ConQuMat - TRR360

TRR 360 Seminar: Tba Urban Seifert
2024-12-04 14:00 - 15:00 (Europe/Berlin) | Technical University Munich + Zoom
Tba
Dr. Urban Seifert
TU Dresden

Venue

TRR 360 Seminar: Directional amplification, non-Hermitian topology, and optomechanical realisation of the bosonic Kitaev chain Andreas Nunnenkamp
2024-12-18 14:00 - 15:00
Directional amplification, non-Hermitian topology, and optomechanical realisation of the bosonic Kitaev chain
Prof. Andreas Nunnenkamp
Universität Wien

Directional amplification, in which signals are selectively amplified depending on their propagation direction, has attracted much attention as a key resource for applications, including quantum information processing. I will present a unifying framework based on non-Hermitian topology to understand non-reciprocity and directional amplification in driven-dissipative cavity arrays. Specifically, I will unveil a one-to-one correspondence between a non-zero topological invariant defined on the spectrum of the dynamic matrix and regimes of directional amplification, in which the end-to-end gain grows exponentially with the number of cavities. I will show how to restore the bulk-boundary correspondence for one paradigmatic class of non-Hermitian Hamiltonians. Finally, I will present experiments on a bosonic analog of the fermionic Kitaev chain in an nano-optomechanical network. Our work opens up new avenues in topological photonics and non-Hermitian phases of matter.

C.C. Wanjura, M. Brunelli, and A. Nunnenkamp,
Topological framework for directional amplification in driven-dissipative cavity arrays,
Nat Commun 11, 3149 (2020).
https://doi.org/10.1038/s41467-020-16863-9

M. Brunelli, C.C. Wanjura, and A. Nunnenkamp,
Restoration of the non-Hermitian bulk-boundary correspondence via topological amplification,
SciPost Phys. 15, 173 (2023).
https://scipost.org/10.21468/SciPostPhys.15.4.173

J.J. Slim, C.C. Wanjura, M. Brunelli et al.,
Optomechanical realization of the bosonic Kitaev chain,
Nature 627, 767 (2024).
https://doi.org/10.1038/s41586-024-07174-w

Venue
