Comment on "How to observe and quantify quantum-discord states via correlations"
arXiv:2007.12345 · doi:10.1103/PhysRevA.102.016401
Abstract
The protocol proposed in the commented-upon article can certify zero discord; however, it fails to quantify non-zero discord for some states. Further, the protocol is less efficient than calculating discord via performing full quantum state tomography.
3 pages, 1 figure; comment on arXiv:1901.11514