Quantum 2025 – scientific programme
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WED-ID: Industry Day
WED-ID 7: Quantum Enabling II
WED-ID 7.3: Talk
Wednesday, September 10, 2025, 16:00–16:20, ZHG104
Squeezed Light for Quantum Sensing — •Axel Schönbeck1, Jan Südbeck1, Jascha Zander1, and Roman Schnabel2 — 1Noisy Labs GmbH, Luruper Hauptstrasse 1, 22547 Hamburg — 2Universität Hamburg, Institut für Quantenphysik, Luruper Chaussee 149, 22761 Hamburg
High-precision laser-based measurements are often limited by photon shot noise across various power levels (mW to kW). Conventionally, the signal-to-noise ratio has been enhanced by increasing the optical power.
However, this approach can introduce undesirable side effects. Biological samples may be damaged or exhibit photo-bleaching and delicate mechanical devices may experience thermal effects. Thermal lensing, induced by high power, can misalign measurement devices. Moreover, exceeding eye-safe laser power levels necessitates additional laser safety measures. Economic considerations, including development and energy costs, can also limit the feasibility of power increases.
Squeezed light offers an alternative solution by reducing photon shot noise without significantly increasing the optical power. Noise reductions exceeding a factor of 10 are achievable when detecting most of the light. Gravitational-wave detection is a prominent example for the application of squeezed light.
This presentation will discuss squeezed light technology and its applications in high-precision quantum sensing.
Keywords: Squeezed Light; Quantum Sensing; Photon Shot Noise; Interferometry; Balanced Detection