{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2025:BEJZRDOQZJC46YXZFWWWJOPWS7","short_pith_number":"pith:BEJZRDOQ","canonical_record":{"source":{"id":"2504.13047","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2025-04-17T16:03:05Z","cross_cats_sorted":[],"title_canon_sha256":"b353db895ca213c5d0edacef6c9bbb0650654f16d6e2b6ca4b4ffc0152bd144c","abstract_canon_sha256":"bc896a03305ed20a9b8a444d07dd7a3644cf02e642358776a81f2f09593956f7"},"schema_version":"1.0"},"canonical_sha256":"0913988dd0ca45cf62f92dad64b9f697c857e5aee9fc9ea8a6de34e549d26dbb","source":{"kind":"arxiv","id":"2504.13047","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2504.13047","created_at":"2026-07-05T10:50:36Z"},{"alias_kind":"arxiv_version","alias_value":"2504.13047v1","created_at":"2026-07-05T10:50:36Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2504.13047","created_at":"2026-07-05T10:50:36Z"},{"alias_kind":"pith_short_12","alias_value":"BEJZRDOQZJC4","created_at":"2026-07-05T10:50:36Z"},{"alias_kind":"pith_short_16","alias_value":"BEJZRDOQZJC46YXZ","created_at":"2026-07-05T10:50:36Z"},{"alias_kind":"pith_short_8","alias_value":"BEJZRDOQ","created_at":"2026-07-05T10:50:36Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2025:BEJZRDOQZJC46YXZFWWWJOPWS7","target":"record","payload":{"canonical_record":{"source":{"id":"2504.13047","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2025-04-17T16:03:05Z","cross_cats_sorted":[],"title_canon_sha256":"b353db895ca213c5d0edacef6c9bbb0650654f16d6e2b6ca4b4ffc0152bd144c","abstract_canon_sha256":"bc896a03305ed20a9b8a444d07dd7a3644cf02e642358776a81f2f09593956f7"},"schema_version":"1.0"},"canonical_sha256":"0913988dd0ca45cf62f92dad64b9f697c857e5aee9fc9ea8a6de34e549d26dbb","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T10:50:36.729364Z","signature_b64":"64PrFq/yI0/Ge7tcn+MTyyuC94oYuOTcwAfNNHhVkpPdjSYdGe4a/2qsOiNcGWtFElh88aB7JN+pzzVs2DbKBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"0913988dd0ca45cf62f92dad64b9f697c857e5aee9fc9ea8a6de34e549d26dbb","last_reissued_at":"2026-07-05T10:50:36.728829Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T10:50:36.728829Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2504.13047","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":"2026-07-05T10:50:36Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"8jTE+ebYCi0MDTfwonQw8e1HnYQWx+qpa2rHau5R+HvlospI6Bzf7QrMuIYeGPsFv3owbM9Cnq6kBEW61mxyCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-15T13:03:20.632528Z"},"content_sha256":"c3fc597a490774e28b315bff6e0156baeaf9a4795e0ba781bd80875f9f056517","schema_version":"1.0","event_id":"sha256:c3fc597a490774e28b315bff6e0156baeaf9a4795e0ba781bd80875f9f056517"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2025:BEJZRDOQZJC46YXZFWWWJOPWS7","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Observation of quantum entanglement between free electrons and photons","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Claus Ropers, Hao Jeng, Jan-Wilke Henke, Murat Sivis","submitted_at":"2025-04-17T16:03:05Z","abstract_excerpt":"Quantum entanglement is central to both the foundations of quantum mechanics and the development of new technologies in information processing, communication, and sensing. Entanglement has been realised in a variety of physical systems, spanning atoms, ions, photons, collective excitations, and hybrid combinations of particles. Remarkably, however, photons and free electrons -- the quanta of light and their most elementary sources -- have never been observed in an entangled state. Here, we demonstrate quantum entanglement between free electrons and photons. We show that entanglement is produce"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2504.13047","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/2504.13047/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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T10:50:36Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ho8hPQXO4jRunw4jrRIJIK63HkbsOsNp0htozHZbi3xrS+G1r7FBN1A5zDaVUT34rinMLU036SrF8wPvZ+pADg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-15T13:03:20.633514Z"},"content_sha256":"9c27f0ca8c4a454371c3f17ad0a4594014daa2380c966b3cd33bea9546222fd2","schema_version":"1.0","event_id":"sha256:9c27f0ca8c4a454371c3f17ad0a4594014daa2380c966b3cd33bea9546222fd2"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/BEJZRDOQZJC46YXZFWWWJOPWS7/bundle.json","state_url":"https://pith.science/pith/BEJZRDOQZJC46YXZFWWWJOPWS7/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/BEJZRDOQZJC46YXZFWWWJOPWS7/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":"2026-08-15T13:03:20Z","links":{"resolver":"https://pith.science/pith/BEJZRDOQZJC46YXZFWWWJOPWS7","bundle":"https://pith.science/pith/BEJZRDOQZJC46YXZFWWWJOPWS7/bundle.json","state":"https://pith.science/pith/BEJZRDOQZJC46YXZFWWWJOPWS7/state.json","well_known_bundle":"https://pith.science/.well-known/pith/BEJZRDOQZJC46YXZFWWWJOPWS7/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:BEJZRDOQZJC46YXZFWWWJOPWS7","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":"bc896a03305ed20a9b8a444d07dd7a3644cf02e642358776a81f2f09593956f7","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2025-04-17T16:03:05Z","title_canon_sha256":"b353db895ca213c5d0edacef6c9bbb0650654f16d6e2b6ca4b4ffc0152bd144c"},"schema_version":"1.0","source":{"id":"2504.13047","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2504.13047","created_at":"2026-07-05T10:50:36Z"},{"alias_kind":"arxiv_version","alias_value":"2504.13047v1","created_at":"2026-07-05T10:50:36Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2504.13047","created_at":"2026-07-05T10:50:36Z"},{"alias_kind":"pith_short_12","alias_value":"BEJZRDOQZJC4","created_at":"2026-07-05T10:50:36Z"},{"alias_kind":"pith_short_16","alias_value":"BEJZRDOQZJC46YXZ","created_at":"2026-07-05T10:50:36Z"},{"alias_kind":"pith_short_8","alias_value":"BEJZRDOQ","created_at":"2026-07-05T10:50:36Z"}],"graph_snapshots":[{"event_id":"sha256:9c27f0ca8c4a454371c3f17ad0a4594014daa2380c966b3cd33bea9546222fd2","target":"graph","created_at":"2026-07-05T10:50:36Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2504.13047/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Quantum entanglement is central to both the foundations of quantum mechanics and the development of new technologies in information processing, communication, and sensing. Entanglement has been realised in a variety of physical systems, spanning atoms, ions, photons, collective excitations, and hybrid combinations of particles. Remarkably, however, photons and free electrons -- the quanta of light and their most elementary sources -- have never been observed in an entangled state. Here, we demonstrate quantum entanglement between free electrons and photons. We show that entanglement is produce","authors_text":"Claus Ropers, Hao Jeng, Jan-Wilke Henke, Murat Sivis","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2025-04-17T16:03:05Z","title":"Observation of quantum entanglement between free electrons and photons"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2504.13047","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:c3fc597a490774e28b315bff6e0156baeaf9a4795e0ba781bd80875f9f056517","target":"record","created_at":"2026-07-05T10:50:36Z","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":"bc896a03305ed20a9b8a444d07dd7a3644cf02e642358776a81f2f09593956f7","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2025-04-17T16:03:05Z","title_canon_sha256":"b353db895ca213c5d0edacef6c9bbb0650654f16d6e2b6ca4b4ffc0152bd144c"},"schema_version":"1.0","source":{"id":"2504.13047","kind":"arxiv","version":1}},"canonical_sha256":"0913988dd0ca45cf62f92dad64b9f697c857e5aee9fc9ea8a6de34e549d26dbb","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"0913988dd0ca45cf62f92dad64b9f697c857e5aee9fc9ea8a6de34e549d26dbb","first_computed_at":"2026-07-05T10:50:36.728829Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T10:50:36.728829Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"64PrFq/yI0/Ge7tcn+MTyyuC94oYuOTcwAfNNHhVkpPdjSYdGe4a/2qsOiNcGWtFElh88aB7JN+pzzVs2DbKBQ==","signature_status":"signed_v1","signed_at":"2026-07-05T10:50:36.729364Z","signed_message":"canonical_sha256_bytes"},"source_id":"2504.13047","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c3fc597a490774e28b315bff6e0156baeaf9a4795e0ba781bd80875f9f056517","sha256:9c27f0ca8c4a454371c3f17ad0a4594014daa2380c966b3cd33bea9546222fd2"],"state_sha256":"a29453558a0c0e07ef6f4cd621715a9299b342c621bbb63a6e043d0c901cdbed"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"pkOrys3I7EyJJ+cKPaZO6xp3K5CGTNADREYZqtfk2KnIcI3jVLv1uA/vCICyw/3hKD30zOQteScaD+tG7dQrAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-15T13:03:20.642407Z","bundle_sha256":"1fe8313f1003649c1414a5702020bd5b90d41e7e6f409ef3a0fce7ac99de3674"}}