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Quantum correlations with no causal order
Ognyan Oreshkov, Fabio Costa, Caslav Brukner
The idea that events obey a definite causal order is deeply rooted in our understanding of the world and at the basis of the very notion of time. But where does causal order come f…
Optimal signal states for quantum detectors
Ognyan Oreshkov, John Calsamiglia, Ramon Munoz-Tapia +1
Quantum detectors provide information about quantum systems by establishing correlations between certain properties of those systems and a set of macroscopically distinct states of…
Approximate simulation of quantum channels
Cédric Bény, Ognyan Oreshkov
In Ref. [1], we proved a duality between two optimizations problems. The primary one is, given two quantum channels M and N, to find a quantum channel R such that RN is optimally c…