper are: eess
5
The categories of this paper are: gr-qc
16
The categories of this paper are: stat