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Terahertz quantum sensing
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DOI：10.1126/sciadv.aaz8065.png)
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摘要
En 中文
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.
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DEPENDENT REFRACTIVE-INDEX
INDUCED COHERENCE
ABSORPTION-COEFFICIENT
LITHIUM-NIOBATE
CONGRUENT
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IF:
12.5
论文数:
2.1W
被引数:
18.1W
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分享收藏分享收藏Spontaneous parametric down-conversion of photons at 660 nm to the terahertz and sub-terahertz frequency range.png)
OPTICS EXPRESS
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OPTICS EXPRESSIF3.3
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