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Journal Article

Strong Einstein-Podolsky-Rosen steering with unconditional entangled states

MPS-Authors
http://pubman.mpdl.mpg.de/cone/persons/resource/persons1464

Steinlechner,  Sebastian
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons40427

Bauchrowitz,  Jöran
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons40444

Eberle,  Tobias
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons40490

Schnabel,  Roman
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

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PRA87_022104.pdf
(Any fulltext), 367KB

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Citation

Steinlechner, S., Bauchrowitz, J., Eberle, T., & Schnabel, R. (2013). Strong Einstein-Podolsky-Rosen steering with unconditional entangled states. Physical Review A, 87: 022104. doi:10.1103/PhysRevA.87.022104.


Cite as: http://hdl.handle.net/11858/00-001M-0000-000E-EB83-0
Abstract
In 1935 Schrödinger introduced the terms entanglement and steering in the context of the famous gedanken experiment discussed by Einstein, Podolsky, and Rosen (EPR). Here, we report on a sixfold increase of the observed EPR-steering effect with regard to previous experiments, as quantified by the Reid criterion. We achieved an unprecedented low conditional variance product of about 0.04<1, where 1 is the upper bound below which steering is demonstrated. The steering effect was observed on an unconditional two-mode-squeezed entangled state that contained a total vacuum state contribution of less than 8%, including detection imperfections. Together with the achieved high interference contrast between the entangled state and a bright coherent laser field, our state is compatible with efficient applications in high-power laser interferometers and fiber-based networks for entanglement distribution.