期刊
PHYSICAL REVIEW A
卷 87, 期 2, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.87.022104
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资金
- Centre for Quantum Engineering and Space-Time Research (QUEST)
- International Max Planck Research School on Gravitational Wave Astronomy (IMPRS)
- DFG Sonderforschungsbereich [TR7]
- EU FP-7 project Q-ESSENCE
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
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