Terahertz quantum sensing

Quantum sensing is highly attractive for accessing spectral regions in which the detection of photons is technically challenging: Sample information is gained in the spectral region of interest and transferred via biphoton correlations into another spectral range, for which highly sensitive detector...

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Bibliographic Details
Published in:Science advances 2020-03, Vol.6 (11), p.eaaz8065-eaaz8065
Main Authors: Kutas, Mirco, Haase, Björn, Bickert, Patricia, Riexinger, Felix, Molter, Daniel, von Freymann, Georg
Format: Article
Language:English
Subjects:
Optics
Physics
SciAdv r-articles
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Summary:Quantum sensing is highly attractive for accessing spectral regions in which the detection of photons is technically challenging: Sample information is gained in the spectral region of interest and transferred via biphoton correlations into another spectral range, for which highly sensitive detectors are available. This is especially beneficial for terahertz radiation, where no semiconductor detectors are available and coherent detection schemes or cryogenically cooled bolometers have to be used. Here, we report on the first demonstration of quantum sensing in the terahertz frequency range in which the terahertz photons interact with a sample in free space and information about the sample thickness is obtained by the detection of visible photons. As a first demonstration, we show layer thickness measurements with terahertz photons based on biphoton interference. As nondestructive layer thickness measurements are of high industrial relevance, our experiments might be seen as a first step toward industrial quantum sensing applications.
ISSN:2375-2548
2375-2548
DOI:10.1126/sciadv.aaz8065