Exotic interactions mediated by a non-Hermitian photonic bath
- URL: http://arxiv.org/abs/2109.13255v2
- Date: Thu, 19 May 2022 09:02:17 GMT
- Title: Exotic interactions mediated by a non-Hermitian photonic bath
- Authors: Federico Roccati, Salvatore Lorenzo, Giuseppe Calaj\`o, G. Massimo
Palma, Angelo Carollo, Francesco Ciccarello
- Abstract summary: We study the exotic interaction between emitters mediated by the photonic modes of a lossy photonic lattice.
We show in a paradigmatic case study that structured losses in the field can seed exotic emission properties.
These findings introduce a new paradigm of light-mediated interactions with unprecedented features.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Photon-mediated interactions between quantum emitters in engineered photonic
baths is an emerging area of quantum optics. At the same time, non-Hermitian
(NH) physics is currently thriving, spurred by the exciting possibility to
access new physics in systems ruled by non-trivial NH Hamiltonians - in
particular photonic lattices - which can challenge longstanding tenets such as
the Bloch theory of bands. Here, we combine these two fields and study the
exotic interaction between emitters mediated by the photonic modes of a lossy
photonic lattice described by a NH Hamiltonian. We show in a paradigmatic case
study that structured losses in the field can seed exotic emission properties.
Photons can mediate dissipative, fully non-reciprocal, interactions between the
emitters with range critically dependent on the loss rate. When this loss rate
corresponds to a bare-lattice exceptional point, the effective couplings are
exactly nearest-neighbour, implementing a dissipative, fully non-reciprocal,
Hatano-Nelson model. Counter-intuitively, this occurs irrespective of the
lattice boundary conditions. Thus photons can mediate an effective emitters'
Hamiltonian which is translationally-invariant despite the fact that the field
is not. We interpret these effects in terms of metastable atom-photon dressed
states, which can be exactly localized on only two lattice cells or extended
across the entire lattice. These findings introduce a new paradigm of
light-mediated interactions with unprecedented features such as
non-reciprocity, non-trivial dependence on the field boundary conditions and
range tunability via a loss rate.
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