{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2006:IZ5KTRYMBXEALTWJP5QQPUMT4G","short_pith_number":"pith:IZ5KTRYM","canonical_record":{"source":{"id":"quant-ph/0604109","kind":"arxiv","version":2},"metadata":{"license":"","primary_cat":"quant-ph","submitted_at":"2006-04-14T22:51:04Z","cross_cats_sorted":[],"title_canon_sha256":"6fc9ba0acf1d3d59ac94982443ce9bece99ea584d2df26c6715ce4bfc2abed50","abstract_canon_sha256":"f0c3c76a9a00d9d7dd728116afe397a9b16f798c7776accea4f0d11dc5c9525b"},"schema_version":"1.0"},"canonical_sha256":"467aa9c70c0dc805cec97f6107d193e1aca5939c398692b543f4e818e8423816","source":{"kind":"arxiv","id":"quant-ph/0604109","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"quant-ph/0604109","created_at":"2026-05-18T01:37:56Z"},{"alias_kind":"arxiv_version","alias_value":"quant-ph/0604109v2","created_at":"2026-05-18T01:37:56Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.quant-ph/0604109","created_at":"2026-05-18T01:37:56Z"},{"alias_kind":"pith_short_12","alias_value":"IZ5KTRYMBXEA","created_at":"2026-05-18T12:25:54Z"},{"alias_kind":"pith_short_16","alias_value":"IZ5KTRYMBXEALTWJ","created_at":"2026-05-18T12:25:54Z"},{"alias_kind":"pith_short_8","alias_value":"IZ5KTRYM","created_at":"2026-05-18T12:25:54Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2006:IZ5KTRYMBXEALTWJP5QQPUMT4G","target":"record","payload":{"canonical_record":{"source":{"id":"quant-ph/0604109","kind":"arxiv","version":2},"metadata":{"license":"","primary_cat":"quant-ph","submitted_at":"2006-04-14T22:51:04Z","cross_cats_sorted":[],"title_canon_sha256":"6fc9ba0acf1d3d59ac94982443ce9bece99ea584d2df26c6715ce4bfc2abed50","abstract_canon_sha256":"f0c3c76a9a00d9d7dd728116afe397a9b16f798c7776accea4f0d11dc5c9525b"},"schema_version":"1.0"},"canonical_sha256":"467aa9c70c0dc805cec97f6107d193e1aca5939c398692b543f4e818e8423816","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:37:56.891459Z","signature_b64":"OoXFGVQKwNzVgfbSZqtOk1vQrvKteqIjkAhxPKxU39aIuyhibQ95pStQeqP3vJijfQ+t/IOQL1DyxKwUhR9hBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"467aa9c70c0dc805cec97f6107d193e1aca5939c398692b543f4e818e8423816","last_reissued_at":"2026-05-18T01:37:56.890603Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:37:56.890603Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"quant-ph/0604109","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":"2026-05-18T01:37:56Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"C1TKON6eCWjF5n/fOAeq+zPTM0SJJ9lveAg65re8246JrU4bCgg7cCeRQ+1RKVR7ugl84icIAQGUqrmXPBaRBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-24T21:03:10.406547Z"},"content_sha256":"ccc218d551934ed074b6c36fb3be7c1ac38909638bafb780e784a64941647eb3","schema_version":"1.0","event_id":"sha256:ccc218d551934ed074b6c36fb3be7c1ac38909638bafb780e784a64941647eb3"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2006:IZ5KTRYMBXEALTWJP5QQPUMT4G","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Universal observable detecting all two-qubit entanglement and determinant based separability tests","license":"","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Maciej Demianowicz, Pawel Horodecki, Remigiusz Augusiak","submitted_at":"2006-04-14T22:51:04Z","abstract_excerpt":"We construct a single observable measurement of which mean value on four copies of an {\\it unknown} two-qubit state is sufficient for unambiguous decision whether the state is separable or entangled. In other words, there exists a universal collective entanglement witness detecting all two-qubit entanglement. The test is directly linked to a function which characterizes to some extent the entanglement quantitatively. This function is an entanglement monotone under so--called local pure operations and classical communication (pLOCC) which preserve local dimensions. Moreover it provides tight up"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"quant-ph/0604109","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":"2026-05-18T01:37:56Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"1BJyoVQ7/L4E+ADTH/fFSvFn229yS9WL+GvvkXV1tOJ7HazX1xBvtjboA13xOYCthdZXpCoO+chVH8risD/OBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-24T21:03:10.407282Z"},"content_sha256":"baf3eb77fc35b7a2e5d9de638d2ceefdb36609f303bcb82385703ee0bbb4115b","schema_version":"1.0","event_id":"sha256:baf3eb77fc35b7a2e5d9de638d2ceefdb36609f303bcb82385703ee0bbb4115b"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/IZ5KTRYMBXEALTWJP5QQPUMT4G/bundle.json","state_url":"https://pith.science/pith/IZ5KTRYMBXEALTWJP5QQPUMT4G/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/IZ5KTRYMBXEALTWJP5QQPUMT4G/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":"2026-05-24T21:03:10Z","links":{"resolver":"https://pith.science/pith/IZ5KTRYMBXEALTWJP5QQPUMT4G","bundle":"https://pith.science/pith/IZ5KTRYMBXEALTWJP5QQPUMT4G/bundle.json","state":"https://pith.science/pith/IZ5KTRYMBXEALTWJP5QQPUMT4G/state.json","well_known_bundle":"https://pith.science/.well-known/pith/IZ5KTRYMBXEALTWJP5QQPUMT4G/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2006:IZ5KTRYMBXEALTWJP5QQPUMT4G","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":"f0c3c76a9a00d9d7dd728116afe397a9b16f798c7776accea4f0d11dc5c9525b","cross_cats_sorted":[],"license":"","primary_cat":"quant-ph","submitted_at":"2006-04-14T22:51:04Z","title_canon_sha256":"6fc9ba0acf1d3d59ac94982443ce9bece99ea584d2df26c6715ce4bfc2abed50"},"schema_version":"1.0","source":{"id":"quant-ph/0604109","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"quant-ph/0604109","created_at":"2026-05-18T01:37:56Z"},{"alias_kind":"arxiv_version","alias_value":"quant-ph/0604109v2","created_at":"2026-05-18T01:37:56Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.quant-ph/0604109","created_at":"2026-05-18T01:37:56Z"},{"alias_kind":"pith_short_12","alias_value":"IZ5KTRYMBXEA","created_at":"2026-05-18T12:25:54Z"},{"alias_kind":"pith_short_16","alias_value":"IZ5KTRYMBXEALTWJ","created_at":"2026-05-18T12:25:54Z"},{"alias_kind":"pith_short_8","alias_value":"IZ5KTRYM","created_at":"2026-05-18T12:25:54Z"}],"graph_snapshots":[{"event_id":"sha256:baf3eb77fc35b7a2e5d9de638d2ceefdb36609f303bcb82385703ee0bbb4115b","target":"graph","created_at":"2026-05-18T01:37:56Z","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 construct a single observable measurement of which mean value on four copies of an {\\it unknown} two-qubit state is sufficient for unambiguous decision whether the state is separable or entangled. In other words, there exists a universal collective entanglement witness detecting all two-qubit entanglement. The test is directly linked to a function which characterizes to some extent the entanglement quantitatively. This function is an entanglement monotone under so--called local pure operations and classical communication (pLOCC) which preserve local dimensions. Moreover it provides tight up","authors_text":"Maciej Demianowicz, Pawel Horodecki, Remigiusz Augusiak","cross_cats":[],"headline":"","license":"","primary_cat":"quant-ph","submitted_at":"2006-04-14T22:51:04Z","title":"Universal observable detecting all two-qubit entanglement and determinant based separability tests"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"quant-ph/0604109","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:ccc218d551934ed074b6c36fb3be7c1ac38909638bafb780e784a64941647eb3","target":"record","created_at":"2026-05-18T01:37:56Z","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":"f0c3c76a9a00d9d7dd728116afe397a9b16f798c7776accea4f0d11dc5c9525b","cross_cats_sorted":[],"license":"","primary_cat":"quant-ph","submitted_at":"2006-04-14T22:51:04Z","title_canon_sha256":"6fc9ba0acf1d3d59ac94982443ce9bece99ea584d2df26c6715ce4bfc2abed50"},"schema_version":"1.0","source":{"id":"quant-ph/0604109","kind":"arxiv","version":2}},"canonical_sha256":"467aa9c70c0dc805cec97f6107d193e1aca5939c398692b543f4e818e8423816","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"467aa9c70c0dc805cec97f6107d193e1aca5939c398692b543f4e818e8423816","first_computed_at":"2026-05-18T01:37:56.890603Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:37:56.890603Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"OoXFGVQKwNzVgfbSZqtOk1vQrvKteqIjkAhxPKxU39aIuyhibQ95pStQeqP3vJijfQ+t/IOQL1DyxKwUhR9hBA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:37:56.891459Z","signed_message":"canonical_sha256_bytes"},"source_id":"quant-ph/0604109","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:ccc218d551934ed074b6c36fb3be7c1ac38909638bafb780e784a64941647eb3","sha256:baf3eb77fc35b7a2e5d9de638d2ceefdb36609f303bcb82385703ee0bbb4115b"],"state_sha256":"f0c1e68948bbeda03b93f93201e4e0d672931784f1091d476d1ca7473ff6f077"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Vjjx3PIX0YVFCGJsSMYmTUpImA5JBqjrt9+viDq+D47YoNV5eN9Cb+OmAEQOSjBGC5hPXx1MJz+d3EUCfnIwDw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-24T21:03:10.411374Z","bundle_sha256":"2b3ace4e9a2e122ac4ca64005548b94e5fca67c7c2fccf45513b46edb0cad4f6"}}