Strong Einstein-Podolsky-Rosen steering with unconditional entangled states

S. Steinlechner*, J. Bauchrowitz, T. Eberle, R. Schnabel

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

In 1935 Schrodinger 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. DOI: 10.1103/PhysRevA.87.022104

Original languageEnglish
Article number022104
Number of pages5
JournalPhysical Review A
Volume87
Issue number2
DOIs
Publication statusPublished - 6 Feb 2013
Externally publishedYes

Keywords

  • EXPERIMENTAL GENERATION
  • SQUEEZED-LIGHT
  • REALIZATION
  • PARADOX
  • VIOLATION

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