2010/08/26 by Vaibhav Madhok, Animesh Datta · 1 citation
Computer Science · Mathematics · Physics and Astronomy · #Discrete mathematics #Mathematics #Open quantum system #Physics #Quantum #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum channel #Quantum discord #Quantum entanglement #Quantum information #Quantum mechanics #Quantum operation #Quantum relative entropy #Quantum state #Statistical physics #Subadditivity #Theoretical physics #Von Neumann entropy #cs.IT #math.IT #quant-ph
paper · pdf · doi:10.1103/physreva.83.032323
published as Phys. Rev. A, 83, 032323 (2011) · 5 pages, no figures. See http://arxiv.org/abs/1008.3205 for similar results. Typos fixed, references and acknowledgements updated. End note added
arxiv created 2010/08/26 · openalex publication_date 2011/03/31 · arxiv updated 2011/06/21 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We present an operational interpretation of quantum discord based on the quantum state merging protocol. Quantum discord is the markup in the cost of quantum communication in the process of quantum state merging, if one discards relevant prior information. Our interpretation has an intuitive explanation based on the strong subadditivity of von Neumann entropy. We use our result to provide operational interpretations of other quantities like the local purity and quantum deficit. Finally, we discuss in brief some instances where our interpretation is valid in the single-copy scenario.