2011/01/31 by Jianwei Xu · 19 citations
Computer Science · Mathematics · Physics and Astronomy · #Bipartite graph #Combinatorics #Computer science #Expression (computer science) #Graph #Mathematics #Measure (data warehouse) #Physics #Projective test #Pure mathematics #Quantum #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum discord #Quantum entanglement #Quantum mechanics #quant-ph
paper · pdf · doi:10.1016/j.physleta.2011.10.072
published in Physics Letters A 376(4), 320-324 (Elsevier BV)
arxiv created 2011/06/01 · openalex publication_date 2011/12/01 · arxiv updated 2015/05/27 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/06
The original definition of quantum discord of bipartite states was defined over one-sided projective measurements, it describes quantum correlation more extensively than entanglement. Dakic, Vedral, and Brukner [Phys. Rev. Lett. 105 (2010) 190502] introduced a geometric measure for this quantum discord, and Luo, Fu [Phys. Rev. A 82 (2010) 034302] simplified the variation expression of it. In this paper we introduce a geometric measure for the quantum discord over two-sided projective measurements. A simplified expression and a lower bound of this geometric measure are derived and explicit expressions are obtained for some special cases.