Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Collective heat capacity for quantum thermometry and quantum engine
  enhancements   The performances of quantum thermometry in thermal equilibrium together with
the output power of certain class of quantum engines share a common
characteristic: both are determined by the heat capacity of the probe or
working medium. After noticing that the heat capacity of spin ensembles can be
significantly modified by collective coupling with a thermal bath, we build on
the above observation to investigate the respective impact of such collective
effect on quantum thermometry and quantum engines. We find that the precision
of the temperature estimation is largely increased at high temperatures,
reaching even the Heisenberg scaling - inversely proportional to the number of
spins. For Otto engines operating close to the Carnot efficiency, collective
coupling always enhances the output power. Some tangible experimental platforms
are suggested.

32
The categories of this paper are: atom-ph
10
The categories of this paper are: q-bio
16
The categories of this paper are: stat
28
The categories of this paper are: alg-geom
26
The categories of this paper are: bayes-an
24
The categories of this paper are: dg-ga
17
The categories of this paper are: q-fin
14
The categories of this paper are: math-ph
2
The categories of this paper are: math
21
The categories of this paper are: adap-org
29
The categories of this paper are: funct-an
35
The categories of this paper are: mtrl-th
7
The categories of this paper are: hep-th
9
The categories of this paper are: nlin
22
The categories of this paper are: chao-dyn
34
The categories of this paper are: chem-ph