Non-Hermitian Waveguide Cavity QED with Tunable Atomic Mirrors
- URL: http://arxiv.org/abs/2304.12897v2
- Date: Tue, 12 Sep 2023 03:53:02 GMT
- Title: Non-Hermitian Waveguide Cavity QED with Tunable Atomic Mirrors
- Authors: Wei Nie, Tao Shi, Yu-xi Liu, Franco Nori
- Abstract summary: We study an open cavity made of atom-dimer mirrors with a tunable reflection spectrum.
We find that the atomic cavity shows anti-$mathcalPT$ symmetry.
Our work presents a non-Hermitian theory of an anti-$mathcalPT$ atomic cavity.
- Score: 4.98050766876065
- License: http://creativecommons.org/licenses/by-nc-nd/4.0/
- Abstract: Optical mirrors determine cavity properties by means of light reflection.
Imperfect reflection gives rise to open cavities with photon loss. We study an
open cavity made of atom-dimer mirrors with a tunable reflection spectrum. We
find that the atomic cavity shows anti-$\mathcal{PT}$ symmetry. The
anti-$\mathcal{PT}$ phase transition controlled by atomic couplings in mirrors
indicates the emergence of two degenerate cavity supermodes. Interestingly, a
threshold of mirror reflection is identified for realizing strong coherent
cavity-atom coupling. This reflection threshold reveals the criterion of atomic
mirrors to produce a good cavity. Moreover, cavity quantum electrodynamics with
a probe atom shows mirror-tuned properties, including reflection-dependent
polaritons formed by the cavity and probe atom. Our work presents a
non-Hermitian theory of an anti-$\mathcal{PT}$ atomic cavity, which may have
applications in quantum optics and quantum computation.
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