title: Quantum non-Gaussianity of frequency up-converted single photons.
abstract: Nonclassical states of light are an important resource in today's quantum communication and metrology protocols. Quantum up-conversion of nonclassical states is a promising approach to overcome frequency differences between disparate subsystems within a quantum information network. Here, we present the generation of heralded narrowband single photons at 1550 nm via cavity enhanced spontaneous parametric down-conversion (SPDC) and their subsequent up-conversion to 532 nm. Quantum non-Gaussianity (QNG), which is an important feature for applications in quantum information science, was experimentally certified for the first time in frequency up-converted states.
authors.forename: Christoph
authors.initials: C
authors.lastname: Baune
authors.forename: Axel
authors.initials: A
authors.lastname: Schönbeck
authors.forename: Aiko
authors.initials: A
authors.lastname: Samblowski
authors.forename: Jaromír
authors.initials: J
authors.lastname: Fiurášek
authors.forename: Roman
authors.initials: R
authors.lastname: Schnabel
mesh_terms: D004867:Equipment Design; D008027:Light; D017785:Photons; D011789:Quantum Theory; D012031:Refractometry / Q000295:instrumentation*