Spatio-Temporal Steering for Testing Nonclassical Correlations in   Quantum Networks
  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. 
Shin-Liang Chen, Neill Lambert, Che-Ming Li, Guang-Yin Chen, Yueh-Nan   Chen, Adam Miranowicz, Franco Nori
quant-ph