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A: Fachverband Atomphysik
A 30: Precision Measurements and Metrology II (joint session Q/A)
A 30.1: Poster
Donnerstag, 17. März 2022, 16:30–18:30, P
Experimental and theoretical investigations for an all optical coherent quantum noise cancellation scheme — •Bernd Schulte1,2, Jonas Junker1,2, Mariia Matiushechkina1,2,3, Roman Kossak1,2, Nived Johny1,2, and Michèle Heurs1,2,3 — 1Max Planck Institute for Gravitational Physics and Institute for Gravitational Physics, Hannover, Germany — 2Quantum Frontiers — 3PhoenixD
Optomechanical detectors can and have been used successfully for the ultra-precise measurement of weak forces. The sensitivity of such detectors is limited by the standard quantum limit (SQL) which is defined by the shot noise of the probe beam and the quantum radiation pressure back action noise. To surpass the SQL Tsang and Caves suggested a scheme [1] with an anti-noise (ancilla cavity) path which is coupled to the measurement device (meter cavity) to destructively interfere the radiation pressure back action noise. In this scheme the anti-noise path contains a two-mode squeezer and a beam splitter interaction. To achieve perfect coherent quantum noise cancellation (CQNC), exact matching of the respective coupling strengths is required. Additionally, the linewidths of the ancilla cavity and mechanical oscillator needs to be matched and the ancilla cavity needs to be sideband-resolved. Our group has conducted a detailed analysis of the proposed method under experimentally feasible conditions and has shown that even for non-perfect matching one can surpass the SQL [2].
[1] M. Tsang and C. Caves, Phys. Rev. Lett. 105, 123601, (2010)
[2] M. H. Wimmer et al, Phys. Rev. A 89, 053836 (2014)