{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2020:HH2CTT5GOFR7QQKPE6YKRCWGCB","short_pith_number":"pith:HH2CTT5G","canonical_record":{"source":{"id":"2010.11156","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2020-10-21T17:23:39Z","cross_cats_sorted":["gr-qc","quant-ph"],"title_canon_sha256":"b604ccb239c4ad6fdad57a7961b3067c84b7e6d7c6fe74438f12062e470ee915","abstract_canon_sha256":"4e195a133f348e66e71a5a0f8b2bb099419f2eee83649547ed5a0bc485e0553d"},"schema_version":"1.0"},"canonical_sha256":"39f429cfa67163f8414f27b0a88ac6105b528e7179259da612c3ba397e2d2788","source":{"kind":"arxiv","id":"2010.11156","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2010.11156","created_at":"2026-07-05T03:19:02Z"},{"alias_kind":"arxiv_version","alias_value":"2010.11156v1","created_at":"2026-07-05T03:19:02Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2010.11156","created_at":"2026-07-05T03:19:02Z"},{"alias_kind":"pith_short_12","alias_value":"HH2CTT5GOFR7","created_at":"2026-07-05T03:19:02Z"},{"alias_kind":"pith_short_16","alias_value":"HH2CTT5GOFR7QQKP","created_at":"2026-07-05T03:19:02Z"},{"alias_kind":"pith_short_8","alias_value":"HH2CTT5G","created_at":"2026-07-05T03:19:02Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2020:HH2CTT5GOFR7QQKPE6YKRCWGCB","target":"record","payload":{"canonical_record":{"source":{"id":"2010.11156","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2020-10-21T17:23:39Z","cross_cats_sorted":["gr-qc","quant-ph"],"title_canon_sha256":"b604ccb239c4ad6fdad57a7961b3067c84b7e6d7c6fe74438f12062e470ee915","abstract_canon_sha256":"4e195a133f348e66e71a5a0f8b2bb099419f2eee83649547ed5a0bc485e0553d"},"schema_version":"1.0"},"canonical_sha256":"39f429cfa67163f8414f27b0a88ac6105b528e7179259da612c3ba397e2d2788","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T03:19:02.088119Z","signature_b64":"YWM+3DC19NDcXRXwiwgsOXE1AyFimhrADAFUPyALxjreQCpAeMvZssY5EhVIuIErZrGFayoBObhBWLCV2tm3DA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"39f429cfa67163f8414f27b0a88ac6105b528e7179259da612c3ba397e2d2788","last_reissued_at":"2026-07-05T03:19:02.087603Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T03:19:02.087603Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2010.11156","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":"2026-07-05T03:19:02Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"bklAxNbif4MrcZtTA/gHV8mwKCtq68RwVmZlqt93F4u1W7Ci0RGslqdS2cSW9we/AVAP07xOJKM1vIyDXjnIBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-05T13:54:03.894191Z"},"content_sha256":"480504f205e90f5a0c210472f6a7caa222f4151b5a29623357ed654885485e86","schema_version":"1.0","event_id":"sha256:480504f205e90f5a0c210472f6a7caa222f4151b5a29623357ed654885485e86"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2020:HH2CTT5GOFR7QQKPE6YKRCWGCB","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Measuring gravitational time dilation with delocalized quantum superpositions","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["gr-qc","quant-ph"],"primary_cat":"physics.atom-ph","authors_text":"Albert Roura, Christian Schubert, Dennis Schlippert, Ernst M. Rasel","submitted_at":"2020-10-21T17:23:39Z","abstract_excerpt":"Atomic clocks can measure the gravitational redshift predicted by general relativity with great accuracy and for height differences as little as 1 cm. All existing experiments, however, involve the comparison of two independent clocks at different locations rather than a single clock in a delocalized quantum superposition. Here we present an interferometry scheme employing group-II-type atoms, such as Sr or Yb, capable of measuring the gravitational time dilation in a coherent superposition of atomic wave packets at two different heights. In contrast to other recent proposals, there is no need"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2010.11156","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/2010.11156/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":"2026-07-05T03:19:02Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"2Sb4TJv39bZpAMU0Ubp/Gge2gbMbNdNyJLgiu2ZgiH4X72uC0yehTCU21Tve2aHsBpJxdehNQW9OtB3X8BuQAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-05T13:54:03.894585Z"},"content_sha256":"4bb9a4f01d403ede0bdecc140f28de4145a533dd744c976334e8075e85b096fa","schema_version":"1.0","event_id":"sha256:4bb9a4f01d403ede0bdecc140f28de4145a533dd744c976334e8075e85b096fa"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/HH2CTT5GOFR7QQKPE6YKRCWGCB/bundle.json","state_url":"https://pith.science/pith/HH2CTT5GOFR7QQKPE6YKRCWGCB/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/HH2CTT5GOFR7QQKPE6YKRCWGCB/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":"2026-07-05T13:54:03Z","links":{"resolver":"https://pith.science/pith/HH2CTT5GOFR7QQKPE6YKRCWGCB","bundle":"https://pith.science/pith/HH2CTT5GOFR7QQKPE6YKRCWGCB/bundle.json","state":"https://pith.science/pith/HH2CTT5GOFR7QQKPE6YKRCWGCB/state.json","well_known_bundle":"https://pith.science/.well-known/pith/HH2CTT5GOFR7QQKPE6YKRCWGCB/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2020:HH2CTT5GOFR7QQKPE6YKRCWGCB","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":"4e195a133f348e66e71a5a0f8b2bb099419f2eee83649547ed5a0bc485e0553d","cross_cats_sorted":["gr-qc","quant-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2020-10-21T17:23:39Z","title_canon_sha256":"b604ccb239c4ad6fdad57a7961b3067c84b7e6d7c6fe74438f12062e470ee915"},"schema_version":"1.0","source":{"id":"2010.11156","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2010.11156","created_at":"2026-07-05T03:19:02Z"},{"alias_kind":"arxiv_version","alias_value":"2010.11156v1","created_at":"2026-07-05T03:19:02Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2010.11156","created_at":"2026-07-05T03:19:02Z"},{"alias_kind":"pith_short_12","alias_value":"HH2CTT5GOFR7","created_at":"2026-07-05T03:19:02Z"},{"alias_kind":"pith_short_16","alias_value":"HH2CTT5GOFR7QQKP","created_at":"2026-07-05T03:19:02Z"},{"alias_kind":"pith_short_8","alias_value":"HH2CTT5G","created_at":"2026-07-05T03:19:02Z"}],"graph_snapshots":[{"event_id":"sha256:4bb9a4f01d403ede0bdecc140f28de4145a533dd744c976334e8075e85b096fa","target":"graph","created_at":"2026-07-05T03:19:02Z","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/2010.11156/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Atomic clocks can measure the gravitational redshift predicted by general relativity with great accuracy and for height differences as little as 1 cm. All existing experiments, however, involve the comparison of two independent clocks at different locations rather than a single clock in a delocalized quantum superposition. Here we present an interferometry scheme employing group-II-type atoms, such as Sr or Yb, capable of measuring the gravitational time dilation in a coherent superposition of atomic wave packets at two different heights. In contrast to other recent proposals, there is no need","authors_text":"Albert Roura, Christian Schubert, Dennis Schlippert, Ernst M. Rasel","cross_cats":["gr-qc","quant-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2020-10-21T17:23:39Z","title":"Measuring gravitational time dilation with delocalized quantum superpositions"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2010.11156","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":"sha256:480504f205e90f5a0c210472f6a7caa222f4151b5a29623357ed654885485e86","target":"record","created_at":"2026-07-05T03:19:02Z","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":"4e195a133f348e66e71a5a0f8b2bb099419f2eee83649547ed5a0bc485e0553d","cross_cats_sorted":["gr-qc","quant-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2020-10-21T17:23:39Z","title_canon_sha256":"b604ccb239c4ad6fdad57a7961b3067c84b7e6d7c6fe74438f12062e470ee915"},"schema_version":"1.0","source":{"id":"2010.11156","kind":"arxiv","version":1}},"canonical_sha256":"39f429cfa67163f8414f27b0a88ac6105b528e7179259da612c3ba397e2d2788","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"39f429cfa67163f8414f27b0a88ac6105b528e7179259da612c3ba397e2d2788","first_computed_at":"2026-07-05T03:19:02.087603Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T03:19:02.087603Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"YWM+3DC19NDcXRXwiwgsOXE1AyFimhrADAFUPyALxjreQCpAeMvZssY5EhVIuIErZrGFayoBObhBWLCV2tm3DA==","signature_status":"signed_v1","signed_at":"2026-07-05T03:19:02.088119Z","signed_message":"canonical_sha256_bytes"},"source_id":"2010.11156","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:480504f205e90f5a0c210472f6a7caa222f4151b5a29623357ed654885485e86","sha256:4bb9a4f01d403ede0bdecc140f28de4145a533dd744c976334e8075e85b096fa"],"state_sha256":"e1142c1c1ed9fdf3825ab2ad766366d3eae3611a0633c991380f98067fd8cd7b"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Kj+mzwraMPd937mTaIR3/5sEnCk6jfFs8XxgbIZFo8B/kHlSmQiOg6WOkwpsyX9Kneq6JXbVuV4sQ9AnHxZKBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-05T13:54:03.896717Z","bundle_sha256":"41202e2aa742789f12d0695ee4dd02bfd4e53cc3cdbe082ba4b817f131b1b28b"}}