Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Non-Hermitian dynamics without dissipation in quantum systems   Models based on non-Hermitian Hamiltonians can exhibit a range of surprising
and potentially useful phenomena. Physical realizations typically involve
couplings to sources of incoherent gain and loss; this is problematic in
quantum settings, because of the unavoidable fluctuations associated with this
dissipation. Here, we present several routes for obtaining unconditional
non-Hermitian dynamics in non-dissipative quantum systems. We exploit the fact
that quadratic bosonic Hamiltonians that do not conserve particle number give
rise to non-Hermitian dynamical matrices. We discuss the nature of these
mappings from non-Hermitian to Hermitian Hamiltonians, and explore applications
to quantum sensing, entanglement dynamics and topological band theory. The
systems we discuss could be realized in a variety of photonic and phononic
platforms using the ubiquitous resource of parametric driving.

12
The categories of this paper are: nucl-th
21
The categories of this paper are: adap-org
16
The categories of this paper are: stat
19
The categories of this paper are: eess
6
The categories of this paper are: astro-ph
15
The categories of this paper are: nucl-ex
1
The categories of this paper are: cs
31
The categories of this paper are: ao-sci
8
The categories of this paper are: hep-ex
20
The categories of this paper are: acc-phys
17
The categories of this paper are: q-fin
7
The categories of this paper are: hep-th
23
The categories of this paper are: solv-int
9
The categories of this paper are: nlin
34
The categories of this paper are: chem-ph
35
The categories of this paper are: mtrl-th