{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2009:HFOTMBKKMJHQ5EMYQ3MZ77NGHE","short_pith_number":"pith:HFOTMBKK","canonical_record":{"source":{"id":"0905.4652","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2009-05-28T13:49:04Z","cross_cats_sorted":[],"title_canon_sha256":"06ff8743251ce8fa7de84f02964a02fe491d1918094daa505c1eae80c721b0fd","abstract_canon_sha256":"600c4a040c308e6cf10a09238f42a5e668c2e8cef2cf52c6cb0d58677b3bcd1a"},"schema_version":"1.0"},"canonical_sha256":"395d36054a624f0e919886d99ffda63908295342f02edfe4f23003f2fff10b3e","source":{"kind":"arxiv","id":"0905.4652","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0905.4652","created_at":"2026-05-18T04:12:55Z"},{"alias_kind":"arxiv_version","alias_value":"0905.4652v2","created_at":"2026-05-18T04:12:55Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0905.4652","created_at":"2026-05-18T04:12:55Z"},{"alias_kind":"pith_short_12","alias_value":"HFOTMBKKMJHQ","created_at":"2026-05-18T12:25:59Z"},{"alias_kind":"pith_short_16","alias_value":"HFOTMBKKMJHQ5EMY","created_at":"2026-05-18T12:25:59Z"},{"alias_kind":"pith_short_8","alias_value":"HFOTMBKK","created_at":"2026-05-18T12:25:59Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2009:HFOTMBKKMJHQ5EMYQ3MZ77NGHE","target":"record","payload":{"canonical_record":{"source":{"id":"0905.4652","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2009-05-28T13:49:04Z","cross_cats_sorted":[],"title_canon_sha256":"06ff8743251ce8fa7de84f02964a02fe491d1918094daa505c1eae80c721b0fd","abstract_canon_sha256":"600c4a040c308e6cf10a09238f42a5e668c2e8cef2cf52c6cb0d58677b3bcd1a"},"schema_version":"1.0"},"canonical_sha256":"395d36054a624f0e919886d99ffda63908295342f02edfe4f23003f2fff10b3e","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:12:55.794698Z","signature_b64":"g1ocNUPrLU/YJaPXdEc7byIYTomgejGGoz6g5tCwGW/MiRzdlb1cId7OV3+JS1oBFZJlWqrnAKIA0ktG5TR2AQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"395d36054a624f0e919886d99ffda63908295342f02edfe4f23003f2fff10b3e","last_reissued_at":"2026-05-18T04:12:55.794104Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:12:55.794104Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0905.4652","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T04:12:55Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"U0w81SU4pbNFSOpiBwl/xRg8crFk1SwQWyhPDoHgUyJqFOTJZPrY6svcBQkTA1jdbyxvZy8FAF1uHG3M93FkCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T04:17:31.493799Z"},"content_sha256":"27555911c786b47d5582fec087435c4f26d9c6354397d553df0760b07370259d","schema_version":"1.0","event_id":"sha256:27555911c786b47d5582fec087435c4f26d9c6354397d553df0760b07370259d"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2009:HFOTMBKKMJHQ5EMYQ3MZ77NGHE","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Sudden Death and Birth of Entanglement Effects for Kerr-Nonlinear Coupler","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"A. Kowalewska-Kud{\\l}aszyk, W. Leo\\'nski","submitted_at":"2009-05-28T13:49:04Z","abstract_excerpt":"We analyse the entanglement dynamics in a nonlinear Kerr-like coupler interacting with external environment. Whenever the reservoir is in a thermal vacuum state the entanglement (measured by concurrence for a two-qubit system) exhibits regular oscillations of decreasing amplitude. In contrast, for thermal reservoirs we can observe dark periods in concurrence oscillations (which can be called a \"sudden death\" of the entanglement) and the entanglement rebuild (which can be named the \"sudden birth\" of entanglement). We show that these features can be observed when we deal with 2-qubit system as w"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0905.4652","kind":"arxiv","version":2},"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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T04:12:55Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"yP6py+/Swg/fmPq6lAf1OLNVDS64VKBFXNWWiU3+SMckJ2tZ/eFCr9VYojLyK7LdpMGJV/o7/CLpd6bKnQ/mBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T04:17:31.494139Z"},"content_sha256":"08ee0c8a79ca391d5806a446ff54c26af6802b33d3508fecc7da0b603c986d14","schema_version":"1.0","event_id":"sha256:08ee0c8a79ca391d5806a446ff54c26af6802b33d3508fecc7da0b603c986d14"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/HFOTMBKKMJHQ5EMYQ3MZ77NGHE/bundle.json","state_url":"https://pith.science/pith/HFOTMBKKMJHQ5EMYQ3MZ77NGHE/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/HFOTMBKKMJHQ5EMYQ3MZ77NGHE/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-06-02T04:17:31Z","links":{"resolver":"https://pith.science/pith/HFOTMBKKMJHQ5EMYQ3MZ77NGHE","bundle":"https://pith.science/pith/HFOTMBKKMJHQ5EMYQ3MZ77NGHE/bundle.json","state":"https://pith.science/pith/HFOTMBKKMJHQ5EMYQ3MZ77NGHE/state.json","well_known_bundle":"https://pith.science/.well-known/pith/HFOTMBKKMJHQ5EMYQ3MZ77NGHE/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:HFOTMBKKMJHQ5EMYQ3MZ77NGHE","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"600c4a040c308e6cf10a09238f42a5e668c2e8cef2cf52c6cb0d58677b3bcd1a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2009-05-28T13:49:04Z","title_canon_sha256":"06ff8743251ce8fa7de84f02964a02fe491d1918094daa505c1eae80c721b0fd"},"schema_version":"1.0","source":{"id":"0905.4652","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0905.4652","created_at":"2026-05-18T04:12:55Z"},{"alias_kind":"arxiv_version","alias_value":"0905.4652v2","created_at":"2026-05-18T04:12:55Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0905.4652","created_at":"2026-05-18T04:12:55Z"},{"alias_kind":"pith_short_12","alias_value":"HFOTMBKKMJHQ","created_at":"2026-05-18T12:25:59Z"},{"alias_kind":"pith_short_16","alias_value":"HFOTMBKKMJHQ5EMY","created_at":"2026-05-18T12:25:59Z"},{"alias_kind":"pith_short_8","alias_value":"HFOTMBKK","created_at":"2026-05-18T12:25:59Z"}],"graph_snapshots":[{"event_id":"sha256:08ee0c8a79ca391d5806a446ff54c26af6802b33d3508fecc7da0b603c986d14","target":"graph","created_at":"2026-05-18T04:12:55Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"We analyse the entanglement dynamics in a nonlinear Kerr-like coupler interacting with external environment. Whenever the reservoir is in a thermal vacuum state the entanglement (measured by concurrence for a two-qubit system) exhibits regular oscillations of decreasing amplitude. In contrast, for thermal reservoirs we can observe dark periods in concurrence oscillations (which can be called a \"sudden death\" of the entanglement) and the entanglement rebuild (which can be named the \"sudden birth\" of entanglement). We show that these features can be observed when we deal with 2-qubit system as w","authors_text":"A. Kowalewska-Kud{\\l}aszyk, W. Leo\\'nski","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2009-05-28T13:49:04Z","title":"Sudden Death and Birth of Entanglement Effects for Kerr-Nonlinear Coupler"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0905.4652","kind":"arxiv","version":2},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:27555911c786b47d5582fec087435c4f26d9c6354397d553df0760b07370259d","target":"record","created_at":"2026-05-18T04:12:55Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"600c4a040c308e6cf10a09238f42a5e668c2e8cef2cf52c6cb0d58677b3bcd1a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2009-05-28T13:49:04Z","title_canon_sha256":"06ff8743251ce8fa7de84f02964a02fe491d1918094daa505c1eae80c721b0fd"},"schema_version":"1.0","source":{"id":"0905.4652","kind":"arxiv","version":2}},"canonical_sha256":"395d36054a624f0e919886d99ffda63908295342f02edfe4f23003f2fff10b3e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"395d36054a624f0e919886d99ffda63908295342f02edfe4f23003f2fff10b3e","first_computed_at":"2026-05-18T04:12:55.794104Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:12:55.794104Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"g1ocNUPrLU/YJaPXdEc7byIYTomgejGGoz6g5tCwGW/MiRzdlb1cId7OV3+JS1oBFZJlWqrnAKIA0ktG5TR2AQ==","signature_status":"signed_v1","signed_at":"2026-05-18T04:12:55.794698Z","signed_message":"canonical_sha256_bytes"},"source_id":"0905.4652","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:27555911c786b47d5582fec087435c4f26d9c6354397d553df0760b07370259d","sha256:08ee0c8a79ca391d5806a446ff54c26af6802b33d3508fecc7da0b603c986d14"],"state_sha256":"409a77fd9acf261ec66d480842d6ec5ef4c018cc1f6bd70ce0da4b72bda3f50d"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ie2UMtTrFj2lUxixZmVkBUTxgjXabk77y7A7KHIdh5ibFwfy3EJRoE+05A86pYL0dFWlZCIXkwz8UdQtnlNYAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-02T04:17:31.496060Z","bundle_sha256":"7ac6a7ecb1a25ba71d8ed0c732a36d3ddec77a478cd5d604cc1b9845c8ce2968"}}