{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:Y5UX2MC5MV3Q5RFXPHKQ5FK36F","short_pith_number":"pith:Y5UX2MC5","canonical_record":{"source":{"id":"1601.00758","kind":"arxiv","version":5},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2016-01-05T07:38:12Z","cross_cats_sorted":[],"title_canon_sha256":"653c61faaafd229e94f96ef0ef4c3a7139780d805f16c8b0e2a9b281b1632215","abstract_canon_sha256":"9ceb5282ac575e1f43e47c07c24700779ff12f2e54a552fd36b2690f88bf0110"},"schema_version":"1.0"},"canonical_sha256":"c7697d305d65770ec4b779d50e955bf145e5189808c8005d9aa5ce624ab9936d","source":{"kind":"arxiv","id":"1601.00758","version":5},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1601.00758","created_at":"2026-05-17T23:55:39Z"},{"alias_kind":"arxiv_version","alias_value":"1601.00758v5","created_at":"2026-05-17T23:55:39Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1601.00758","created_at":"2026-05-17T23:55:39Z"},{"alias_kind":"pith_short_12","alias_value":"Y5UX2MC5MV3Q","created_at":"2026-05-18T12:30:53Z"},{"alias_kind":"pith_short_16","alias_value":"Y5UX2MC5MV3Q5RFX","created_at":"2026-05-18T12:30:53Z"},{"alias_kind":"pith_short_8","alias_value":"Y5UX2MC5","created_at":"2026-05-18T12:30:53Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:Y5UX2MC5MV3Q5RFXPHKQ5FK36F","target":"record","payload":{"canonical_record":{"source":{"id":"1601.00758","kind":"arxiv","version":5},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2016-01-05T07:38:12Z","cross_cats_sorted":[],"title_canon_sha256":"653c61faaafd229e94f96ef0ef4c3a7139780d805f16c8b0e2a9b281b1632215","abstract_canon_sha256":"9ceb5282ac575e1f43e47c07c24700779ff12f2e54a552fd36b2690f88bf0110"},"schema_version":"1.0"},"canonical_sha256":"c7697d305d65770ec4b779d50e955bf145e5189808c8005d9aa5ce624ab9936d","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:55:39.129376Z","signature_b64":"K8ihds5zbhSeeyZF5Un+HTm2k5ClFPRIp95yRM4okR1ABANzWufFwzyY1xLu1p/1k4pbuGAg6T0TQ+moKqZrCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c7697d305d65770ec4b779d50e955bf145e5189808c8005d9aa5ce624ab9936d","last_reissued_at":"2026-05-17T23:55:39.128854Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:55:39.128854Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1601.00758","source_version":5,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-17T23:55:39Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"YNEYIqqKyXkMDzV8SsNcgrdF9DUU0yVd+9mI/GHB8Rm2WnHVTa803ejBwYaSK6mKxFv9P6P89X0sfWMZp27xAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-08T21:24:38.772211Z"},"content_sha256":"f6ebbdd0841a7af19004ebd5de1d914d10ee170630f8198f553225fba99a98e9","schema_version":"1.0","event_id":"sha256:f6ebbdd0841a7af19004ebd5de1d914d10ee170630f8198f553225fba99a98e9"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:Y5UX2MC5MV3Q5RFXPHKQ5FK36F","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Sympathetic cooling of $^{40}\\textbf{Ca}^+$ - $^{27}\\textbf{Al}^+$ ion pair crystal in a linear Paul trap","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.atom-ph","authors_text":"Hua-lin Shu, Jian Cao, Jun-juan Shang, Kai-feng Cui, Shao-mao Wang, Xue-ren Huang","submitted_at":"2016-01-05T07:38:12Z","abstract_excerpt":"The $^{27}$Al$^+$ ion optical clock is one of the most attractive optical clocks due to its own advantages, such as low blackbody radiation shift at room temperature and insensitive to the magnetic drift. However, it cannot be laser-cooled directly in the absence of 167 nm laser to date. This problem can be solved by sympathetic cooling. In this work, a linear Paul trap is used to trap both $^{40}$Ca$^{+}$ and $^{27}$Al$^+$ ions simultaneously, and a single Doppler-cooled $^{40}$Ca$^+$ ion is employed to sympathetically cool a single $^{27}$Al$^+$ ion. Thus a \"bright-dark\" two-ion crystal has "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1601.00758","kind":"arxiv","version":5},"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":"2026-05-17T23:55:39Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"RaaDVw1BR1j2sUW8JAWCvEsv3iy37kHUwtPGLYEELAU3clGGaen7+EsBE1NqTB0bO0N/K4owj8p98ibBkLv9Cw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-08T21:24:38.772937Z"},"content_sha256":"0a140d71b0190c4863c7574c554e7c270cd82d49ea208b0711b094d5ca871f3c","schema_version":"1.0","event_id":"sha256:0a140d71b0190c4863c7574c554e7c270cd82d49ea208b0711b094d5ca871f3c"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/Y5UX2MC5MV3Q5RFXPHKQ5FK36F/bundle.json","state_url":"https://pith.science/pith/Y5UX2MC5MV3Q5RFXPHKQ5FK36F/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/Y5UX2MC5MV3Q5RFXPHKQ5FK36F/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":"2026-06-08T21:24:38Z","links":{"resolver":"https://pith.science/pith/Y5UX2MC5MV3Q5RFXPHKQ5FK36F","bundle":"https://pith.science/pith/Y5UX2MC5MV3Q5RFXPHKQ5FK36F/bundle.json","state":"https://pith.science/pith/Y5UX2MC5MV3Q5RFXPHKQ5FK36F/state.json","well_known_bundle":"https://pith.science/.well-known/pith/Y5UX2MC5MV3Q5RFXPHKQ5FK36F/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:Y5UX2MC5MV3Q5RFXPHKQ5FK36F","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":"9ceb5282ac575e1f43e47c07c24700779ff12f2e54a552fd36b2690f88bf0110","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2016-01-05T07:38:12Z","title_canon_sha256":"653c61faaafd229e94f96ef0ef4c3a7139780d805f16c8b0e2a9b281b1632215"},"schema_version":"1.0","source":{"id":"1601.00758","kind":"arxiv","version":5}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1601.00758","created_at":"2026-05-17T23:55:39Z"},{"alias_kind":"arxiv_version","alias_value":"1601.00758v5","created_at":"2026-05-17T23:55:39Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1601.00758","created_at":"2026-05-17T23:55:39Z"},{"alias_kind":"pith_short_12","alias_value":"Y5UX2MC5MV3Q","created_at":"2026-05-18T12:30:53Z"},{"alias_kind":"pith_short_16","alias_value":"Y5UX2MC5MV3Q5RFX","created_at":"2026-05-18T12:30:53Z"},{"alias_kind":"pith_short_8","alias_value":"Y5UX2MC5","created_at":"2026-05-18T12:30:53Z"}],"graph_snapshots":[{"event_id":"sha256:0a140d71b0190c4863c7574c554e7c270cd82d49ea208b0711b094d5ca871f3c","target":"graph","created_at":"2026-05-17T23:55:39Z","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":"The $^{27}$Al$^+$ ion optical clock is one of the most attractive optical clocks due to its own advantages, such as low blackbody radiation shift at room temperature and insensitive to the magnetic drift. However, it cannot be laser-cooled directly in the absence of 167 nm laser to date. This problem can be solved by sympathetic cooling. In this work, a linear Paul trap is used to trap both $^{40}$Ca$^{+}$ and $^{27}$Al$^+$ ions simultaneously, and a single Doppler-cooled $^{40}$Ca$^+$ ion is employed to sympathetically cool a single $^{27}$Al$^+$ ion. Thus a \"bright-dark\" two-ion crystal has ","authors_text":"Hua-lin Shu, Jian Cao, Jun-juan Shang, Kai-feng Cui, Shao-mao Wang, Xue-ren Huang","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2016-01-05T07:38:12Z","title":"Sympathetic cooling of $^{40}\\textbf{Ca}^+$ - $^{27}\\textbf{Al}^+$ ion pair crystal in a linear Paul trap"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1601.00758","kind":"arxiv","version":5},"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:f6ebbdd0841a7af19004ebd5de1d914d10ee170630f8198f553225fba99a98e9","target":"record","created_at":"2026-05-17T23:55:39Z","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":"9ceb5282ac575e1f43e47c07c24700779ff12f2e54a552fd36b2690f88bf0110","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2016-01-05T07:38:12Z","title_canon_sha256":"653c61faaafd229e94f96ef0ef4c3a7139780d805f16c8b0e2a9b281b1632215"},"schema_version":"1.0","source":{"id":"1601.00758","kind":"arxiv","version":5}},"canonical_sha256":"c7697d305d65770ec4b779d50e955bf145e5189808c8005d9aa5ce624ab9936d","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c7697d305d65770ec4b779d50e955bf145e5189808c8005d9aa5ce624ab9936d","first_computed_at":"2026-05-17T23:55:39.128854Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:55:39.128854Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"K8ihds5zbhSeeyZF5Un+HTm2k5ClFPRIp95yRM4okR1ABANzWufFwzyY1xLu1p/1k4pbuGAg6T0TQ+moKqZrCA==","signature_status":"signed_v1","signed_at":"2026-05-17T23:55:39.129376Z","signed_message":"canonical_sha256_bytes"},"source_id":"1601.00758","source_kind":"arxiv","source_version":5}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:f6ebbdd0841a7af19004ebd5de1d914d10ee170630f8198f553225fba99a98e9","sha256:0a140d71b0190c4863c7574c554e7c270cd82d49ea208b0711b094d5ca871f3c"],"state_sha256":"58feb363de9b759306b11da51cd1f6eb5b58bb8b145d6939ab711f1527781c08"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"JqzkCMnTFplh/oX67MemAIV8ZQoToriL0T2dNmwRvYIBSuaOf8pdVTc33Kw6YJZ7lX7HuNRbTVSN6C1BQMaYBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-08T21:24:38.776309Z","bundle_sha256":"f5c8f0c3d579169058bae71a483ef9cfa181302d8ec167599a5f5e7e0aa3a819"}}