Plenary sessions

Adaptive Youla-Kucera Parametrization for Active Vibration and Noise Atte

by Dr. Ioan D. Landau, (To read the biography, please put the mouse cursor on the photo)
GIPSA-LAB, Grtenoble, France,

Noise and vibration attenuation is a growing concern in today’s human activities. Passive attenuation of noise and vibration via dedicated absorbers has serious limitations. To fully answer the current problem of noise and vibration attenuation, active control solutions should be considered. A significant difficulty arises as a consequence of large environmental uncertainties in terms of characteristics and variability of the noise and vibrations to be attenuated. New control paradigms emerged for solving these problems.

Adaptive Youla-Kucera parametrization plays a fundamental role in solving the problem of attenuation of noise and vibrations with unknown and time-varying characteristics. This concerns both attenuation by feedback (for multiple tonal and narrow band noise and vibrations) as well as the feedforward compensation when an image of the disturbing noise or vibration is available (structure used for the attenuation of broad band noise or vibrations).

The talk will review some basic algorithms and will emphasize the advantages of using adaptive Youla-Kucera parametrization. The performance of these algorithms will be illustrated by experimental results in active vibration and noise attenuation..

Quantum error correction and stabilisation with quantum controllers

by Prof. Pierre Rouchon (To read the biography, please put the mouse cursor on the photo)

Centre Automatique et Systèmes (CAS), MINES ParisTech, Université PSL, 75006 Paris, France.
Quantic Team, INRIA Paris, 75012 Paris, France.

Quantum Error Correction (QEC) usually involves a static-output feedback. It corresponds to a measurement based-feedback where the controller is a classical system. QEC can also rely on dissipation/decoherence engineering. It includes then a stabilizing feedback scheme where the controller is a quantum system with decoherence. This lecture focuses on the design of such autonomous quantum controllers. The dynamical models either in open-loop or in closed-loop are quantum master equations (Gorini–Kossakowski–Sudarshan–Lindblad equations) governing the time evolution of quantum states (density operators replacing, for open quantum systems, wave functions). Design and convergence analysis are based on averaging techniques (rotating wave approximations) and singular perturbations methods (adiabatic elimination). The specific and important case where the controller is a damped quantum harmonic oscillator (low-quality mode) coherently coupled to the system storing quantum information is detailed. Such autonomous feedback schemes are (and will be) exploited in super-conducting quantum circuits to protect quantum states stored in harmonic oscillators (bosonic codes with cat-qubits and grid-states)

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