SAMOP 2021 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 7: Precision Measurements
Q 7.6: Poster
Dienstag, 21. September 2021, 16:30–18:30, P
A Quantum Optical Microphone in the Audio Band — •Raphael Nold1, Charles Babin1, Joel Schmidt1, Tobias Linkewitz1, Mária Pérez Zaballos2, Rainer Stöhr1, Roman Kolesov1, Vadim Vorobev1, Daniil Lukin3, Rüdiger Boppert4, Stefanie Barz1, Jelena Vuckovic3, Christof Gebhardt5, Florian Kaiser1, and Jörg Wrachtrup1 — 1University of Stuttgart, Germany — 2Cambridge University, UK — 3Stanford University, USA — 4Olgahospital Stuttgart, Germany — 5Ulm University, Germany
The ability to perform high-precision optical measurements is paramount to science and engineering. Especially laser interferometry enables interaction-free sensing in which precision is ultimately limited by shot noise. Quantum optical enhanced sensors can surpass this limit. We introduce a novel cavity-free nonlinear interferometer that achieves sub-shot noise performance in continuous operation. We combine the advantages of low parametric gain operation and post selection free difference intensity detection with common mode noise cancellation. This allows us to measure phase-shifts more than four orders of magnitude faster compared to previous experiments based on photon number states. Further we present the implementation of a complex application as a quantum microphone in the audio band (frequency range 200 − 20,000 Hz). Recordings of both, the quantum sensor and an equivalent classical counterpart are benchmarked with a medically-approved speech recognition test, which shows that the quantum sensor leads to a by 0.29 dB reduced speech recognition threshold. We thus make the quantum advantage audible to humans.