Reply to "comment on 'How to observe and quantify quantum-discord states via correlations' "

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  • Aston University
  • Weizmann Institute of Science Israel


The authors of the preceding Comment [Kumar and Snizhko, Phys. Rev. A 102, 016401 (2020)10.1103/PhysRevA.102.016401] made two critical remarks regarding the protocol for detecting and quantifying quantumness of separable states presented in our paper [Hunt, Phys. Rev. A 100, 022321 (2019)2469-992610.1103/PhysRevA.100.022321]. One is that our protocol is not "experiment friendly"in comparison to full quantum state tomography. The other is that the suggested quantifier fails to distinguish different degrees of quantumness within the family of Werner states. We will show that, while being technically correct, both remarks referred to generalizations of our protocol which had been neither suggested nor intended. We will reiterate why the proposed protocol would be advantageous, compared to full or partial quantum state tomography, for detecting and quantifying discord in many-body bipartite states.


Original languageEnglish
Article number016402
JournalPhysical Review A
Issue number1
Publication statusPublished - Jul 2020