{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2014:3OZIGSZK5QWOWF6VNVTK5ZAUNB","short_pith_number":"pith:3OZIGSZK","canonical_record":{"source":{"id":"1409.4235","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2014-09-15T12:53:33Z","cross_cats_sorted":["gr-qc"],"title_canon_sha256":"f703ce08078060a581465786fd39383f4146e439d204da23bc8d35704ce7bf02","abstract_canon_sha256":"b4ee2b47a10433ab70dfc31d93c716a7061941f2ce5e87cf17ab5ba3aa743ed4"},"schema_version":"1.0"},"canonical_sha256":"dbb2834b2aec2ceb17d56d66aee41468550a10f17e285cd3b208ae1a148eea0e","source":{"kind":"arxiv","id":"1409.4235","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1409.4235","created_at":"2026-05-18T01:21:37Z"},{"alias_kind":"arxiv_version","alias_value":"1409.4235v2","created_at":"2026-05-18T01:21:37Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1409.4235","created_at":"2026-05-18T01:21:37Z"},{"alias_kind":"pith_short_12","alias_value":"3OZIGSZK5QWO","created_at":"2026-05-18T12:28:11Z"},{"alias_kind":"pith_short_16","alias_value":"3OZIGSZK5QWOWF6V","created_at":"2026-05-18T12:28:11Z"},{"alias_kind":"pith_short_8","alias_value":"3OZIGSZK","created_at":"2026-05-18T12:28:11Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2014:3OZIGSZK5QWOWF6VNVTK5ZAUNB","target":"record","payload":{"canonical_record":{"source":{"id":"1409.4235","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2014-09-15T12:53:33Z","cross_cats_sorted":["gr-qc"],"title_canon_sha256":"f703ce08078060a581465786fd39383f4146e439d204da23bc8d35704ce7bf02","abstract_canon_sha256":"b4ee2b47a10433ab70dfc31d93c716a7061941f2ce5e87cf17ab5ba3aa743ed4"},"schema_version":"1.0"},"canonical_sha256":"dbb2834b2aec2ceb17d56d66aee41468550a10f17e285cd3b208ae1a148eea0e","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:21:37.920654Z","signature_b64":"4/ZB4GbWZ7gKrjWCEDiF5ImpEiMO68b6/eN08K7mNJDjnp5hVBUF0MOrWVgLo4EXzTYsNieh/RySXC0rFJjzDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"dbb2834b2aec2ceb17d56d66aee41468550a10f17e285cd3b208ae1a148eea0e","last_reissued_at":"2026-05-18T01:21:37.920027Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:21:37.920027Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1409.4235","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":"2026-05-18T01:21:37Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"LBeBvhEcgL6Yz9KS4qcrdPyAiOntIveKAjblOZVUY6gDBhXJifEKSCWgvaTefauVXvg14cjgsBu86FfdSeBnAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-09T15:42:11.647092Z"},"content_sha256":"9da67d833f70bc924d86e5d566ffe3a55647046993890a53f3eb196a524e3939","schema_version":"1.0","event_id":"sha256:9da67d833f70bc924d86e5d566ffe3a55647046993890a53f3eb196a524e3939"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2014:3OZIGSZK5QWOWF6VNVTK5ZAUNB","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Motion and gravity effects in the precision of quantum clocks","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["gr-qc"],"primary_cat":"quant-ph","authors_text":"Carlos Sab\\'in, G\\\"oran Johansson, Ivette Fuentes, Joel Lindkvist","submitted_at":"2014-09-15T12:53:33Z","abstract_excerpt":"We show that motion and gravity affect the precision of quantum clocks. We consider a localised quantum field as a fundamental model of a quantum clock moving in spacetime and show that its state is modified due to changes in acceleration. By computing the quantum Fisher information we determine how relativistic motion modifies the ultimate bound in the precision of the measurement of time. While in the absence of motion the squeezed vacuum is the ideal state for time estimation, we find that it is highly sensitive to the motion-induced degradation of the quantum Fisher information. We show th"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1409.4235","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":"2026-05-18T01:21:37Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"OBPzEy8IBBPsJAjAtvsDJa8QLIaqrL+EBakd8tF1YbYBdC7as+d8pmnjQqXLCc5XQVWLvRRZUi5mJe0dfVBKBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-09T15:42:11.647849Z"},"content_sha256":"be2ff75730e9d1aee2d743bcc6aa3f8e84b6ed50b2768567cf84259c1fd6564b","schema_version":"1.0","event_id":"sha256:be2ff75730e9d1aee2d743bcc6aa3f8e84b6ed50b2768567cf84259c1fd6564b"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/3OZIGSZK5QWOWF6VNVTK5ZAUNB/bundle.json","state_url":"https://pith.science/pith/3OZIGSZK5QWOWF6VNVTK5ZAUNB/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/3OZIGSZK5QWOWF6VNVTK5ZAUNB/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":"2026-06-09T15:42:11Z","links":{"resolver":"https://pith.science/pith/3OZIGSZK5QWOWF6VNVTK5ZAUNB","bundle":"https://pith.science/pith/3OZIGSZK5QWOWF6VNVTK5ZAUNB/bundle.json","state":"https://pith.science/pith/3OZIGSZK5QWOWF6VNVTK5ZAUNB/state.json","well_known_bundle":"https://pith.science/.well-known/pith/3OZIGSZK5QWOWF6VNVTK5ZAUNB/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:3OZIGSZK5QWOWF6VNVTK5ZAUNB","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":"b4ee2b47a10433ab70dfc31d93c716a7061941f2ce5e87cf17ab5ba3aa743ed4","cross_cats_sorted":["gr-qc"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2014-09-15T12:53:33Z","title_canon_sha256":"f703ce08078060a581465786fd39383f4146e439d204da23bc8d35704ce7bf02"},"schema_version":"1.0","source":{"id":"1409.4235","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1409.4235","created_at":"2026-05-18T01:21:37Z"},{"alias_kind":"arxiv_version","alias_value":"1409.4235v2","created_at":"2026-05-18T01:21:37Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1409.4235","created_at":"2026-05-18T01:21:37Z"},{"alias_kind":"pith_short_12","alias_value":"3OZIGSZK5QWO","created_at":"2026-05-18T12:28:11Z"},{"alias_kind":"pith_short_16","alias_value":"3OZIGSZK5QWOWF6V","created_at":"2026-05-18T12:28:11Z"},{"alias_kind":"pith_short_8","alias_value":"3OZIGSZK","created_at":"2026-05-18T12:28:11Z"}],"graph_snapshots":[{"event_id":"sha256:be2ff75730e9d1aee2d743bcc6aa3f8e84b6ed50b2768567cf84259c1fd6564b","target":"graph","created_at":"2026-05-18T01:21:37Z","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 show that motion and gravity affect the precision of quantum clocks. We consider a localised quantum field as a fundamental model of a quantum clock moving in spacetime and show that its state is modified due to changes in acceleration. By computing the quantum Fisher information we determine how relativistic motion modifies the ultimate bound in the precision of the measurement of time. While in the absence of motion the squeezed vacuum is the ideal state for time estimation, we find that it is highly sensitive to the motion-induced degradation of the quantum Fisher information. We show th","authors_text":"Carlos Sab\\'in, G\\\"oran Johansson, Ivette Fuentes, Joel Lindkvist","cross_cats":["gr-qc"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2014-09-15T12:53:33Z","title":"Motion and gravity effects in the precision of quantum clocks"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1409.4235","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":"sha256:9da67d833f70bc924d86e5d566ffe3a55647046993890a53f3eb196a524e3939","target":"record","created_at":"2026-05-18T01:21:37Z","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":"b4ee2b47a10433ab70dfc31d93c716a7061941f2ce5e87cf17ab5ba3aa743ed4","cross_cats_sorted":["gr-qc"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2014-09-15T12:53:33Z","title_canon_sha256":"f703ce08078060a581465786fd39383f4146e439d204da23bc8d35704ce7bf02"},"schema_version":"1.0","source":{"id":"1409.4235","kind":"arxiv","version":2}},"canonical_sha256":"dbb2834b2aec2ceb17d56d66aee41468550a10f17e285cd3b208ae1a148eea0e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"dbb2834b2aec2ceb17d56d66aee41468550a10f17e285cd3b208ae1a148eea0e","first_computed_at":"2026-05-18T01:21:37.920027Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:21:37.920027Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"4/ZB4GbWZ7gKrjWCEDiF5ImpEiMO68b6/eN08K7mNJDjnp5hVBUF0MOrWVgLo4EXzTYsNieh/RySXC0rFJjzDA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:21:37.920654Z","signed_message":"canonical_sha256_bytes"},"source_id":"1409.4235","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:9da67d833f70bc924d86e5d566ffe3a55647046993890a53f3eb196a524e3939","sha256:be2ff75730e9d1aee2d743bcc6aa3f8e84b6ed50b2768567cf84259c1fd6564b"],"state_sha256":"9cf8fb4c5a34f33c992c56ab332d5d197e79cc700200a25fd9e0d647a34f908e"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"j5iK+U+yZKVikOeJ3SBn8QcEv16MuzuMRbzGLEfOgGyjHilR3hrsCJ3qVHkyWR8ulWO1a1WoB4GGU6NwXxCfCA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-09T15:42:11.651839Z","bundle_sha256":"1fa2a45fa849c11572f9a80e42a900c7633ed8d157dee7d89d8231c361066e0a"}}