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  Strong Einstein-Podolsky-Rosen steering with unconditional entangled states

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.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-000E-EB83-0 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-000E-EB84-E
Genre: Journal Article

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Steinlechner, Sebastian1, Author              
Bauchrowitz, Jöran1, Author              
Eberle, Tobias1, Author              
Schnabel, Roman1, Author              
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1Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, ou_24010              

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 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.

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 Dates: 2013
 Publication Status: Published in print
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 Identifiers: DOI: 10.1103/PhysRevA.87.022104
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Title: Physical Review A
  Other : Phys. Rev. A
Source Genre: Journal
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Publ. Info: New York, NY : Published by the American Physical Society through the American Institute of Physics
Pages: - Volume / Issue: 87 Sequence Number: 022104 Start / End Page: - Identifier: ISSN: 1050-2947
CoNE: /journals/resource/954925225012_2