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.
arXiv comment3 pages, 1 figure; comment on arXiv:1901.11514
References in corpus (8)
- Entanglement of Formation of an Arbitrary State of Two Qubits
- Separability Criterion for Density Matrices
- Separability of Mixed States: Necessary and Sufficient Conditions
- Introducing Quantum Discord
- Quantum discord for two-qubit X-states
- How to observe and quantify quantum-discorded states via correlations
- How to observe and quantify quantum-discorded states
- Another convex combination of product states for the separable Werner state