Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Collectively enhanced high-power and high-capacity charging of quantum
  batteries via quantum heat engines   As a model of so-called quantum battery (QB), quantum degrees of freedom as
energy storage, we study a charging protocol of a many-body QB consisting of
$N$ two-level systems (TLSs) using quantum heat engines (QHEs). We focus on the
collective enhancement effects in the charging performance of QBs in comparison
to the individual charging. It is a challenging goal of QBs to achieve large
collective enhancements in the charging power and the capacity while keeping
the experimental feasibility, the stability, and the cheapness of the required
control and resources. We show that our model actually exhibits these features.
In fact, our protocol simultaneously achieves the asymptotically-perfect charge
and almost $N$-order average power enhancement with only thermal energy
resource and simple local interactions in a stable manner. The capacity is
collectively enhanced due to the emergent bosonic quantum statistics caused by
the symmetry of the interaction between the engine and the batteries, which
results in asymptotically perfect excitation of all the TLSs. The charging
speed, and hence the average power are collectively enhanced by the
superradiance-like cooperative excitation in the effective negative
temperature. Our results suggest that QHEs actually fit for a charger of QBs,
efficiently exploiting the collective enhancements, not only converting the
disordered thermal energy to the ordered energy stored in quantum degrees of
freedom.

3
The categories of this paper are: physics
25
The categories of this paper are: patt-sol
15
The categories of this paper are: nucl-ex
20
The categories of this paper are: acc-phys
31
The categories of this paper are: ao-sci
19
The categories of this paper are: eess
22
The categories of this paper are: chao-dyn
21
The categories of this paper are: adap-org
1
The categories of this paper are: cs
8
The categories of this paper are: hep-ex
10
The categories of this paper are: q-bio
7
The categories of this paper are: hep-th
0
The categories of this paper are: hep-ph
29
The categories of this paper are: funct-an
28
The categories of this paper are: alg-geom
30
The categories of this paper are: q-alg