Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Non-Hermitian heat engine with all-quantum-adiabatic-process cycle   As a quantum device, a quantum heat engine (QHE) is described by a Hermitian
Hamiltonian.However, since it is an open system, reservoirs have to be imposed
phenomenologically without any description in the context of quantum mechanics.
A non-Hermitian system is expected to describe an open system which exchanges
energy and particles with external reservoirs. Correspondingly,such an exchange
can be adiabatic in the context of quantum mechanics. We first propose a
non-Hermitian QHE by a concrete simple two-level system, which is an S = 1/2
spin in a complex external magnetic field. The non-Hermitian PT -symmetric
Hamiltonian, as a self-contained one,describes both working medium and
reservoirs. A heat-engine cycle is composed of completely quantum adiabatic
processes. Surprisingly, the heat efficiency is obtained to be the same as that
of Hermitian quantum Otto cycle. A classical analogue of this scheme is also
presented. Our finding paves the way for revealing what the role of a
non-Hermitian Hamiltonian plays in physics.

18
The categories of this paper are: econ
11
The categories of this paper are: hep-lat
10
The categories of this paper are: q-bio
0
The categories of this paper are: hep-ph
16
The categories of this paper are: stat
33
The categories of this paper are: plasm-ph
22
The categories of this paper are: chao-dyn
37
The categories of this paper are: supr-con
8
The categories of this paper are: hep-ex
12
The categories of this paper are: nucl-th
20
The categories of this paper are: acc-phys
19
The categories of this paper are: eess
31
The categories of this paper are: ao-sci
15
The categories of this paper are: nucl-ex
34
The categories of this paper are: chem-ph
29
The categories of this paper are: funct-an