Stuttgart 2012 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 60: Materiewellen und Technologie

Q 60.6: Talk

Friday, March 16, 2012, 11:45–12:00, V53.01

Strong continuous-variable EPR-steering with a detection efficiency above 96% — •Sebastian Steinlechner, Jöran Bauchrowitz, Melanie Meinders, Tobias Eberle, Vitus Händchen, and Roman Schnabel — Institut für Gravitationsphysik, Leibniz Universität Hannover and Max-Planck-Institut für Gravitationsphysik (Albert-Einstein-Institut), Callinstr. 38, 30167 Hannover

In 1935, Einstein, Podolsky, and Rosen reported a gedanken experiment which became famous as the EPR-paradox. In the same year, Schrödinger introduced the terms entanglement and steering in order to describe the underlying effect that a measurement on subsystem A of a certain class of entangled states may apparently allow for a remote steering of the measurement outcome at subsystem B, without the presence of a physical interaction between the subsystems. In this work we report on the observation of unprecedented strong EPR-steering in the gaussian regime, quantified by an EPR co-variance product of about 0.04<1, where 1 is the critical value. Together with a high detection efficiency of more than 96%, our result is an important milestone towards applications of gaussian entanglement distribution.