Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Temperature-field phase diagrams of one-way quantum work deficit in
  two-qubit XXZ spin systems   The spin-1/2 XXZ chain in a uniform magnetic field at thermal equilibrium is
considered. For this model, we give a complete classification of all
qualitatively different phase diagrams for the one-way quantum work
(information) deficit. The diagrams can contain regions (phases, fractions)
with both stationary and variable (state-dependent) angles of optimal
measurement. We found cases of phase diagrams in which the sizes of regions
with the variable optimal measurement angle are large and perhaps such regions
can be detected experimentally. We also established a relationship between the
behavior of optimal measurement angles near the boundaries separated different
regions and Landau's theory of phase transitions of the second and first kind.

16
The categories of this paper are: stat
19
The categories of this paper are: eess
5
The categories of this paper are: gr-qc
14
The categories of this paper are: math-ph
4
The categories of this paper are: cond-mat
21
The categories of this paper are: adap-org
7
The categories of this paper are: hep-th
2
The categories of this paper are: math
1
The categories of this paper are: cs
27
The categories of this paper are: comp-gas
22
The categories of this paper are: chao-dyn
31
The categories of this paper are: ao-sci
9
The categories of this paper are: nlin
36
The categories of this paper are: cmp-lg
8
The categories of this paper are: hep-ex
10
The categories of this paper are: q-bio