Dresden 2011 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 59: Quantum Effects: Interference and Correlations
Q 59.3: Talk
Friday, March 18, 2011, 11:00–11:15, SCH A01
Probing multimode squeezing with correlation functions. — •Andreas Christ1, 2, Kaisa Laiho2, Andreas Eckstein2, Katiúscia N. Cassemiro2, and Christine Silberhorn1, 2 — 1Applied Physics, University of Paderborn, Warburger Straße 100, 33098 Paderborn, Germany — 2Max Planck Institute for the Science of Light,
Günther-Scharowsky Straße 1/Building 24, 91058 Erlangen, Germany
Broadband multimode squeezers constitute a powerful quantum resource with promising potential for different applications in quantum information technologies such as information coding in quantum communication networks or quantum simulations in higher dimensional systems. However, the characterization of a large array of squeezers that coexist in a single spatial mode is challenging. In this talk we tackle this problem and present a straightforward method to determine the number of squeezers and their respective squeezing strengths by using simple, broadband multimode correlation function measurements. These measurements employ the large detection windows of state of the art avalanche photodiodes to simultaneously probe the full Hilbert space of the generated state, which enables us to benchmark the squeezed states. Moreover, the measurements are loss-independent due to the structure of the normalized correlation function measurements. This is a significant advantage, since detectors with low efficiencies are sufficient. Our approach is less costly than full state tomography methods relying on multimode homodyne detection which builds on much more demanding measurement and analysis tools and appear to be impractical for larger Hilbert spaces.