Hannover 2010 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 66: Quantum Information: Photons and Nonclassical Light III
Q 66.5: Talk
Friday, March 12, 2010, 15:00–15:15, E 214
Accessing higher order correlations by time-multiplexing — •Malte Avenhaus1, Kaisa Laiho1, Maria V. Chekhova1,2, and Christine Silberhorn1 — 1Max Planck Institute for the Science of Light, Günther-Scharowsky-Straße 1/Bau 24, 91058 Erlangen — 2Department of Physics, M. V. Lomonosov Moscow State University, Leninskie Gory, 119992 Moscow, Russia
The characterization of optical quantum states poses an important prerequisite for many applications like the security of quantum key distribution or the analysis of quantum sources. Here, we focus on normalized correlation functions which yield information about a state without any assumption about optical losses, rendering an intriguing approach for Fock state measurements with lossy detectors.
We experimentally measured higher order normalized correlation functions of pulsed light with a time-multiplexing-detector. We demonstrate excellent performance of our device by verifying a unity valued up to the eighth order for coherent light, and factorial dependence for pseudo-thermal light. Further, we applied our measurement technique to a type-II parametric downconversion source to investigate mutual two-mode correlation properties and ascertain non-classicality.