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  4. High-sensitivity quantum sensing with pump-enhanced spontaneous parametric down-conversion
 
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2023
Journal Article
Title

High-sensitivity quantum sensing with pump-enhanced spontaneous parametric down-conversion

Abstract
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 the 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 the wide applicability of the novel sensing concept. Here, we demonstrate a nonlinear interferometer based on pump-enhanced SPDC with strongly improved emission rates while maintaining broadband spontaneous emission. For validation of the concept, we demonstrate high-resolution mid-infrared spectroscopy with near-infrared detection, showcasing 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(s)
Lindner, Chiara  
Fraunhofer-Institut für Physikalische Messtechnik IPM  
Kunz, Jachin  
Fraunhofer-Institut für Physikalische Messtechnik IPM  
Herr, Simon  
Fraunhofer-Institut für Physikalische Messtechnik IPM  
Kießling, Jens  
Fraunhofer-Institut für Physikalische Messtechnik IPM  
Wolf, Sebastian  
Fraunhofer-Institut für Physikalische Messtechnik IPM  
Kühnemann, Frank  
Fraunhofer-Institut für Physikalische Messtechnik IPM  
Journal
APL photonics  
Open Access
DOI
10.1063/5.0146025
Language
English
Fraunhofer-Institut für Physikalische Messtechnik IPM  
Keyword(s)
  • Quantum sensing

  • Spontaneous parametric down-conversion

  • Nonlinear interferometers

  • Infrared spectroscopy

  • Quantum spectrometer

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