title: Strongly squeezed states at 532 nm based on frequency up-conversion.
abstract: Quantum metrology utilizes nonclassical states to improve the precision of measurement devices. In this context, strongly squeezed vacuum states of light have proven to be a useful resource. They are typically produced by spontaneous parametric down-conversion, but have not been generated at shorter wavelengths so far, as suitable nonlinear materials do not exist. Here, we report on the generation of strongly squeezed vacuum states at 532 nm with 5.5 dB noise suppression by means of frequency up-conversion from the telecommunication wavelength of 1550 nm. The up-converted states are employed in a model Mach-Zehnder interferometer to illustrate their use in quantum metrology.
authors.forename: Christoph
authors.initials: C
authors.lastname: Baune
authors.forename: Jan
authors.initials: J
authors.lastname: Gniesmer
authors.forename: Axel
authors.initials: A
authors.lastname: Schönbeck
authors.forename: Christina E
authors.initials: CE
authors.lastname: Vollmer
authors.forename: Jaromír
authors.initials: J
authors.lastname: Fiurášek
authors.forename: Roman
authors.initials: R
authors.lastname: Schnabel