Freiburg 2019 – scientific programme

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FM: Fall Meeting

FM 41: Poster: Quantum Sensing

FM 41.15: Poster

Tuesday, September 24, 2019, 16:30–18:30, Tents

A quantum acousto-optical transducer based on induced coherence without induced emission — •Joel Schmidt, Raphael Nold, Tobias Linkewitz, Florian Kaiser, and Jörg Wrachtrup — 3. Physikalisches Institut, Universität Stuttgart, Stuttgart, Germany

Laser and fibre microphones are amongst the most sensitive sound recording devices. They enable applications such as interaction-free long-range sound recognition and espionage, intestinal medical exams and high-sensitivity hearing-aids. Quantum optical sensors can achieve performance beyond the classical shot noise limit, however, sampling rates are severely limited by the necessity of using photon number resolving detectors (PNRD). Here, we show how to perform quantum-enhanced optical phase sensing using entangled photon pairs that are created via induced coherence without induced emission. This removes the necessity for PNRDs and promises much higher sampling rates. Our goal is to make humans hear the quantum advantage by demonstrating a quantum optical microphone with sub-shot noise performance.