We introduce the concept of spatio-temporal steering (STS), which reduces, in special cases, to Einstein-Podolsky-Rosen steering and the recently-introduced temporal steering. We describe two measures of this effect referred to as the STS weight and robustness. We suggest that these STS measures enable a new way to assess nonclassical correlations in an open quantum network, such as quantum transport through nano-structures or excitation transfer in a complex biological system. As one of our examples, we apply STS to check nonclassical correlations among sites in a photosynthetic pigment-protein complex in the Fenna-Matthews-Olson model.
@article{arxiv.1608.03150,
title = {Spatio-Temporal Steering for Testing Nonclassical Correlations in Quantum Networks},
author = {Shin-Liang Chen and Neill Lambert and Che-Ming Li and Guang-Yin Chen and Yueh-Nan Chen and Adam Miranowicz and Franco Nori},
journal= {arXiv preprint arXiv:1608.03150},
year = {2017}
}