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DTSTART;TZID=Europe/Berlin:20241204T140000
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DTSTAMP:20260502T142342
CREATED:20241122T165404Z
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SUMMARY:TRR 360 Seminar: Tba Urban Seifert
DESCRIPTION:Tba \nDr. Urban Seifert \nTU Dresden \n  \n\n\n\n\n\n\nVenue
URL:https://www.trr360.de/event/trr-360-seminar-tba-urban-seifert/
LOCATION:Technical University Munich + Zoom
CATEGORIES:Seminar
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DTSTART;TZID=Europe/Berlin:20241218T140000
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CREATED:20241122T165601Z
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UID:4439-1734530400-1734534000@www.trr360.de
SUMMARY:TRR 360 Seminar: Directional amplification\, non-Hermitian topology\, and optomechanical realisation of the bosonic Kitaev chain Andreas Nunnenkamp
DESCRIPTION:Directional amplification\, non-Hermitian topology\, and optomechanical realisation of the bosonic Kitaev chain \nProf. Andreas Nunnenkamp \nUniversität Wien \n\nDirectional 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.\n \nC.C. Wanjura\, M. Brunelli\, and A. Nunnenkamp\,\nTopological framework for directional amplification in driven-dissipative cavity arrays\,\nNat Commun 11\, 3149 (2020).\nhttps://doi.org/10.1038/s41467-020-16863-9\n \nM. Brunelli\, C.C. Wanjura\, and A. Nunnenkamp\,\nRestoration of the non-Hermitian bulk-boundary correspondence via topological amplification\,\nSciPost Phys. 15\, 173 (2023).\nhttps://scipost.org/10.21468/SciPostPhys.15.4.173\n \nJ.J. Slim\, C.C. Wanjura\, M. Brunelli et al.\,\nOptomechanical realization of the bosonic Kitaev chain\,\nNature 627\, 767 (2024).\nhttps://doi.org/10.1038/s41586-024-07174-w\n\n\n\n\n\n\n\nVenue
URL:https://www.trr360.de/event/trr-360-seminar-tba-andreas-nunnenkamp/
LOCATION:Technical University Munich + Zoom
CATEGORIES:Seminar
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