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Using a microgram source of radioactive material, we trap and laser-cool the synthetic $A$ = 133 radioisotope of barium II in a radio-frequency ion trap. Using the same, single trapped atom, we measure the isotope shifts and hyperfine structure of the $6^2 \\text{P}_{1/2}$ $\\leftrightarrow$ $6^2 \\text{S}_{1/2}$ and $6^2 \\text{P}_{1/2}$ $\\leftrightarrow$ $5^2 \\text{D}_{3/2}$ electronic transitions that"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1705.09736","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2017-05-26T23:07:26Z","cross_cats_sorted":["physics.atom-ph"],"title_canon_sha256":"3711251600a9190def06c3f4b16d2ab6bfb05c001a80c193d833a68c0c47fa9d","abstract_canon_sha256":"f04faaa66a5e497c5413f32e63c2690f5e42b33b48cbc7b69e9d9c0790cf055d"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:35:20.325601Z","signature_b64":"vBi04Y4tha59HRkn7EvWghA1u9R0NeSoQSMj8BxL5mIxIZPckP7NZO0Us9RJ6uShjabpURjD60r0sEKqSNT3CA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"67bd5b39ee6fd4b82d77eba1f286c420466b52884dd56023dfd60d090f214400","last_reissued_at":"2026-05-18T00:35:20.325139Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:35:20.325139Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Spectroscopy of a synthetic trapped ion qubit","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.atom-ph"],"primary_cat":"quant-ph","authors_text":"David Hucul, Eric R. 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