{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:CS4ENGYWWK2CUXPD3HJO6ROQWP","short_pith_number":"pith:CS4ENGYW","canonical_record":{"source":{"id":"1809.05378","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2018-09-14T12:51:18Z","cross_cats_sorted":[],"title_canon_sha256":"da7acdad328ac431f61fe31ff879947f8feadf24f6837b156952e2396d6edc4c","abstract_canon_sha256":"2ac6d04749eaadadadc1f6b0458001b084d04c935e4d4c292fde06387786c3eb"},"schema_version":"1.0"},"canonical_sha256":"14b8469b16b2b42a5de3d9d2ef45d0b3e23df219f96ecabda51bbb8d7e8dae9b","source":{"kind":"arxiv","id":"1809.05378","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1809.05378","created_at":"2026-05-18T00:05:41Z"},{"alias_kind":"arxiv_version","alias_value":"1809.05378v1","created_at":"2026-05-18T00:05:41Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1809.05378","created_at":"2026-05-18T00:05:41Z"},{"alias_kind":"pith_short_12","alias_value":"CS4ENGYWWK2C","created_at":"2026-05-18T12:32:19Z"},{"alias_kind":"pith_short_16","alias_value":"CS4ENGYWWK2CUXPD","created_at":"2026-05-18T12:32:19Z"},{"alias_kind":"pith_short_8","alias_value":"CS4ENGYW","created_at":"2026-05-18T12:32:19Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:CS4ENGYWWK2CUXPD3HJO6ROQWP","target":"record","payload":{"canonical_record":{"source":{"id":"1809.05378","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2018-09-14T12:51:18Z","cross_cats_sorted":[],"title_canon_sha256":"da7acdad328ac431f61fe31ff879947f8feadf24f6837b156952e2396d6edc4c","abstract_canon_sha256":"2ac6d04749eaadadadc1f6b0458001b084d04c935e4d4c292fde06387786c3eb"},"schema_version":"1.0"},"canonical_sha256":"14b8469b16b2b42a5de3d9d2ef45d0b3e23df219f96ecabda51bbb8d7e8dae9b","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:05:41.634719Z","signature_b64":"1gX9Gijs62bxUBc5HcLcy0/OfBAaYWlwpc0kKeov/IR82GWHzeLQJUfmT62WqYq2PQj/rEzctQRw3PK1NWGVDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"14b8469b16b2b42a5de3d9d2ef45d0b3e23df219f96ecabda51bbb8d7e8dae9b","last_reissued_at":"2026-05-18T00:05:41.633734Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:05:41.633734Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1809.05378","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":"2026-05-18T00:05:41Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Qx//U9tKHq1eCCLJu0jDi2p4XlXdvt3xR0LoOFG+ErHdYDaVlzTS2FTtUrCVChAEmvaXJNsedvLW/+vgPN4yAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T19:48:22.850298Z"},"content_sha256":"80bd45ce8fe22ac406a7a9bfc4778fc123dd5aa9b8705ea36af9ea4ee9b40360","schema_version":"1.0","event_id":"sha256:80bd45ce8fe22ac406a7a9bfc4778fc123dd5aa9b8705ea36af9ea4ee9b40360"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:CS4ENGYWWK2CUXPD3HJO6ROQWP","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Challenges to miniaturizing cold atom technology for deployable vacuum metrology","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.atom-ph","authors_text":"Daniel S. Barker, Eric Norrgard, James A. Fedchak, Julia Scherschligt, Nikolai N. Klimov, Stephen Eckel","submitted_at":"2018-09-14T12:51:18Z","abstract_excerpt":"Cold atoms are excellent metrological tools; they currently realize SI time and, soon, SI pressure in the ultra-high (UHV) and extreme high vacuum (XHV) regimes. The development of primary, vacuum metrology based on cold atoms currently falls under the purview of national metrology institutes. Under the emerging paradigm of the \"quantum-SI\", these technologies become deployable (relatively easy-to-use sensors that integrate with other vacuum chambers), providing a primary realization of the pascal in the UHV and XHV for the end-user. Here, we discuss the challenges that this goal presents. We "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1809.05378","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":"2026-05-18T00:05:41Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"gsJ0wPBVsxI6ZZpTxHRxRu+dztTlriyj446XV0zIcH2rGAJC9kZZtaxC8heZGgtRLRyGyoQmOBC8RbknHbXoAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T19:48:22.850662Z"},"content_sha256":"0813951de5f70611265d479d5872621b352a447bf58922a3ea158f1d7f6e5621","schema_version":"1.0","event_id":"sha256:0813951de5f70611265d479d5872621b352a447bf58922a3ea158f1d7f6e5621"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/CS4ENGYWWK2CUXPD3HJO6ROQWP/bundle.json","state_url":"https://pith.science/pith/CS4ENGYWWK2CUXPD3HJO6ROQWP/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/CS4ENGYWWK2CUXPD3HJO6ROQWP/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":"2026-06-01T19:48:22Z","links":{"resolver":"https://pith.science/pith/CS4ENGYWWK2CUXPD3HJO6ROQWP","bundle":"https://pith.science/pith/CS4ENGYWWK2CUXPD3HJO6ROQWP/bundle.json","state":"https://pith.science/pith/CS4ENGYWWK2CUXPD3HJO6ROQWP/state.json","well_known_bundle":"https://pith.science/.well-known/pith/CS4ENGYWWK2CUXPD3HJO6ROQWP/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:CS4ENGYWWK2CUXPD3HJO6ROQWP","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":"2ac6d04749eaadadadc1f6b0458001b084d04c935e4d4c292fde06387786c3eb","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2018-09-14T12:51:18Z","title_canon_sha256":"da7acdad328ac431f61fe31ff879947f8feadf24f6837b156952e2396d6edc4c"},"schema_version":"1.0","source":{"id":"1809.05378","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1809.05378","created_at":"2026-05-18T00:05:41Z"},{"alias_kind":"arxiv_version","alias_value":"1809.05378v1","created_at":"2026-05-18T00:05:41Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1809.05378","created_at":"2026-05-18T00:05:41Z"},{"alias_kind":"pith_short_12","alias_value":"CS4ENGYWWK2C","created_at":"2026-05-18T12:32:19Z"},{"alias_kind":"pith_short_16","alias_value":"CS4ENGYWWK2CUXPD","created_at":"2026-05-18T12:32:19Z"},{"alias_kind":"pith_short_8","alias_value":"CS4ENGYW","created_at":"2026-05-18T12:32:19Z"}],"graph_snapshots":[{"event_id":"sha256:0813951de5f70611265d479d5872621b352a447bf58922a3ea158f1d7f6e5621","target":"graph","created_at":"2026-05-18T00:05:41Z","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":"Cold atoms are excellent metrological tools; they currently realize SI time and, soon, SI pressure in the ultra-high (UHV) and extreme high vacuum (XHV) regimes. The development of primary, vacuum metrology based on cold atoms currently falls under the purview of national metrology institutes. Under the emerging paradigm of the \"quantum-SI\", these technologies become deployable (relatively easy-to-use sensors that integrate with other vacuum chambers), providing a primary realization of the pascal in the UHV and XHV for the end-user. Here, we discuss the challenges that this goal presents. We ","authors_text":"Daniel S. Barker, Eric Norrgard, James A. Fedchak, Julia Scherschligt, Nikolai N. Klimov, Stephen Eckel","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2018-09-14T12:51:18Z","title":"Challenges to miniaturizing cold atom technology for deployable vacuum metrology"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1809.05378","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":"sha256:80bd45ce8fe22ac406a7a9bfc4778fc123dd5aa9b8705ea36af9ea4ee9b40360","target":"record","created_at":"2026-05-18T00:05:41Z","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":"2ac6d04749eaadadadc1f6b0458001b084d04c935e4d4c292fde06387786c3eb","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2018-09-14T12:51:18Z","title_canon_sha256":"da7acdad328ac431f61fe31ff879947f8feadf24f6837b156952e2396d6edc4c"},"schema_version":"1.0","source":{"id":"1809.05378","kind":"arxiv","version":1}},"canonical_sha256":"14b8469b16b2b42a5de3d9d2ef45d0b3e23df219f96ecabda51bbb8d7e8dae9b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"14b8469b16b2b42a5de3d9d2ef45d0b3e23df219f96ecabda51bbb8d7e8dae9b","first_computed_at":"2026-05-18T00:05:41.633734Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:05:41.633734Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"1gX9Gijs62bxUBc5HcLcy0/OfBAaYWlwpc0kKeov/IR82GWHzeLQJUfmT62WqYq2PQj/rEzctQRw3PK1NWGVDA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:05:41.634719Z","signed_message":"canonical_sha256_bytes"},"source_id":"1809.05378","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:80bd45ce8fe22ac406a7a9bfc4778fc123dd5aa9b8705ea36af9ea4ee9b40360","sha256:0813951de5f70611265d479d5872621b352a447bf58922a3ea158f1d7f6e5621"],"state_sha256":"ddaf3dbfb694e95f37273622e2dcadcbd49c2d657338f563c3709708b28606c0"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"OCVSQ4qQNKoTSRPA2UcHVI3Rci+Xe2k3d+KUFCRa98GFhi6wnEk4fwjJane67rdmXo76lIUj9JstWJ6GPy9hDQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-01T19:48:22.852499Z","bundle_sha256":"2cc223939d05fdec10dbc3d6bb0b2cdbdb7990b15defb11c96bc2b6235ba17c2"}}