{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2024:TI43AJ2S6EMTFXG53MF4D5ZCRC","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":"2ff707a804049a24e45e1cef8153cd17354c28142b6962bfdfe7745ecc070d49","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2024-07-01T11:40:45Z","title_canon_sha256":"6ccdcf5ce7f079c5f8655bba26511626dc1ec73c289bf05293631e510b8ee2be"},"schema_version":"1.0","source":{"id":"2407.01196","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2407.01196","created_at":"2026-07-05T08:38:44Z"},{"alias_kind":"arxiv_version","alias_value":"2407.01196v1","created_at":"2026-07-05T08:38:44Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2407.01196","created_at":"2026-07-05T08:38:44Z"},{"alias_kind":"pith_short_12","alias_value":"TI43AJ2S6EMT","created_at":"2026-07-05T08:38:44Z"},{"alias_kind":"pith_short_16","alias_value":"TI43AJ2S6EMTFXG5","created_at":"2026-07-05T08:38:44Z"},{"alias_kind":"pith_short_8","alias_value":"TI43AJ2S","created_at":"2026-07-05T08:38:44Z"}],"graph_snapshots":[{"event_id":"sha256:29878cbffa6d546487c8064d385a7f5cd742c0bed773f3e509ce49179b5b12a4","target":"graph","created_at":"2026-07-05T08:38:44Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2407.01196/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Increasing the quantum information processing power with limited number of hosts is vital for achieving quantum advantage. Here we propose a novel scheme that achieves a scalable n-ion-2n-qubit quantum processor utilizing four internal levels of each ion, and experimentally implement a 1-ion-2-qubit universal processor using the valence electron spin and nuclear spin of a single 171Yb+ ion. Fidelities of single-qubit and two-qubit gates are around 0.98 obtained by quantum process tomography. Additionally, the Grover's algorithm is implemented with a successful rate exceeding 0.99. We provide e","authors_text":"Huiyi Zhang, Ji Bian, Le Luo, Min Ding, Pengfei Lu, Qifeng Lao, Teng Liu, Xinxin Rao","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2024-07-01T11:40:45Z","title":"Implementation of a scalable universal two-qubit quantum processor with electron and nuclear spins in a trapped ion"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2407.01196","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":"sha256:23c04c9f9858181befa0016cfdef0698e5a5cd378c5e2c96a4e18b7f30dc4677","target":"record","created_at":"2026-07-05T08:38:44Z","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":"2ff707a804049a24e45e1cef8153cd17354c28142b6962bfdfe7745ecc070d49","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2024-07-01T11:40:45Z","title_canon_sha256":"6ccdcf5ce7f079c5f8655bba26511626dc1ec73c289bf05293631e510b8ee2be"},"schema_version":"1.0","source":{"id":"2407.01196","kind":"arxiv","version":1}},"canonical_sha256":"9a39b02752f11932dcdddb0bc1f72288a57d0bb0806d5d0db7d894c54de5aa84","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"9a39b02752f11932dcdddb0bc1f72288a57d0bb0806d5d0db7d894c54de5aa84","first_computed_at":"2026-07-05T08:38:44.461695Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T08:38:44.461695Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"YXGYJagv12Tdvk0o1URA68Gye9Z2tApVjFfSV14K2w0wgPzjlknOvkXTNjkVwEg8GLtQmEqQadOlZ9/RDlfsBQ==","signature_status":"signed_v1","signed_at":"2026-07-05T08:38:44.462086Z","signed_message":"canonical_sha256_bytes"},"source_id":"2407.01196","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:23c04c9f9858181befa0016cfdef0698e5a5cd378c5e2c96a4e18b7f30dc4677","sha256:29878cbffa6d546487c8064d385a7f5cd742c0bed773f3e509ce49179b5b12a4"],"state_sha256":"b762729705bf28fa01b3eb17d8f57981287d50c9d20f04c6ff42944192e8b143"}