{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:KXXHZCR6R2ZREQ3AMLS6ZXDUXL","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":"f0999958e419fd68bf88c8e574bfbf9fe15ad55318ff3c3b4726c1dd56d5f69d","cross_cats_sorted":["physics.atom-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2009-11-19T19:07:47Z","title_canon_sha256":"5ede759374b03266542d9aa1a692e200f0862d255861516821cdee29a91b9b15"},"schema_version":"1.0","source":{"id":"0911.3867","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0911.3867","created_at":"2026-05-18T02:10:45Z"},{"alias_kind":"arxiv_version","alias_value":"0911.3867v1","created_at":"2026-05-18T02:10:45Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0911.3867","created_at":"2026-05-18T02:10:45Z"},{"alias_kind":"pith_short_12","alias_value":"KXXHZCR6R2ZR","created_at":"2026-05-18T12:26:00Z"},{"alias_kind":"pith_short_16","alias_value":"KXXHZCR6R2ZREQ3A","created_at":"2026-05-18T12:26:00Z"},{"alias_kind":"pith_short_8","alias_value":"KXXHZCR6","created_at":"2026-05-18T12:26:00Z"}],"graph_snapshots":[{"event_id":"sha256:af2d974f74bdb267ef810490dd3664aba25c237a22cda3df0467971f5bffda31","target":"graph","created_at":"2026-05-18T02:10:45Z","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 present a photoionization method to load single 40Ca ions in a linear Paul trap from an atomic beam. Neutral Ca I atoms are resonantly excited from the ground state to the intermediate 4s4p 1P_1-level using coherent 423nm radiation produced by single-pass second harmonic generation in a periodically poled KTiOPO_4 crystal pumped with an 120mW extended cavity diode laser. Ionization is then attained with a high-power light emitting diode imaged to the trap center, using an appropriately designed optical system composed of standard achromatic doublet lenses. The setup simplifies previous impl","authors_text":"C. Schuck, F. Rohde, J. Eschner, M. Almendros, M. Hennrich","cross_cats":["physics.atom-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2009-11-19T19:07:47Z","title":"Two-color photoionization of calcium using SHG and LED light"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0911.3867","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":"sha256:4fafb311f56ddc7d383c3f43920c2471ccfceb7e6cf3201ca95653f0388d449a","target":"record","created_at":"2026-05-18T02:10:45Z","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":"f0999958e419fd68bf88c8e574bfbf9fe15ad55318ff3c3b4726c1dd56d5f69d","cross_cats_sorted":["physics.atom-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2009-11-19T19:07:47Z","title_canon_sha256":"5ede759374b03266542d9aa1a692e200f0862d255861516821cdee29a91b9b15"},"schema_version":"1.0","source":{"id":"0911.3867","kind":"arxiv","version":1}},"canonical_sha256":"55ee7c8a3e8eb312436062e5ecdc74baf3e3455385fb0806adb223955f89297c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"55ee7c8a3e8eb312436062e5ecdc74baf3e3455385fb0806adb223955f89297c","first_computed_at":"2026-05-18T02:10:45.785131Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:10:45.785131Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"ROtmIqNUyERybhhKRM2eSRsHNvZbUv6ZOp+Z8sGLBvsekxhzYkjyWEiqIt3ynJ6RTcMotVBely4x2GnxsLgWAQ==","signature_status":"signed_v1","signed_at":"2026-05-18T02:10:45.785861Z","signed_message":"canonical_sha256_bytes"},"source_id":"0911.3867","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:4fafb311f56ddc7d383c3f43920c2471ccfceb7e6cf3201ca95653f0388d449a","sha256:af2d974f74bdb267ef810490dd3664aba25c237a22cda3df0467971f5bffda31"],"state_sha256":"f9c682b8e9fc804669fe98be67d460e8ffa18d0a89e87c06c91f4894878cace0"}