{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2026:NKJLFZFV46O5NDKEWVERW7EMHZ","short_pith_number":"pith:NKJLFZFV","schema_version":"1.0","canonical_sha256":"6a92b2e4b5e79dd68d44b5491b7c8c3e4d94c34933bcc5944be9357ed68ff940","source":{"kind":"arxiv","id":"2607.08967","version":1},"attestation_state":"computed","paper":{"title":"Probing two-spin entanglement at quantum criticality on a quantum processor","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Anshumitra Baul, Phillip C. Lotshaw, Xiao Xiao","submitted_at":"2026-07-09T22:04:26Z","abstract_excerpt":"Quantum phase transitions in many-body systems give rise to highly entangled states, and understanding their quantum correlations is crucial for characterizing quantum materials. However, traditional entanglement measures such as entanglement entropy are difficult to interpret for noisy or mixed states and require complex circuits to evaluate. Therefore, we explore the Positive Partial Transpose (PPT) criterion, coupled with overlapping state tomography, as an efficient and scalable spin-spin entanglement witness. It detects pairwise entanglement from reduced density matrices, distinguishes qu"},"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":"2607.08967","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2026-07-09T22:04:26Z","cross_cats_sorted":[],"title_canon_sha256":"5ae7734c5f21d506ba16870737786f6cec879c34911ed611c68d94876e488655","abstract_canon_sha256":"67f7fee2485e86f4d8c8a6267fdc19957f2f58ea05550ec0cd061f8b1a20e36b"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-13T00:17:30.721950Z","signature_b64":"MTjtRbbfo/2Y1cF7kA/2Npo+SfNuIv8TId79BEHJvLkNEzBfeAkmUTNNGj3LSZEY/u7WcpzJ/ZivRiaxl4AtBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"6a92b2e4b5e79dd68d44b5491b7c8c3e4d94c34933bcc5944be9357ed68ff940","last_reissued_at":"2026-07-13T00:17:30.720610Z","signature_status":"signed_v1","first_computed_at":"2026-07-13T00:17:30.720610Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Probing two-spin entanglement at quantum criticality on a quantum processor","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Anshumitra Baul, Phillip C. Lotshaw, Xiao Xiao","submitted_at":"2026-07-09T22:04:26Z","abstract_excerpt":"Quantum phase transitions in many-body systems give rise to highly entangled states, and understanding their quantum correlations is crucial for characterizing quantum materials. However, traditional entanglement measures such as entanglement entropy are difficult to interpret for noisy or mixed states and require complex circuits to evaluate. Therefore, we explore the Positive Partial Transpose (PPT) criterion, coupled with overlapping state tomography, as an efficient and scalable spin-spin entanglement witness. It detects pairwise entanglement from reduced density matrices, distinguishes qu"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2607.08967","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2607.08967/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"aliases":[{"alias_kind":"arxiv","alias_value":"2607.08967","created_at":"2026-07-13T00:17:30.721286+00:00"},{"alias_kind":"arxiv_version","alias_value":"2607.08967v1","created_at":"2026-07-13T00:17:30.721286+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2607.08967","created_at":"2026-07-13T00:17:30.721286+00:00"},{"alias_kind":"pith_short_12","alias_value":"NKJLFZFV46O5","created_at":"2026-07-13T00:17:30.721286+00:00"},{"alias_kind":"pith_short_16","alias_value":"NKJLFZFV46O5NDKE","created_at":"2026-07-13T00:17:30.721286+00:00"},{"alias_kind":"pith_short_8","alias_value":"NKJLFZFV","created_at":"2026-07-13T00:17:30.721286+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":1,"internal_anchor_count":1,"sample":[{"citing_arxiv_id":"2608.08346","citing_title":"Entanglement and non-local magic in a non-unitarily deformed non-Hermitian bipartite system","ref_index":25,"is_internal_anchor":true}]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/NKJLFZFV46O5NDKEWVERW7EMHZ","json":"https://pith.science/pith/NKJLFZFV46O5NDKEWVERW7EMHZ.json","graph_json":"https://pith.science/api/pith-number/NKJLFZFV46O5NDKEWVERW7EMHZ/graph.json","events_json":"https://pith.science/api/pith-number/NKJLFZFV46O5NDKEWVERW7EMHZ/events.json","paper":"https://pith.science/paper/NKJLFZFV"},"agent_actions":{"view_html":"https://pith.science/pith/NKJLFZFV46O5NDKEWVERW7EMHZ","download_json":"https://pith.science/pith/NKJLFZFV46O5NDKEWVERW7EMHZ.json","view_paper":"https://pith.science/paper/NKJLFZFV","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=2607.08967&json=true","fetch_graph":"https://pith.science/api/pith-number/NKJLFZFV46O5NDKEWVERW7EMHZ/graph.json","fetch_events":"https://pith.science/api/pith-number/NKJLFZFV46O5NDKEWVERW7EMHZ/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/NKJLFZFV46O5NDKEWVERW7EMHZ/action/timestamp_anchor","attest_storage":"https://pith.science/pith/NKJLFZFV46O5NDKEWVERW7EMHZ/action/storage_attestation","attest_author":"https://pith.science/pith/NKJLFZFV46O5NDKEWVERW7EMHZ/action/author_attestation","sign_citation":"https://pith.science/pith/NKJLFZFV46O5NDKEWVERW7EMHZ/action/citation_signature","submit_replication":"https://pith.science/pith/NKJLFZFV46O5NDKEWVERW7EMHZ/action/replication_record"}},"created_at":"2026-07-13T00:17:30.721286+00:00","updated_at":"2026-07-13T00:17:30.721286+00:00"}