The advent of structured, high-dimensional entangled states brings new possibilities for quantum imaging, information processing and quantum key distribution. We experimentally generate and characterize a spatially entangled state stored in a quantum memory system, using entropic EPR-steering inequality, yielding genuine violation of 1.06±0.15 bits and certifying entanglement of formation of at least 0.70±0.15 ebits. The supremacy of the entropic witness is demonstrated for a wide class of experimentally available states, giving prospects for EPR-steering applications in noisy systems or with lossy quantum channels.
@article{arxiv.1711.08948,
title = {Certification of high-dimensional entanglement and Einstein-Podolsky-Rosen steering with cold atomic quantum memory},
author = {Michał Dąbrowski and Mateusz Mazelanik and Michał Parniak and Adam Leszczyński and Michał Lipka and Wojciech Wasilewski},
journal= {arXiv preprint arXiv:1711.08948},
year = {2019}
}