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Q: Fachverband Quantenoptik und Photonik
Q 9: Precision Measurements and Metrology II
Q 9.6: Vortrag
Montag, 14. März 2022, 18:00–18:15, Q-H11
Suitable optomechanical oscillators for an all optical coherent quantum noise cancellation epxeriment — •Bernd Schulte1,2, Roman Kossak1,2, Nived Johny1,2, Mariia Matiushechkina1,2,3, and Michèle Heurs1,2,3 — 1Max Planck Institute for Gravitational Physics and Institute for Gravitational Physics, Hannover, Germany — 2Quantum Frontiers — 3PhoenixD
Optomechanical detectors have reached the standard quantum limit in position and force sensing where backaction noise, caused by radiation pressure noise, starts to be the limiting factor for sensitivity. One strategy to circumvent measurement backaction, and surpass the standard quantum limit, has been suggested by M. Tsang and C. Caves [1] and is called Coherent Quantum Noise Cancellation (CQNC). This scheme can be viewed as coupling a second oscillator with an effectively negative mass (see J. Junker) to the one subject to quantum radiation pressure noise and thus realizing a quantum non-demolition measurement. After an introduction of the idea and the requirements for CQNC this talk will be focused on the oscillator susceptible to quantum radiation pressure noise. We discuss and show the measurement principles intended to determine mechanical and optical properties of our devices (membrane-in-the-middle vs. membrane-at-the-end setup). These set-ups could also be used to shift the mechanical properties via the optical spring effect to satisfy CQNC requirements.
[1] M. Tsang and C. Caves, Phys. Rev. Lett. 105 ,123601, 2010.