{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2011:OPP2SQ5ZCW2DKUQE6IJKEOEMDC","short_pith_number":"pith:OPP2SQ5Z","canonical_record":{"source":{"id":"1108.1955","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2011-08-06T15:00:36Z","cross_cats_sorted":[],"title_canon_sha256":"e1a43d9bac666df8259db919f4c14df2fee905ad3533acfce46469f8974265f7","abstract_canon_sha256":"1c061d4542acab72be0b7f84ca9ec8e3cee564f7e585d1799efc5044f0f7b567"},"schema_version":"1.0"},"canonical_sha256":"73dfa943b915b4355204f212a2388c18bc9eef9540714786503f7ae62fa6c791","source":{"kind":"arxiv","id":"1108.1955","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1108.1955","created_at":"2026-05-18T03:41:20Z"},{"alias_kind":"arxiv_version","alias_value":"1108.1955v1","created_at":"2026-05-18T03:41:20Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1108.1955","created_at":"2026-05-18T03:41:20Z"},{"alias_kind":"pith_short_12","alias_value":"OPP2SQ5ZCW2D","created_at":"2026-05-18T12:26:37Z"},{"alias_kind":"pith_short_16","alias_value":"OPP2SQ5ZCW2DKUQE","created_at":"2026-05-18T12:26:37Z"},{"alias_kind":"pith_short_8","alias_value":"OPP2SQ5Z","created_at":"2026-05-18T12:26:37Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2011:OPP2SQ5ZCW2DKUQE6IJKEOEMDC","target":"record","payload":{"canonical_record":{"source":{"id":"1108.1955","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2011-08-06T15:00:36Z","cross_cats_sorted":[],"title_canon_sha256":"e1a43d9bac666df8259db919f4c14df2fee905ad3533acfce46469f8974265f7","abstract_canon_sha256":"1c061d4542acab72be0b7f84ca9ec8e3cee564f7e585d1799efc5044f0f7b567"},"schema_version":"1.0"},"canonical_sha256":"73dfa943b915b4355204f212a2388c18bc9eef9540714786503f7ae62fa6c791","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:41:20.390984Z","signature_b64":"TfdUwYAYNZOHgUqMFacwvo9qFgWcdmqcYVx1HlI3VXauhqn8H0jye0ghf7qtUo2nDCB6MbTZHiI2BvKOQmKTDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"73dfa943b915b4355204f212a2388c18bc9eef9540714786503f7ae62fa6c791","last_reissued_at":"2026-05-18T03:41:20.390621Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:41:20.390621Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1108.1955","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T03:41:20Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"SdM9DRcAPdwTKqm3bWxVkHCW714xW6GhMlqKZLF58xSUFOqm1nXZb/7RIcN84oGhgNIZ6Q52DBjX6y8rTKXVBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T10:27:18.102874Z"},"content_sha256":"237ad4a552f9baafc3377ec83cf669fd79ee6f83f039751a667cb59661ec91ac","schema_version":"1.0","event_id":"sha256:237ad4a552f9baafc3377ec83cf669fd79ee6f83f039751a667cb59661ec91ac"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2011:OPP2SQ5ZCW2DKUQE6IJKEOEMDC","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Multiqubit entanglement of a general input state","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"E.C. Behrman, J.E. Steck","submitted_at":"2011-08-06T15:00:36Z","abstract_excerpt":"Measurement of entanglement remains an important problem for quantum information. We present the design and simulation of an experimental method for entanglement estimation for a general multiqubit state. The system can be in a pure or a mixed state, and it need not be \"close\" to any particular state. Our method, based on dynamic learning, does not require prior state reconstruction or lengthy optimization. Results for three-qubit systems compare favorably with known entanglement measures. The method is then extended to four- and five-qubit systems, with relative ease. As the size of the syste"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1108.1955","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":""},"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":"2026-05-18T03:41:20Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"zgz+InWeq14nhr/nSH3wkdT4cZsf3QJV0rHfcWSwJPpBk7gvF07fShnUWtidf3mS7mCgz5P/iTsieaugG+DfDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T10:27:18.103221Z"},"content_sha256":"8d12ce458bebae7c1fbc453ca0d04b9b2684d0fcb368a405ad03827459c0da26","schema_version":"1.0","event_id":"sha256:8d12ce458bebae7c1fbc453ca0d04b9b2684d0fcb368a405ad03827459c0da26"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/OPP2SQ5ZCW2DKUQE6IJKEOEMDC/bundle.json","state_url":"https://pith.science/pith/OPP2SQ5ZCW2DKUQE6IJKEOEMDC/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/OPP2SQ5ZCW2DKUQE6IJKEOEMDC/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":"2026-05-28T10:27:18Z","links":{"resolver":"https://pith.science/pith/OPP2SQ5ZCW2DKUQE6IJKEOEMDC","bundle":"https://pith.science/pith/OPP2SQ5ZCW2DKUQE6IJKEOEMDC/bundle.json","state":"https://pith.science/pith/OPP2SQ5ZCW2DKUQE6IJKEOEMDC/state.json","well_known_bundle":"https://pith.science/.well-known/pith/OPP2SQ5ZCW2DKUQE6IJKEOEMDC/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2011:OPP2SQ5ZCW2DKUQE6IJKEOEMDC","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":"1c061d4542acab72be0b7f84ca9ec8e3cee564f7e585d1799efc5044f0f7b567","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2011-08-06T15:00:36Z","title_canon_sha256":"e1a43d9bac666df8259db919f4c14df2fee905ad3533acfce46469f8974265f7"},"schema_version":"1.0","source":{"id":"1108.1955","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1108.1955","created_at":"2026-05-18T03:41:20Z"},{"alias_kind":"arxiv_version","alias_value":"1108.1955v1","created_at":"2026-05-18T03:41:20Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1108.1955","created_at":"2026-05-18T03:41:20Z"},{"alias_kind":"pith_short_12","alias_value":"OPP2SQ5ZCW2D","created_at":"2026-05-18T12:26:37Z"},{"alias_kind":"pith_short_16","alias_value":"OPP2SQ5ZCW2DKUQE","created_at":"2026-05-18T12:26:37Z"},{"alias_kind":"pith_short_8","alias_value":"OPP2SQ5Z","created_at":"2026-05-18T12:26:37Z"}],"graph_snapshots":[{"event_id":"sha256:8d12ce458bebae7c1fbc453ca0d04b9b2684d0fcb368a405ad03827459c0da26","target":"graph","created_at":"2026-05-18T03:41:20Z","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":"Measurement of entanglement remains an important problem for quantum information. We present the design and simulation of an experimental method for entanglement estimation for a general multiqubit state. The system can be in a pure or a mixed state, and it need not be \"close\" to any particular state. Our method, based on dynamic learning, does not require prior state reconstruction or lengthy optimization. Results for three-qubit systems compare favorably with known entanglement measures. The method is then extended to four- and five-qubit systems, with relative ease. As the size of the syste","authors_text":"E.C. Behrman, J.E. Steck","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2011-08-06T15:00:36Z","title":"Multiqubit entanglement of a general input state"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1108.1955","kind":"arxiv","version":1},"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":"sha256:237ad4a552f9baafc3377ec83cf669fd79ee6f83f039751a667cb59661ec91ac","target":"record","created_at":"2026-05-18T03:41:20Z","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":"1c061d4542acab72be0b7f84ca9ec8e3cee564f7e585d1799efc5044f0f7b567","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2011-08-06T15:00:36Z","title_canon_sha256":"e1a43d9bac666df8259db919f4c14df2fee905ad3533acfce46469f8974265f7"},"schema_version":"1.0","source":{"id":"1108.1955","kind":"arxiv","version":1}},"canonical_sha256":"73dfa943b915b4355204f212a2388c18bc9eef9540714786503f7ae62fa6c791","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"73dfa943b915b4355204f212a2388c18bc9eef9540714786503f7ae62fa6c791","first_computed_at":"2026-05-18T03:41:20.390621Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:41:20.390621Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"TfdUwYAYNZOHgUqMFacwvo9qFgWcdmqcYVx1HlI3VXauhqn8H0jye0ghf7qtUo2nDCB6MbTZHiI2BvKOQmKTDA==","signature_status":"signed_v1","signed_at":"2026-05-18T03:41:20.390984Z","signed_message":"canonical_sha256_bytes"},"source_id":"1108.1955","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:237ad4a552f9baafc3377ec83cf669fd79ee6f83f039751a667cb59661ec91ac","sha256:8d12ce458bebae7c1fbc453ca0d04b9b2684d0fcb368a405ad03827459c0da26"],"state_sha256":"df57b097ac52d7db36df51dd8aba9abe85e6a38bfb6e82f1c299bf35cf70fda1"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ZzSPvBF1vwotEgXxKSQMkxiiSD/x1R3yupDkN0PapmdXy5wF1NtOfEDcOK7KwmAIY/q0hLJ4lHPfH0Mf9pfhAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-28T10:27:18.105832Z","bundle_sha256":"57293115e2193083ff0540b86549ab83cc799898e60f457c55ed6969999d931d"}}