Bipartite Postquantum Steering in Generalized Scenarios

Ana Belén Sainz, Matty J. Hoban, Paul Skrzypczyk, Leandro Aolita
2020 Physical Review Letters  
The study of stronger-than-quantum effects is a fruitful line of research that provides valuable insight into quantum theory. Unfortunately, traditional bipartite steering scenarios can always be explained by quantum theory. Here, we show that, by relaxing this traditional setup, bipartite steering incompatible with quantum theory is possible. The two scenarios we describe, which still feature Alice remotely steering Bob's system, are (i) one where Bob also has an input and operates on his
more » ... stem, and (ii) the "instrumental steering" scenario. We show that such bipartite postquantum steering is a genuinely new type of postquantum nonlocality, which does not follow from postquantum Bell nonlocality. In addition, we present a method to bound quantum violations of steering inequalities in these scenarios.
doi:10.1103/physrevlett.125.050404 pmid:32794874 fatcat:a2ph55gbnzd5dk2neu7bwmd7p4