Issue 26, 2022

Topology detection in cavity QED

Abstract

We explore the physics of topological lattice models immersed in c-QED architectures for arbitrary coupling strength with the photon field. We propose the use of the cavity transmission as a topological marker and study its behaviour. For this, we develop an approach combining the input–output formalism with a Mean-Field plus fluctuations description of the setup. We illustrate our results with the specific case of a fermionic Su–Schrieffer–Heeger (SSH) chain coupled to a single-mode cavity. Our findings confirm that the cavity can indeed act as a quantum sensor for topological phases, where the initial state preparation plays a crucial role. Additionally, we discuss the persistence of topological features when the coupling strength increases, in terms of an effective Hamiltonian, and calculate the entanglement entropy. Our approach can be applied to other fermionic systems, opening a route to the characterization of their topological properties in terms of experimental observables.

Graphical abstract: Topology detection in cavity QED

Supplementary files

Article information

Article type
Paper
Submitted
19 4 2022
Accepted
17 6 2022
First published
17 6 2022
This article is Open Access
Creative Commons BY license

Phys. Chem. Chem. Phys., 2022,24, 15860-15870

Topology detection in cavity QED

B. Pérez-González, Á. Gómez-León and G. Platero, Phys. Chem. Chem. Phys., 2022, 24, 15860 DOI: 10.1039/D2CP01806C

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