{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2015:KA3EABCYTNR4NLHQWUID4M3GQB","short_pith_number":"pith:KA3EABCY","schema_version":"1.0","canonical_sha256":"50364004589b63c6acf0b5103e33668066b4085edf87e4c8a0e5bf3fa80226db","source":{"kind":"arxiv","id":"1506.02333","version":3},"attestation_state":"computed","paper":{"title":"Mixedness and Entanglement in the presence of Localized Closed Timelike Curves","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["quant-ph"],"primary_cat":"hep-th","authors_text":"DaeKil Park, Eylee Jung","submitted_at":"2015-06-08T01:17:02Z","abstract_excerpt":"We examine mixedness and entanglement of the chronology-respecting (CR) system with assuming that quantum mechanical closed timelike curves (CTCs) exist in nature and by introducing the qubit system and applying the general controlled operations between CR and CTC systems. We use the magnitude of Bloch vector as a measure of mixedness. While Deutschian-CTC (D-CTC) either preserves or decreases the magnitude, postselected-CTC (P-CTC) can increases it. Nonintuitively, even the completely mixed CR-qubit can be converted into a pure state after CTC-qubit travels around the P-CTC. It is also shown "},"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":"1506.02333","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-th","submitted_at":"2015-06-08T01:17:02Z","cross_cats_sorted":["quant-ph"],"title_canon_sha256":"451d801202bff8054ee6a4323906abf25d0736451df25fa775f36e5e32f34d3a","abstract_canon_sha256":"c6828e601e06c1ce4932ce084b782c01e5c05fb2983a8bf396427b385545b927"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:11:38.719057Z","signature_b64":"KiUxL07L2Y9R20JZ9xZ9Xv10LOFFxnHqdLNtt+uj7ypBDPjjinuooF+zkj5KbiyMEc363IT8n+Hex1RvxbXgDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"50364004589b63c6acf0b5103e33668066b4085edf87e4c8a0e5bf3fa80226db","last_reissued_at":"2026-05-18T01:11:38.718701Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:11:38.718701Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Mixedness and Entanglement in the presence of Localized Closed Timelike Curves","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["quant-ph"],"primary_cat":"hep-th","authors_text":"DaeKil Park, Eylee Jung","submitted_at":"2015-06-08T01:17:02Z","abstract_excerpt":"We examine mixedness and entanglement of the chronology-respecting (CR) system with assuming that quantum mechanical closed timelike curves (CTCs) exist in nature and by introducing the qubit system and applying the general controlled operations between CR and CTC systems. We use the magnitude of Bloch vector as a measure of mixedness. While Deutschian-CTC (D-CTC) either preserves or decreases the magnitude, postselected-CTC (P-CTC) can increases it. Nonintuitively, even the completely mixed CR-qubit can be converted into a pure state after CTC-qubit travels around the P-CTC. It is also shown "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1506.02333","kind":"arxiv","version":3},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"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":"1506.02333","created_at":"2026-05-18T01:11:38.718760+00:00"},{"alias_kind":"arxiv_version","alias_value":"1506.02333v3","created_at":"2026-05-18T01:11:38.718760+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1506.02333","created_at":"2026-05-18T01:11:38.718760+00:00"},{"alias_kind":"pith_short_12","alias_value":"KA3EABCYTNR4","created_at":"2026-05-18T12:29:27.538025+00:00"},{"alias_kind":"pith_short_16","alias_value":"KA3EABCYTNR4NLHQ","created_at":"2026-05-18T12:29:27.538025+00:00"},{"alias_kind":"pith_short_8","alias_value":"KA3EABCY","created_at":"2026-05-18T12:29:27.538025+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/KA3EABCYTNR4NLHQWUID4M3GQB","json":"https://pith.science/pith/KA3EABCYTNR4NLHQWUID4M3GQB.json","graph_json":"https://pith.science/api/pith-number/KA3EABCYTNR4NLHQWUID4M3GQB/graph.json","events_json":"https://pith.science/api/pith-number/KA3EABCYTNR4NLHQWUID4M3GQB/events.json","paper":"https://pith.science/paper/KA3EABCY"},"agent_actions":{"view_html":"https://pith.science/pith/KA3EABCYTNR4NLHQWUID4M3GQB","download_json":"https://pith.science/pith/KA3EABCYTNR4NLHQWUID4M3GQB.json","view_paper":"https://pith.science/paper/KA3EABCY","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1506.02333&json=true","fetch_graph":"https://pith.science/api/pith-number/KA3EABCYTNR4NLHQWUID4M3GQB/graph.json","fetch_events":"https://pith.science/api/pith-number/KA3EABCYTNR4NLHQWUID4M3GQB/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/KA3EABCYTNR4NLHQWUID4M3GQB/action/timestamp_anchor","attest_storage":"https://pith.science/pith/KA3EABCYTNR4NLHQWUID4M3GQB/action/storage_attestation","attest_author":"https://pith.science/pith/KA3EABCYTNR4NLHQWUID4M3GQB/action/author_attestation","sign_citation":"https://pith.science/pith/KA3EABCYTNR4NLHQWUID4M3GQB/action/citation_signature","submit_replication":"https://pith.science/pith/KA3EABCYTNR4NLHQWUID4M3GQB/action/replication_record"}},"created_at":"2026-05-18T01:11:38.718760+00:00","updated_at":"2026-05-18T01:11:38.718760+00:00"}