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The classical-quantum boundary for correlations: discord and related measures
Kavan Modi, Aharon Brodutch, Hugo Cable +2
One of the best signatures of nonclassicality in a quantum system is the existence of correlations that have no classical counterpart. Different methods for quantifying the quantum…
Classical to quantum in large number limit
Kavan Modi, Rosario Fazio, Saverio Pascazio +2
We construct a quantumness witness following the work of Alicki and van Ryn (AvR) in "A simple test of quantumness for a single system" [J. Phys. A: Math. Theor., vol. 41, 062001 (…
Criteria for measures of quantum correlations
Aharon Brodutch, Kavan Modi
Entanglement does not describe all quantum correlations and several authors have shown the need to go beyond entanglement when dealing with mixed states. Various different measures…
Quantum locking of classical correlations and quantum discord of classical-quantum states
S. Boixo, L. Aolita, D. Cavalcanti +2
A locking protocol between two parties is as follows: Alice gives an encrypted classical message to Bob which she does not want Bob to be able to read until she gives him the key.…
Unification of quantum and classical correlations and quantumness measures
Kavan Modi, Vlatko Vedral
We give a pedagogical introduction to quantum discord. We the discuss the problem of separation of total correlations in a given quantum state into entanglement, dissonance, and cl…