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High-sensitivity Quantum Sensing with Pump-enhanced Spontaneous Parametric Down-conversion by Lindner, Chiara; Kunz, Jachin; Herr, Simon J.; Kiessling, Jens; Wolf, Sebastian; Kühnemann, Frank is a scholarly article available to read on EtoBox.

What is High-sensitivity Quantum Sensing with Pump-enhanced Spontaneous Parametric Down-conversion about?

Recent years have seen the development of quantum sensing concepts utilizing nonlinear interferometers based on correlated photon pairs generated by spontaneous parametric down-conversion (SPDC). Using SPDC far from frequency degeneracy allows a 'division of labor' between the mid-infrared photon for strongest sample interaction and the correlated near-infrared photon for low-noise detection. The small number of photons provided by SPDC and the resulting inferior signal-to-noise ratio are, however, a limiting factor preventing wide applicability of the novel sensing concept. Here, we demonstrate a nonlinear interferometer based on pump-enhanced SPDC with strongly improved emission rates, but maintaining broadband, spontaneous emission. For validation of the concept, we demonstrate high-resolution mid-infrared spectroscopy with near-infrared detection, showcasing the improved accuracy. Although the number of mid-infrared photons is about five orders of magnitude smaller than in classical spectrometers, the sensitivity of the quantum spectrometer becomes comparable, marking an essential step toward real-world applications.

Author

Lindner, Chiara; Kunz, Jachin; Herr, Simon J.; Kiessling, Jens; Wolf, Sebastian; Kühnemann, Frank

Published

2022

Language

EN