Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The energetic cost of work extraction   We analyze work extraction from a qubit into a wave guide (WG) acting as a
battery, where work is the coherent component of the energy radiated by the
qubit. The process is stimulated by a wave packet whose mean photon number (the
battery's charge) can be adjusted. We show that the extracted work is bounded
by the qubit's ergotropy, and that the bound is saturated for a large enough
battery's charge. If this charge is small, work can still be extracted. Its
amount is controlled by the quantum coherence initially injected in the qubit's
state, that appears as a key parameter when energetic resources are limited.
This new and autonomous scenario for the study of quantum batteries can be
implemented with state-of-the-art artificial qubits coupled to WGs.

7
The categories of this paper are: hep-th
4
The categories of this paper are: cond-mat
26
The categories of this paper are: bayes-an
34
The categories of this paper are: chem-ph
12
The categories of this paper are: nucl-th
20
The categories of this paper are: acc-phys
8
The categories of this paper are: hep-ex
28
The categories of this paper are: alg-geom
24
The categories of this paper are: dg-ga
5
The categories of this paper are: gr-qc
32
The categories of this paper are: atom-ph
6
The categories of this paper are: astro-ph
37
The categories of this paper are: supr-con
30
The categories of this paper are: q-alg
3
The categories of this paper are: physics
0
The categories of this paper are: hep-ph