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Generation of spontaneous parametric down-converted photons in the sub-terahertz frequency range at 660 nm

 
: Haase, B.; Kutas, M.; Reixinger, F.; Bickert, P.; Keil, A.; Bortz, M.; Molter, D.; Freymann, G. von

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Institute of Electrical and Electronics Engineers -IEEE-:
44th International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz 2019 : 1-6 September 2019, Paris, France
Piscataway, NJ: IEEE, 2019
ISBN: 978-1-5386-8285-2
ISBN: 978-1-5386-8286-9
pp.518-519
International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz) <44, 2019, Paris>
English
Conference Paper
Fraunhofer ITWM ()
spontaneous parametric down-converted photons; frequency angular spectrum; VIS pump photons; external terahertz radiation; difference frequency generation; backward terahertz radiation; entangled photon source; sub-terahertz frequency range; terahertz quantum sensing

Abstract
There are two crucial steps towards terahertz quantum sensing. First, there is the challenge to deliver a source of entangled photons in the terahertz range. Second, measuring terahertz radiation using photons in a different spectral range has to be possible. As we generated entangled photons in the terahertz range by spontaneous parametric down conversion (SPDC), we reached the first milestone. The detected signals match both for down- and for up-conversion for forward as well as for backward terahertz radiation the calculated frequency angular spectrum both qualitatively and quantitatively [1]. By observing difference frequency generation of external terahertz radiation with VIS pump photons, we achieved both steps towards terahertz quantum sensing.

: http://publica.fraunhofer.de/documents/N-574392.html