Parts | Days | Selection | Search | Updates | Downloads | Help
Q: Fachverband Quantenoptik und Photonik
Q 6: Quantum Optics (Miscellaneous) I
Q 6.2: Talk
Monday, March 14, 2022, 14:30–14:45, Q-H14
A Quantum Optical Microphone in the Audio Band — •Raphael Nold1,2, Charles Babin1,2, Joel Schmidt1,2, Tobias Linkewitz1,2, Mariá T. Pérez Zaballos3, Rainer Stöhr1,2, Roman Kolesov1,2, Vadim Vorobyov1,2, Daniil M. Lukin4, Rüdiger Boppert5, Stefanie Barz2,6, Jelena Vučković4, Christof M. Gebhardt2,7, Florian Kaiser1,2, and Jörg Wrachtrup1,2 — 13rd Institute of Physics, University of Stuttgart, Stuttgart, Germany — 2Center for Integrated Quantum Science and Technology (IQST), Germany — 3The Old Schools, Cambridge CB2 1TN, Reino Unido , UK — 4Ginzton Laboratory, Stanford University, Stanford, CA, USA — 5Department of Pediatric Audiology and Neurotology, Olgahospital, Stuttgart, Germany — 6Institute for Functional Matter and Quantum Technologies, University of Stuttgart, Stuttgart, Germany — 7Institute of Biophysics, Ulm University, Ulm, Germany
We introduce a easy-to-use nonlinear interferometer, that infers optical phase shifts through intensity measurements and sampling rates up to 100 kHz, while still maintaining a quantum advantage in the measurement precision. Capitalising on this, we present an application as a quantum microphone in the audio band. Recordings of both, the quantum sensor and an equivalent classical counterpart are benchmarked with a medically-approved speech recognition test. The results show that the quantum sensor leads to a by 0.57 dBSPL reduced speech recognition threshold. These results open the door towards applications in quantum nonlinear interferometry, and additionally show that quantum phenomena can be experienced by humans.