Heidelberg 2015 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 24: Quantum Effects: Entanglement and Decoherence III
Q 24.1: Talk
Tuesday, March 24, 2015, 14:30–14:45, B/gHS
Loss-tolerant hybrid measurement test of Bell's inequality with weakly amplified N00N states — •Falk Töppel1,2 and Magdalena Stobińska3,4 — 1Max Planck Institute for the Science of Light, Günther-Scharowsky-Straße 1/Bldg. 24, 91058 Erlangen, Germany — 2Institute for Optics, Information and Photonics, Universität Erlangen-Nürnberg, Staudtstraße 7/B2, 91058 Erlangen, Germany — 3Institute of Theoretical Physics and Astrophysics, University of Gdańsk, ul. Wita Stwosza 57, 80-952 Gdańsk, Poland — 4Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warsaw, Poland
Despite recent experimental and theoretical advances, thus far all Bell tests have suffered from loopholes. Most optical Bell tests rely on inefficient discrete-outcome measurements, often provided by photon counting detection. One possible way to close the detection loophole in optical Bell tests is to involve efficient continuous-variable measurements instead, such as homodyne detection. Here, we study a hybrid test of the Clauser-Horne-Shimony-Holt (CHSH) inequality that combines photon counting and homodyne detection applied to amplified two-photon N00N states. The scheme proposed is remarkably robust against experimental imperfections and suits the limits of current technology. It may therefore constitute an alternative platform for a loophole-free Bell test or other important quantum-technological applications. Furthermore, as experimentally accessible macroscopic quantum states of light are considered, our work also contributes to the exploration of entangled macroscopic quantum systems.