{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:Z3XQOCY2EWRTOXJJLOX45M3YCJ","short_pith_number":"pith:Z3XQOCY2","canonical_record":{"source":{"id":"1811.08346","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2018-11-20T16:21:28Z","cross_cats_sorted":[],"title_canon_sha256":"7a4a31a7f7e27e24216f885911d82dc70fd1bb4412e03008ca148cebc06ed5cb","abstract_canon_sha256":"5a2f2899554e9daa74a94eafad9fd4e495a3b02466b9cffe58ba4fde2c04b6b5"},"schema_version":"1.0"},"canonical_sha256":"ceef070b1a25a3375d295bafceb37812453cdd559bcafe960d1d6035660a9097","source":{"kind":"arxiv","id":"1811.08346","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1811.08346","created_at":"2026-05-17T23:57:07Z"},{"alias_kind":"arxiv_version","alias_value":"1811.08346v1","created_at":"2026-05-17T23:57:07Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1811.08346","created_at":"2026-05-17T23:57:07Z"},{"alias_kind":"pith_short_12","alias_value":"Z3XQOCY2EWRT","created_at":"2026-05-18T12:33:04Z"},{"alias_kind":"pith_short_16","alias_value":"Z3XQOCY2EWRTOXJJ","created_at":"2026-05-18T12:33:04Z"},{"alias_kind":"pith_short_8","alias_value":"Z3XQOCY2","created_at":"2026-05-18T12:33:04Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:Z3XQOCY2EWRTOXJJLOX45M3YCJ","target":"record","payload":{"canonical_record":{"source":{"id":"1811.08346","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2018-11-20T16:21:28Z","cross_cats_sorted":[],"title_canon_sha256":"7a4a31a7f7e27e24216f885911d82dc70fd1bb4412e03008ca148cebc06ed5cb","abstract_canon_sha256":"5a2f2899554e9daa74a94eafad9fd4e495a3b02466b9cffe58ba4fde2c04b6b5"},"schema_version":"1.0"},"canonical_sha256":"ceef070b1a25a3375d295bafceb37812453cdd559bcafe960d1d6035660a9097","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:57:07.255751Z","signature_b64":"a8KvYjBsxhgt19y1F20OYQKB/+Wv8RAoCxcb5sg5iCPM32AiINIU69hRq/29KmaQMOP4iep+Hlql1auMZJBpDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ceef070b1a25a3375d295bafceb37812453cdd559bcafe960d1d6035660a9097","last_reissued_at":"2026-05-17T23:57:07.255382Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:57:07.255382Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1811.08346","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":"2026-05-17T23:57:07Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"a8d5KRtBpwAvU9c86xr5jDvBIvyxyhSzbo5657zBgLW7Ryy6I58ovEAwaIVBT2WIc2ls698Q/GjpHukbgQtSBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-29T15:07:16.239902Z"},"content_sha256":"8e77ce4076ee8a4e36c64662dbd40ec39fa5f12afc7a600ede8a30ebccbad71b","schema_version":"1.0","event_id":"sha256:8e77ce4076ee8a4e36c64662dbd40ec39fa5f12afc7a600ede8a30ebccbad71b"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:Z3XQOCY2EWRTOXJJLOX45M3YCJ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Characteristics of long-lived persistent spectral holes in $Eu^{3+}:Y_{2}SiO_{5}$ at $1.2~K$","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.atom-ph","authors_text":"Alexander Yu. Nevsky, Eugen Wiens, Michael Hansen, Ren\\'e Oswald, Stephan Schiller","submitted_at":"2018-11-20T16:21:28Z","abstract_excerpt":"Properties of persistent spectral holes (SHs) relevant for frequency metrology have been investigated in the system $Eu^{3+}:Y_{2}SiO_{5}$ (0.5%) at crystallographic site 1 and a temperature of $1.2$ Kelvin. Hole linewidths as small as $0.6~kHz$ have been reliably achieved. The theoretically predicted $T^4$-dependence of the frequency shift with temperature has been confirmed with high precision. The thermal hysteresis of the SH frequency between $1.15~K$ and $4.1~K$ was measured to be less than $6\\cdot10^{-3}$ fractionally. After initially burning a large ensemble of SHs, their properties wer"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1811.08346","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":"2026-05-17T23:57:07Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"z8YH0WKmd2QmwDld9DQB6mxV8p0TBk9lH9AfvsiaB2knv4Xky2NDSjsrrzYdGX1/VjMUudLnG/ebugYCK/INBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-29T15:07:16.240542Z"},"content_sha256":"2fc0d743cc51542d4e9bef8dfa39c0dc0ad5ec1dd2bc7ac424ffe5dd7195758a","schema_version":"1.0","event_id":"sha256:2fc0d743cc51542d4e9bef8dfa39c0dc0ad5ec1dd2bc7ac424ffe5dd7195758a"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/Z3XQOCY2EWRTOXJJLOX45M3YCJ/bundle.json","state_url":"https://pith.science/pith/Z3XQOCY2EWRTOXJJLOX45M3YCJ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/Z3XQOCY2EWRTOXJJLOX45M3YCJ/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":"2026-05-29T15:07:16Z","links":{"resolver":"https://pith.science/pith/Z3XQOCY2EWRTOXJJLOX45M3YCJ","bundle":"https://pith.science/pith/Z3XQOCY2EWRTOXJJLOX45M3YCJ/bundle.json","state":"https://pith.science/pith/Z3XQOCY2EWRTOXJJLOX45M3YCJ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/Z3XQOCY2EWRTOXJJLOX45M3YCJ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:Z3XQOCY2EWRTOXJJLOX45M3YCJ","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":"5a2f2899554e9daa74a94eafad9fd4e495a3b02466b9cffe58ba4fde2c04b6b5","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2018-11-20T16:21:28Z","title_canon_sha256":"7a4a31a7f7e27e24216f885911d82dc70fd1bb4412e03008ca148cebc06ed5cb"},"schema_version":"1.0","source":{"id":"1811.08346","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1811.08346","created_at":"2026-05-17T23:57:07Z"},{"alias_kind":"arxiv_version","alias_value":"1811.08346v1","created_at":"2026-05-17T23:57:07Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1811.08346","created_at":"2026-05-17T23:57:07Z"},{"alias_kind":"pith_short_12","alias_value":"Z3XQOCY2EWRT","created_at":"2026-05-18T12:33:04Z"},{"alias_kind":"pith_short_16","alias_value":"Z3XQOCY2EWRTOXJJ","created_at":"2026-05-18T12:33:04Z"},{"alias_kind":"pith_short_8","alias_value":"Z3XQOCY2","created_at":"2026-05-18T12:33:04Z"}],"graph_snapshots":[{"event_id":"sha256:2fc0d743cc51542d4e9bef8dfa39c0dc0ad5ec1dd2bc7ac424ffe5dd7195758a","target":"graph","created_at":"2026-05-17T23:57:07Z","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":"Properties of persistent spectral holes (SHs) relevant for frequency metrology have been investigated in the system $Eu^{3+}:Y_{2}SiO_{5}$ (0.5%) at crystallographic site 1 and a temperature of $1.2$ Kelvin. Hole linewidths as small as $0.6~kHz$ have been reliably achieved. The theoretically predicted $T^4$-dependence of the frequency shift with temperature has been confirmed with high precision. The thermal hysteresis of the SH frequency between $1.15~K$ and $4.1~K$ was measured to be less than $6\\cdot10^{-3}$ fractionally. After initially burning a large ensemble of SHs, their properties wer","authors_text":"Alexander Yu. Nevsky, Eugen Wiens, Michael Hansen, Ren\\'e Oswald, Stephan Schiller","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2018-11-20T16:21:28Z","title":"Characteristics of long-lived persistent spectral holes in $Eu^{3+}:Y_{2}SiO_{5}$ at $1.2~K$"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1811.08346","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":"sha256:8e77ce4076ee8a4e36c64662dbd40ec39fa5f12afc7a600ede8a30ebccbad71b","target":"record","created_at":"2026-05-17T23:57:07Z","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":"5a2f2899554e9daa74a94eafad9fd4e495a3b02466b9cffe58ba4fde2c04b6b5","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2018-11-20T16:21:28Z","title_canon_sha256":"7a4a31a7f7e27e24216f885911d82dc70fd1bb4412e03008ca148cebc06ed5cb"},"schema_version":"1.0","source":{"id":"1811.08346","kind":"arxiv","version":1}},"canonical_sha256":"ceef070b1a25a3375d295bafceb37812453cdd559bcafe960d1d6035660a9097","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ceef070b1a25a3375d295bafceb37812453cdd559bcafe960d1d6035660a9097","first_computed_at":"2026-05-17T23:57:07.255382Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:57:07.255382Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"a8KvYjBsxhgt19y1F20OYQKB/+Wv8RAoCxcb5sg5iCPM32AiINIU69hRq/29KmaQMOP4iep+Hlql1auMZJBpDg==","signature_status":"signed_v1","signed_at":"2026-05-17T23:57:07.255751Z","signed_message":"canonical_sha256_bytes"},"source_id":"1811.08346","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:8e77ce4076ee8a4e36c64662dbd40ec39fa5f12afc7a600ede8a30ebccbad71b","sha256:2fc0d743cc51542d4e9bef8dfa39c0dc0ad5ec1dd2bc7ac424ffe5dd7195758a"],"state_sha256":"9ad4e28bb05c266f6ef22b1e16830beda5668bf622bc7e7d8a2ab98610412980"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"GF+vO3d2o/pr4cBP58B3nK8MB+p3cez2RsbuBiDsa332+Z0D2Fvl2DCZmtRM8XB5dojgbT0zMnD3xYbtmMB/BA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-29T15:07:16.244268Z","bundle_sha256":"c1754ff52f49afba9ada1b776d173478b023a7b5d0578a303c9062771a47aac5"}}