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Based on their calculation, they claim \"It is found that there exists a nondynamic sudden change in quantum discord\" for these states. In this Comment, we criticize their work by pointing out that what has been calculated is actually a bound, and not the exact value of discord. Since, generally, it is not possible to infer the exact value (or property) of a quantity just from its bound, we can not conclude"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1309.6890","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2013-09-26T13:37:00Z","cross_cats_sorted":[],"title_canon_sha256":"86f68f7ff988ec75039e59d1fdcc94f45e968cab3b7f39d9f58597b9f2e9557c","abstract_canon_sha256":"fc23774b19d0f9ba308ec065a1ce6343fc62ce4038a0b46c4b515d7ec1e53110"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:12:09.844337Z","signature_b64":"PyWYyN06KYkbPRFN//JLwaY2zFYGrbmtef1vbHSz6MM/xREl/gpUSOI11g9AoB75GD6LHxY5NpDSq6Bup9LlDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"d335dbe0abb64e0442ca99cbcbc0c5e6cc1a71939a60ae77ae2e5970136b1f5f","last_reissued_at":"2026-05-18T03:12:09.843724Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:12:09.843724Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Comment on \"Sudden change in quantum discord accompanying the transition from bound to free entanglement\"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Preeti Parashar, Swapan Rana","submitted_at":"2013-09-26T13:37:00Z","abstract_excerpt":"In a recent article [http://dx.doi.org/10.1103/PhysRevA.87.022340, Phys. 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