Hannover 2020 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 28: Precision Measurements and Metrology (Gravity)
Q 28.1: Talk
Wednesday, March 11, 2020, 11:00–11:15, f435
Fundamental investigation of micro-optomechanical devices for quantum measurements — •Mariia Matiushechkina1,2,3,4, Bernd Schulte1,2,3, Roman Kossak1,2, and Michèle Heurs1,2,3,4 — 1Leibniz Universität Hannover, Institut für Gravitationsphysik — 2Max Planck Institut für Gravitationsphysik — 3QuantumFrontiers — 4PhoenixD
The sensitivity of future generations of gravitational wave detectors (GWDs) is limited by quantum fluctuations. Quantum Radiation Pressure Noise (RPN) will soon limit the low-frequency sensitivity of interferometric GWDs. A proposed technique to reduce quantum RPN is called Coherent Quantum Noise Cancellation (CQNC) where a tailored quantum state of light couples to a mechanical system. A table-top realisation of the experiment helps to improve and investigate different parts of the set-up. It is essential to understand the basic principles of operation of the optomechanical devices to be able to modify and implement them properly in precise quantum measurements. Other noise sources, such as thermal noise, can mask quantum RPN. The realisation of their origin and numerical calculation of their power spectral densities will make it possible to reduce their influence on the optomechanical system. To model the system and to simulate applied forces, changes in temperature and initial conditions we use COMSOL Multiphysics software based on a Finite Element Method (FEM). We present our investigations into topology, mechanical properties, thermal and optical effects in the high-Q Si3N4 membranes for implementation in quantum noise cancellation experiments.