{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2008:XKDBJ2FWXPL3EJJDFSNK7WSEBN","short_pith_number":"pith:XKDBJ2FW","canonical_record":{"source":{"id":"0811.3399","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2008-11-20T19:39:06Z","cross_cats_sorted":[],"title_canon_sha256":"d383c1cd7abf4accec084546a4bd34507a13a39b1ce2b490f494df5ec65437d7","abstract_canon_sha256":"bd9e210fc413a8beb8085f9131f45838ef86f241f0117be32c2dd07a8332f461"},"schema_version":"1.0"},"canonical_sha256":"ba8614e8b6bbd7b225232c9aafda440b5bc334ad53869718122e9e4132b0a86f","source":{"kind":"arxiv","id":"0811.3399","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0811.3399","created_at":"2026-05-18T02:15:13Z"},{"alias_kind":"arxiv_version","alias_value":"0811.3399v2","created_at":"2026-05-18T02:15:13Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0811.3399","created_at":"2026-05-18T02:15:13Z"},{"alias_kind":"pith_short_12","alias_value":"XKDBJ2FWXPL3","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_16","alias_value":"XKDBJ2FWXPL3EJJD","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_8","alias_value":"XKDBJ2FW","created_at":"2026-05-18T12:25:58Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2008:XKDBJ2FWXPL3EJJDFSNK7WSEBN","target":"record","payload":{"canonical_record":{"source":{"id":"0811.3399","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2008-11-20T19:39:06Z","cross_cats_sorted":[],"title_canon_sha256":"d383c1cd7abf4accec084546a4bd34507a13a39b1ce2b490f494df5ec65437d7","abstract_canon_sha256":"bd9e210fc413a8beb8085f9131f45838ef86f241f0117be32c2dd07a8332f461"},"schema_version":"1.0"},"canonical_sha256":"ba8614e8b6bbd7b225232c9aafda440b5bc334ad53869718122e9e4132b0a86f","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:15:13.680005Z","signature_b64":"dSXcFLi5B7fhm5ExcOGR+TcIP0ClRjdV6srieuVzaIDMYuXr9nnbryguCG25O0k0xtiGs/NsPvCEmk8r1jsuCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ba8614e8b6bbd7b225232c9aafda440b5bc334ad53869718122e9e4132b0a86f","last_reissued_at":"2026-05-18T02:15:13.679242Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:15:13.679242Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0811.3399","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":"2026-05-18T02:15:13Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"sHuLlooSJeQ7ZSm2/koSTvjlyL8VyrnLRMgGz0rOzXByFNtu4u96e6eFzIspPDL7SdKyC5nWQs5bKi6BESloBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T13:03:31.624565Z"},"content_sha256":"10beba7f925ab7ccf43b829057cd1072acb26e5a46065428bfdf6f3e2b74d3ab","schema_version":"1.0","event_id":"sha256:10beba7f925ab7ccf43b829057cd1072acb26e5a46065428bfdf6f3e2b74d3ab"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2008:XKDBJ2FWXPL3EJJDFSNK7WSEBN","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Photoionisation loading of large Sr+ ion clouds with ultrafast pulses","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Jean-Pierre Likforman (MPQ), Luca Guidoni (MPQ), Quentin Glorieux (MPQ), Romain Dubessy (MPQ), Samuel Guibal (MPQ), S\\'ebastien Removille (MPQ), Thomas Coudreau (MPQ)","submitted_at":"2008-11-20T19:39:06Z","abstract_excerpt":"This paper reports on photoionisation loading based on ultrafast pulses of singly-ionised strontium ions in a linear Paul trap. We take advantage of an autoionising resonance of Sr neutral atoms to form Sr+ by two-photon absorption of femtosecond pulses at a wavelength of 431nm. We compare this technique to electron-bombardment ionisation and observe several advantages of photoionisation. It actually allows the loading of a pure Sr+ ion cloud in a low radio-frequency voltage amplitude regime. In these conditions up to 4x10^4 laser-cooled Sr+ ions were trapped."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0811.3399","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":"2026-05-18T02:15:13Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"HduBxiXwKvkMij0vwJhLuaifPejzFmEC0woCwf50/86oMZLu2ZyDDFelA5GiKaGyUrf83uqzBoAZKlcZzAqyAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T13:03:31.624918Z"},"content_sha256":"bd725109b850f6b94dd9d4bbe3e7cebcfbbc6bcb77b9ef7f1faba4ea253f7fef","schema_version":"1.0","event_id":"sha256:bd725109b850f6b94dd9d4bbe3e7cebcfbbc6bcb77b9ef7f1faba4ea253f7fef"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/XKDBJ2FWXPL3EJJDFSNK7WSEBN/bundle.json","state_url":"https://pith.science/pith/XKDBJ2FWXPL3EJJDFSNK7WSEBN/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/XKDBJ2FWXPL3EJJDFSNK7WSEBN/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":"2026-05-27T13:03:31Z","links":{"resolver":"https://pith.science/pith/XKDBJ2FWXPL3EJJDFSNK7WSEBN","bundle":"https://pith.science/pith/XKDBJ2FWXPL3EJJDFSNK7WSEBN/bundle.json","state":"https://pith.science/pith/XKDBJ2FWXPL3EJJDFSNK7WSEBN/state.json","well_known_bundle":"https://pith.science/.well-known/pith/XKDBJ2FWXPL3EJJDFSNK7WSEBN/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2008:XKDBJ2FWXPL3EJJDFSNK7WSEBN","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":"bd9e210fc413a8beb8085f9131f45838ef86f241f0117be32c2dd07a8332f461","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2008-11-20T19:39:06Z","title_canon_sha256":"d383c1cd7abf4accec084546a4bd34507a13a39b1ce2b490f494df5ec65437d7"},"schema_version":"1.0","source":{"id":"0811.3399","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0811.3399","created_at":"2026-05-18T02:15:13Z"},{"alias_kind":"arxiv_version","alias_value":"0811.3399v2","created_at":"2026-05-18T02:15:13Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0811.3399","created_at":"2026-05-18T02:15:13Z"},{"alias_kind":"pith_short_12","alias_value":"XKDBJ2FWXPL3","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_16","alias_value":"XKDBJ2FWXPL3EJJD","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_8","alias_value":"XKDBJ2FW","created_at":"2026-05-18T12:25:58Z"}],"graph_snapshots":[{"event_id":"sha256:bd725109b850f6b94dd9d4bbe3e7cebcfbbc6bcb77b9ef7f1faba4ea253f7fef","target":"graph","created_at":"2026-05-18T02:15:13Z","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":"This paper reports on photoionisation loading based on ultrafast pulses of singly-ionised strontium ions in a linear Paul trap. We take advantage of an autoionising resonance of Sr neutral atoms to form Sr+ by two-photon absorption of femtosecond pulses at a wavelength of 431nm. We compare this technique to electron-bombardment ionisation and observe several advantages of photoionisation. It actually allows the loading of a pure Sr+ ion cloud in a low radio-frequency voltage amplitude regime. In these conditions up to 4x10^4 laser-cooled Sr+ ions were trapped.","authors_text":"Jean-Pierre Likforman (MPQ), Luca Guidoni (MPQ), Quentin Glorieux (MPQ), Romain Dubessy (MPQ), Samuel Guibal (MPQ), S\\'ebastien Removille (MPQ), Thomas Coudreau (MPQ)","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2008-11-20T19:39:06Z","title":"Photoionisation loading of large Sr+ ion clouds with ultrafast pulses"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0811.3399","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":"sha256:10beba7f925ab7ccf43b829057cd1072acb26e5a46065428bfdf6f3e2b74d3ab","target":"record","created_at":"2026-05-18T02:15:13Z","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":"bd9e210fc413a8beb8085f9131f45838ef86f241f0117be32c2dd07a8332f461","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2008-11-20T19:39:06Z","title_canon_sha256":"d383c1cd7abf4accec084546a4bd34507a13a39b1ce2b490f494df5ec65437d7"},"schema_version":"1.0","source":{"id":"0811.3399","kind":"arxiv","version":2}},"canonical_sha256":"ba8614e8b6bbd7b225232c9aafda440b5bc334ad53869718122e9e4132b0a86f","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ba8614e8b6bbd7b225232c9aafda440b5bc334ad53869718122e9e4132b0a86f","first_computed_at":"2026-05-18T02:15:13.679242Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:15:13.679242Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"dSXcFLi5B7fhm5ExcOGR+TcIP0ClRjdV6srieuVzaIDMYuXr9nnbryguCG25O0k0xtiGs/NsPvCEmk8r1jsuCQ==","signature_status":"signed_v1","signed_at":"2026-05-18T02:15:13.680005Z","signed_message":"canonical_sha256_bytes"},"source_id":"0811.3399","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:10beba7f925ab7ccf43b829057cd1072acb26e5a46065428bfdf6f3e2b74d3ab","sha256:bd725109b850f6b94dd9d4bbe3e7cebcfbbc6bcb77b9ef7f1faba4ea253f7fef"],"state_sha256":"7088b085926d77c9c625834231f9ff1079232075f976947cb0e42b631a5a0bba"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"aBeEVMEx0Rcxfyo14IRp7X03kwNU0GuA90FFb+oTXH/7WxEDhuXA0aIpWfWY3UWVKWTy2QFh24De1iCKogDnBg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-27T13:03:31.627130Z","bundle_sha256":"7b6e1bbc4b077f264cc36fd30c15986338b26362892dd800d0e7c1a0615bdd3a"}}