Strong continuous variable EPR-steering with a detection efficiency above 96%

Details Strong continuous variable EPR-steering with a detection efficiency above 96% Strong continuous variable EPR-steering with a detection efficiency above 96%

2011-12-02

arxiv.org/abs/1112.0461v1

Physics

Quantum Physics

5 pages, 4 figures

Scientific paper

In 1935, Einstein, Podolsky, and Rosen reported a gedanken experiment which became famous as the EPR-paradox. In the same year, Schr\"odinger 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.

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