Berlin 2014 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 30: Poster: Photonics, laser development and applications, ultrashort laser pulses, quantum effects
Q 30.6: Poster
Tuesday, March 18, 2014, 16:30–18:30, Spree-Palais
Verifying Non-Gaussianity of up-converted single photons — •Christoph Baune1, Axel Schönbeck1, Aiko Samblowski1, Jaromír Fiurášek2, and Roman Schnabel1 — 1Albert-Einstein-Institut, Institut für Gravitationsphysik, Leibniz Universität Hannover, Callinstraße 38, D-30167 Hannover — 2Department of Optics, Palacký University, 17. listupadu 12, 77146 Olomouc, Czech Republic
Non-classical states are crucial in many quantum metrology and quantum information processing tasks. Commonly, complete state information is required to proof that it cannot be described by convex mixtures of Gaussian states - a statement that the state is non-classical. We exploit a criterion proposed by Filip and Mišta [1] to up-converted single photons. Correlated photon pairs are produced at 810 nm and 1550 nm by means of non-degenerate down-conversion. The latter are up-converted to 532 nm and analyzed in a Hanbury Brown and Twiss setup. The quantum non-Gaussianity could be confirmed by the single photon and vacuum contribution of the state while higher photon number states could be neglected to a very good approximation. Our experiments show that quantum non-Gaussianity is maintained by means of frequency up-conversion.
[1] Filip, R. & Mišta, L. Detecting Quantum States with a Positive Wigner Function beyond Mixtures of Gaussian States. Phys. Rev. Lett. 106, 200401 (2011).