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Quantum correlations with no causal order
It is shown that in a classical limit causal order always arises, which suggests that space-time may emerge from a more fundamental structure in a quantum-to-classical transition.
Necessary and sufficient condition for nonzero quantum discord.
A necessary and sufficient condition for the existence of nonzero quantum discord for any dimensional bipartite states is obtained, and a geometrical way of quantifying quantum discord is proposed.
A new measure of information in quantum mechanics is proposed which takes into account that for quantum systems the only features known before an experiment is performed are the probabilities for
Information and Fundamental Elements of the Structure of Quantum Theory
According to Aage Petersen Niels Bohr liked to say: “There is no quantum world. There is only an abstract quantum physical description. It is wrong to think that the task of physics is to find out
Probing Planck-scale physics with quantum optics
One of the main challenges in physics today is to merge quantum theory and the theory of general relativity into a unified framework. Researches are developing various approaches towards such a
Universal decoherence due to gravitational time dilation
Gravity and quantum mechanics are expected to meet at extreme energy scales, but time dilation could induce decoherence even at low energies affecting microscopic objects—a prospect that could be
Quantum Theory and Beyond: Is Entanglement Special?
Quantum theory makes the most accurate empirical predictions and yet it lacks simple, comprehensible physical principles from which the theory can be uniquely derived. A broad class of probabilistic
A No-Go Theorem for Observer-Independent Facts
  • Č. Brukner
  • Computer Science, Medicine
  • 2 April 2018
A no-go theorem for observer-independent facts, which would be common both for Wigner and the friend is derived and is analyzed in the context of a newly-derived theorem arXiv:1604.07422, where Frauchiger and Renner prove that “single-world interpretations of quantum theory cannot be self-consistent”.
Conditions for quantum violation of macroscopic realism.
There exist "nonclassical" Hamiltonians whose time evolution cannot be understood classically, although at every instant of time the quantum state appears as a classical mixture, and it is suggested that such Hamiltonians are unlikely to be realized in nature because of their high computational complexity.
Condition for macroscopic realism beyond the Leggett-Garg inequalities
In 1985, Leggett and Garg put forward the concept of macroscopic realism (macrorealism) and, in analogy to Bell's theorem, derived a necessary condition in terms of inequalities, which are now known