Hannover 2020 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 22: Posters: Quantum Optics and Photonics II
Q 22.8: Poster
Tuesday, March 10, 2020, 16:30–18:30, Empore Lichthof
High-precision spectroscopy enhanced with squeezed light — •Jonas Junker1,2,3, Dennis Wilken1,2,3, Elanor Huntington4, and Michèle Heurs1,2,3 — 1Max Planck Institute for Gravitational Physics, and Institute for Gravitational Physics, Germany — 2QuantumFrontiers — 3PhoenixD — 4Centre for Quantum Computation & Communication Technology and Research School of Engineering, The Australian National University, Australia
Highly sensitive spectroscopic measurements require suppression of intrinsic noise within the apparatus. At low frequencies, active control can reduce dominant technical noise sources down to the fundamental shot noise limit. In addition to noise reduction, the achieved signal-to-shot-noise ratio can also be improved by increasing the laser power, at least up to the damage threshold of the probe. Here, we demonstrate an alternative approach that improves the signal-to-shot-noise ratio without increasing the laser power. Technical noise sources can be avoided by phase modulating the signal. In order to additionally decrease the shot noise, the signal is superimposed with high-frequency non-classical states of light. The goal is to detect small phase or amplitude signals at kHz frequencies that can be masked by technical noise sources, but also by shot noise. With our approach, we can uncover these signals without increasing the laser power. We present experimental results and the theoretical derivations supporting them. Our proposed technique is interesting for such applications as high-precision cavity spectroscopy, in particular for explosive trace gas detection where the specific gas may set a limit for the used laser power.