2011/12/21 by Paolo Perinotti
Computer Science · Mathematics · Physics and Astronomy · #Computer science #Data mining #Mathematics #Null (SQL) #Open quantum system #Physics #Probabilistic logic #Quantum #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum discord #Quantum mechanics #Signature (topology) #Statistical physics #Statistics #quant-ph
paper · pdf · doi:10.1103/physrevlett.108.120502
published as Phys. Rev. Lett. 108, 120502 (2012) · 5 pages, revtex style
arxiv created 2011/12/21 · openalex publication_date 2012/03/19 · arxiv updated 2012/09/13 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Quantum discord quantifies nonclassical correlations in quantum states. We introduce discord for states in causal probabilistic theories, inspired by the original definition proposed by H. Ollivier and W. H. Zurek [Phys. Rev. Lett. 88, 017901 (2001)]. We show that the only probabilistic theory in which all states have null discord is classical probability theory. Non-null discord is then not just a quantum feature, but a generic signature of nonclassicality.