Orateur : Dr. Salambô Dago

Vienna Center for Quantum Science and Technology (VCQ) University of Vienna)

Résumé : Feedback control provides a versatile tool for manipulating nanoscale systems dominated by thermal or quantum fluctuations. We present two experimental applications of feedback to explore non equilibrium physics. First, we demonstrate how a feedback loop can create a virtual double potential for an underdamped micromechanical oscillator, enabling a 1-bit memory platform to perform fast logical operations and investigate the energetic cost of information processing [1-5].
Second, we introduce FLIP (Feedback Stabilization on an Inverted Potential), a novel feedback scheme combining Kalman filtering with optical trapping to achieve quantum control [6] and ground-state cooling of levitated nanospheres. This approach allows stable levitation in a double-well configuration while mitigating absorption, opening new routes for optical manipulation at the quantum limit [7].

[1] S. Dago, J. Pereda, S. Ciliberto, and L. Bellon,. JSTAT, 2022(5):053209, (2022).
[2] S. Dago, J. Pereda, N. Barros, S. Ciliberto, and L. Bellon, Phys. Rev. Lett., 126:170601 (2021).
[3] S. Dago, and L. Bellon, Phys. Rev. Lett., 128, 070604 (2022)
[4] S. Dago, L. Bellon, Phys. Rev. E 108, L022101 (2023)
[5] S. Dago, S. Ciliberto and L. Bellon, PNAS Vol.120, No 39
[6] L. Magrini, P. Rosenzweig, C. Bach, A. Deutschmann-Olek, S. G. Hofer, S. Hong, N. Kiesel, A. Kugi
Nature 595, 373 (2021).
[7] S. Dago, J. Rieser, M. Ciampini, V. Mlynar, M. Aspelmeyer, A. Deutschmann-Olek et N. Kiesel Optics
Express 32, 45133-45141 (2024

Contact : Cyriaque Genet
genet@unistra.fr / 03 68 85 51 96