Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Are quantum thermodynamic machines better than their classical
  counterparts?   Interesting effects arise in cyclic machines where both heat and ergotropy
transfer take place between the energising bath and the system (the working
fluid). Such effects correspond to unconventional decompositions of energy
exchange between the bath and the system into heat and work, respectively,
resulting in efficiency bounds that may surpass the Carnot efficiency. However,
these effects are not directly linked with quantumness, but rather with heat
and ergotropy, the likes of which can be realised without resorting to quantum
mechanics.

6
The categories of this paper are: astro-ph
25
The categories of this paper are: patt-sol
27
The categories of this paper are: comp-gas
2
The categories of this paper are: math
34
The categories of this paper are: chem-ph
29
The categories of this paper are: funct-an
8
The categories of this paper are: hep-ex
21
The categories of this paper are: adap-org
1
The categories of this paper are: cs
18
The categories of this paper are: econ
15
The categories of this paper are: nucl-ex
20
The categories of this paper are: acc-phys
11
The categories of this paper are: hep-lat
23
The categories of this paper are: solv-int
24
The categories of this paper are: dg-ga
22
The categories of this paper are: chao-dyn