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QI: Fachverband Quanteninformation

QI 20: Focus Session: Nanomechanical Systems for Classical and Quantum Sensing II (joint session HL/DY/TT/QI)

QI 20.1: Talk

Wednesday, March 20, 2024, 15:00–15:15, EW 202

Quantum backaction evasion in cavity magnomechanics — •Victor Augusto Sant Anna V Bittencourt¹, Clinton A. Potts², John P. Davis³, and Anja Metelmann^{1, 4, 5} — ¹ISIS (UMR 7006), Universite de Strasbourg, 67000 Strasbourg, France — ²Kavli Institute of NanoScience, Delft University of Technology, PO Box 5046, 2600 GA Delft, Netherlands — ³Department of Physics, University of Alberta, Edmonton, Alberta T6G 2E9, Canada — ⁴Institute for Theory of Condensed Matter, Karlsruhe Institute of Technology, 76131, Karlsruhe, Germany — ⁵Institute for Quantum Materials and Technology, Karlsruhe Institute of Technology, 76344, Eggenstein-Leopoldshafen, Germany

Magnetic excitations (magnons) hosted in a solid can couple to mechanical vibrations of the material (phonons) via a radiation-pressure like interaction due to magneto-elastic effects. When the magnet is loaded on a microwave cavity, phonons can be driven and measured via the microwave while having the tunability of the magnetic excitations. Nevertheless, the noise added to mechanics can hinders both potential applications of the system at the quantum level and measurements of the phonon mode. Here, we propose a scheme to evade quantum backaction on a phonon mode of a cavity magnomechanical system by using a two-tone microwave drive. We study the robustness of the different possible backaction evading schemes, and show that measurements of the phonon mode can be performed with added noise below the standard quantum limit.

Keywords: Magnomechanics; Backaction; Quantum noise