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Quantum violation of macroscopic realism and the transition to classical physics
Johannes Kofler
The descriptions of the quantum realm and the macroscopic classical world differ significantly not only in their mathematical formulations but also in their foundational concepts a…
Logical independence and quantum randomness
Tomasz Paterek, Johannes Kofler, Robert Prevedel +4
We propose a link between logical independence and quantum physics. We demonstrate that quantum systems in the eigenstates of Pauli group operators are capable of encoding mathemat…
Violation of local realism with freedom of choice
Thomas Scheidl, Rupert Ursin, Johannes Kofler +8
Bell's theorem shows that local realistic theories place strong restrictions on observable correlations between different systems, giving rise to Bell's inequality which can be vio…
Comment on: Testing the speed of 'spooky action at a distance'
Johannes Kofler, Rupert Ursin, Caslav Brukner +1
In a recent experiment, Salart et al. addressed the important issues of the speed of hypothetical communication and of reference frames in Bell-type experiments. The authors report…
Positive phase space transformation incompatible with classical physics
Wonmin Son, Johannes Kofler, M. S. Kim +2
Bell conjectured that a positive Wigner function does not allow violation of the inequalities imposed by local hidden variable theories. A requirement for this conjecture is "when…
Space-QUEST: Experiments with quantum entanglement in space
Rupert Ursin, Thomas Jennewein, Johannes Kofler +36
The European Space Agency (ESA) has supported a range of studies in the field of quantum physics and quantum information science in space for several years, and consequently we hav…