{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:ROU73DRTCWXQSMNG43BY2FHWI3","short_pith_number":"pith:ROU73DRT","canonical_record":{"source":{"id":"1506.08463","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2015-06-28T22:33:36Z","cross_cats_sorted":["cond-mat.quant-gas","quant-ph"],"title_canon_sha256":"7f1737c5ba93f88ff00af634dd240dd341aaf593ad8d27b6ab6573683167f2c2","abstract_canon_sha256":"0568578c4fbd70ba739220c55c3ff44fa07bf52d057275ee05f29d297f7458e5"},"schema_version":"1.0"},"canonical_sha256":"8ba9fd8e3315af0931a6e6c38d14f646d605a6aad8653e2b1676539639b32521","source":{"kind":"arxiv","id":"1506.08463","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1506.08463","created_at":"2026-05-18T01:15:23Z"},{"alias_kind":"arxiv_version","alias_value":"1506.08463v1","created_at":"2026-05-18T01:15:23Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1506.08463","created_at":"2026-05-18T01:15:23Z"},{"alias_kind":"pith_short_12","alias_value":"ROU73DRTCWXQ","created_at":"2026-05-18T12:29:39Z"},{"alias_kind":"pith_short_16","alias_value":"ROU73DRTCWXQSMNG","created_at":"2026-05-18T12:29:39Z"},{"alias_kind":"pith_short_8","alias_value":"ROU73DRT","created_at":"2026-05-18T12:29:39Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:ROU73DRTCWXQSMNG43BY2FHWI3","target":"record","payload":{"canonical_record":{"source":{"id":"1506.08463","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2015-06-28T22:33:36Z","cross_cats_sorted":["cond-mat.quant-gas","quant-ph"],"title_canon_sha256":"7f1737c5ba93f88ff00af634dd240dd341aaf593ad8d27b6ab6573683167f2c2","abstract_canon_sha256":"0568578c4fbd70ba739220c55c3ff44fa07bf52d057275ee05f29d297f7458e5"},"schema_version":"1.0"},"canonical_sha256":"8ba9fd8e3315af0931a6e6c38d14f646d605a6aad8653e2b1676539639b32521","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:15:23.529996Z","signature_b64":"hQFv1ypdF1VgBcEr9+Nhdf1Cz0Y+VvNMeZ/AuxBbACfBxTt43R8gT82m68ezZmp+1sMNheCDrAWOG0dqkLOhCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"8ba9fd8e3315af0931a6e6c38d14f646d605a6aad8653e2b1676539639b32521","last_reissued_at":"2026-05-18T01:15:23.529345Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:15:23.529345Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1506.08463","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":"2026-05-18T01:15:23Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"9xR13rZliAWE6xJPj9iUhT9OGOA4IFAcDXubYU7Tte2A2HHVLR1/bAmX++qmbOGyORFTkjjUmemy58Eo1jQQCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T07:06:44.579754Z"},"content_sha256":"3cf888307eb6f032674d36e7eca6e6873d9617a606a09f56295c46b96277916d","schema_version":"1.0","event_id":"sha256:3cf888307eb6f032674d36e7eca6e6873d9617a606a09f56295c46b96277916d"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:ROU73DRTCWXQSMNG43BY2FHWI3","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Van der Waals explosion of cold Rydberg clusters","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.quant-gas","quant-ph"],"primary_cat":"physics.atom-ph","authors_text":"C. Simonelli, D. Ciampini, E. Arimondo, G. Masella, M. Archimi, M. M. Valado, O. Morsch, R. Faoro, R. Mannella","submitted_at":"2015-06-28T22:33:36Z","abstract_excerpt":"We report on the direct measurement in real space of the effect of the van der Waals forces between individual Rydberg atoms on their external degrees of freedom. Clusters of Rydberg atoms with inter-particle distances of around 5 {\\mu}m are created by first generating a small number of seed excitations in a magneto-optical trap, followed by off-resonant excitation that leads to a chain of facilitated excitation events. After a variable expansion time the Rydberg atoms are field ionized, and from the arrival time distributions the size of the Rydberg cluster after expansion is calculated. Our "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1506.08463","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":"2026-05-18T01:15:23Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Qzcvgxcff5X3YHIGXZgIh5nMLH2yLEsYwzjBX0FoH5SflqdWLpAvVldsc0lsKYwcfkO5ywjlV3lQSuTrTUGcDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T07:06:44.580478Z"},"content_sha256":"1e7a5d443446651b4874474426828b60b1605d1a5de68db9a139645082d47764","schema_version":"1.0","event_id":"sha256:1e7a5d443446651b4874474426828b60b1605d1a5de68db9a139645082d47764"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/ROU73DRTCWXQSMNG43BY2FHWI3/bundle.json","state_url":"https://pith.science/pith/ROU73DRTCWXQSMNG43BY2FHWI3/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/ROU73DRTCWXQSMNG43BY2FHWI3/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":"2026-05-27T07:06:44Z","links":{"resolver":"https://pith.science/pith/ROU73DRTCWXQSMNG43BY2FHWI3","bundle":"https://pith.science/pith/ROU73DRTCWXQSMNG43BY2FHWI3/bundle.json","state":"https://pith.science/pith/ROU73DRTCWXQSMNG43BY2FHWI3/state.json","well_known_bundle":"https://pith.science/.well-known/pith/ROU73DRTCWXQSMNG43BY2FHWI3/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:ROU73DRTCWXQSMNG43BY2FHWI3","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":"0568578c4fbd70ba739220c55c3ff44fa07bf52d057275ee05f29d297f7458e5","cross_cats_sorted":["cond-mat.quant-gas","quant-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2015-06-28T22:33:36Z","title_canon_sha256":"7f1737c5ba93f88ff00af634dd240dd341aaf593ad8d27b6ab6573683167f2c2"},"schema_version":"1.0","source":{"id":"1506.08463","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1506.08463","created_at":"2026-05-18T01:15:23Z"},{"alias_kind":"arxiv_version","alias_value":"1506.08463v1","created_at":"2026-05-18T01:15:23Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1506.08463","created_at":"2026-05-18T01:15:23Z"},{"alias_kind":"pith_short_12","alias_value":"ROU73DRTCWXQ","created_at":"2026-05-18T12:29:39Z"},{"alias_kind":"pith_short_16","alias_value":"ROU73DRTCWXQSMNG","created_at":"2026-05-18T12:29:39Z"},{"alias_kind":"pith_short_8","alias_value":"ROU73DRT","created_at":"2026-05-18T12:29:39Z"}],"graph_snapshots":[{"event_id":"sha256:1e7a5d443446651b4874474426828b60b1605d1a5de68db9a139645082d47764","target":"graph","created_at":"2026-05-18T01:15:23Z","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 report on the direct measurement in real space of the effect of the van der Waals forces between individual Rydberg atoms on their external degrees of freedom. Clusters of Rydberg atoms with inter-particle distances of around 5 {\\mu}m are created by first generating a small number of seed excitations in a magneto-optical trap, followed by off-resonant excitation that leads to a chain of facilitated excitation events. After a variable expansion time the Rydberg atoms are field ionized, and from the arrival time distributions the size of the Rydberg cluster after expansion is calculated. Our ","authors_text":"C. Simonelli, D. Ciampini, E. Arimondo, G. Masella, M. Archimi, M. M. Valado, O. Morsch, R. Faoro, R. Mannella","cross_cats":["cond-mat.quant-gas","quant-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2015-06-28T22:33:36Z","title":"Van der Waals explosion of cold Rydberg clusters"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1506.08463","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":"sha256:3cf888307eb6f032674d36e7eca6e6873d9617a606a09f56295c46b96277916d","target":"record","created_at":"2026-05-18T01:15:23Z","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":"0568578c4fbd70ba739220c55c3ff44fa07bf52d057275ee05f29d297f7458e5","cross_cats_sorted":["cond-mat.quant-gas","quant-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2015-06-28T22:33:36Z","title_canon_sha256":"7f1737c5ba93f88ff00af634dd240dd341aaf593ad8d27b6ab6573683167f2c2"},"schema_version":"1.0","source":{"id":"1506.08463","kind":"arxiv","version":1}},"canonical_sha256":"8ba9fd8e3315af0931a6e6c38d14f646d605a6aad8653e2b1676539639b32521","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"8ba9fd8e3315af0931a6e6c38d14f646d605a6aad8653e2b1676539639b32521","first_computed_at":"2026-05-18T01:15:23.529345Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:15:23.529345Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"hQFv1ypdF1VgBcEr9+Nhdf1Cz0Y+VvNMeZ/AuxBbACfBxTt43R8gT82m68ezZmp+1sMNheCDrAWOG0dqkLOhCA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:15:23.529996Z","signed_message":"canonical_sha256_bytes"},"source_id":"1506.08463","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:3cf888307eb6f032674d36e7eca6e6873d9617a606a09f56295c46b96277916d","sha256:1e7a5d443446651b4874474426828b60b1605d1a5de68db9a139645082d47764"],"state_sha256":"1e074edc2890c00884a142fdde2d6ed3830135ff5b50d9bb490ff2f02a0168c8"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"SKehDYaGcvJp+g9OmOvfmE4hWxPpYFVTjokmwnHRTvr3OCJYEBL41dKVgtjCTTzVcKRpHhQhb1c1a2q4ZLfcDg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-27T07:06:44.584780Z","bundle_sha256":"c2643b71570e837512846c911b485e9a0229b3f13f66cc7781749c26e405ac59"}}