Berlin 2024 – scientific programme
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QI: Fachverband Quanteninformation
QI 21: Focus Session: Nanomechanical Systems for Classical and Quantum Sensing III (joint session HL/DY/TT/QI)
QI 21.5: Invited Talk
Thursday, March 21, 2024, 11:45–12:15, EW 202
Enhanced cooling efficiency in nonlinear cavity optomechanics — •Anja Metelmann1, Nicolas Diaz-Naufal2, David Zoepfl3, Lukas Deeg3, Christian Schneider3, Mathieu Juan4, and Gerhard Kirchmaier3 — 1Karlsruhe Institute of Technology, Karlsruhe, Germany — 2Free University Berlin, Berlin, Germany — 3University of Innsbruck, Innsbruck, Austria — 4Universite de Sherbrooke, Sherbrooke, Canada
Unlocking the quantum potential of mechanical resonators hinges on achieving ground state cooling, a key milestone for quantum information processing and ultra-precise quantum measurements. In the vibrant field of cavity optomechanics, dynamical backaction cooling and feedback protocols have successfully nudged macroscopic mechanical elements toward the quantum ground state. While linear regime cooling is well-explored, recent theoretical insights suggest that a nonlinear cavity could amplify cooling efficiency. We explore this intriguing nonlinear regime, focusing on the cooling dynamics of a mechanical resonator coupled to a nonlinear cavity, embodying the characteristics of a high-Q Duffing oscillator. In this talk we present a comparative analysis between theoretical predictions and experimental results from a magnetomechanical platform. The findings unveil a captivating enhancement in cooling efficiency attributed to the Duffing nonlinearity. This breakthrough not only enriches our understanding of optomechanical interactions but also holds promise for advancing cooling strategies in quantum technologies.
Keywords: cavity optomechanics; superconducting circuits; quantum measurement