Comment on "How to observe and quantify quantum-discord states via correlations"
Parveen Kumar, Kyrylo Snizhko
TL;DR
This paper critiques a proposed method for certifying quantum discord, highlighting its inability to quantify non-zero discord in some states and its inefficiency compared to full quantum state tomography.
Contribution
It provides a critical analysis of an existing protocol, demonstrating its limitations in quantifying quantum discord and comparing its efficiency.
Findings
The protocol cannot quantify non-zero discord in some states.
Full quantum state tomography is more efficient for calculating discord.
The protocol is limited to certifying zero discord, not quantifying non-zero discord.
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.
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