{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2004:HIFRCMPB445PYX62I4EITDE5QE","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":"07cdeb5c4cec727d15ff545bf52bc45d318d7206702582c03a2a14181ecf5818","cross_cats_sorted":[],"license":"","primary_cat":"quant-ph","submitted_at":"2004-08-05T13:41:25Z","title_canon_sha256":"2fc32128ecba955dcfe00a9b843f97195befc1be677b26f2ef54e6243ea4d15a"},"schema_version":"1.0","source":{"id":"quant-ph/0408037","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"quant-ph/0408037","created_at":"2026-05-18T01:05:03Z"},{"alias_kind":"arxiv_version","alias_value":"quant-ph/0408037v1","created_at":"2026-05-18T01:05:03Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.quant-ph/0408037","created_at":"2026-05-18T01:05:03Z"},{"alias_kind":"pith_short_12","alias_value":"HIFRCMPB445P","created_at":"2026-05-18T12:25:52Z"},{"alias_kind":"pith_short_16","alias_value":"HIFRCMPB445PYX62","created_at":"2026-05-18T12:25:52Z"},{"alias_kind":"pith_short_8","alias_value":"HIFRCMPB","created_at":"2026-05-18T12:25:52Z"}],"graph_snapshots":[{"event_id":"sha256:aa2695680d1bef5b4fa14d9cfbd1e00e7f0365bfa15a0c594acd84a86abafed0","target":"graph","created_at":"2026-05-18T01:05:03Z","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":"Universal quantum computation requiring only the Heisenberg exchange interaction and suppressing decoherence via an energy gap is presented. The combination of an always-on exchange interaction between the three physical qubits comprising the encoded qubit and a global magnetic field generates an energy gap between the subspace of interest and all other states. This energy gap suppresses decoherence. Always-on exchange couplings greatly simplify hardware specifications and the implementation of inter-logical-qubit gates. A controlled phase gate can be implemented using only three Heisenberg ex","authors_text":"C. Stephen Hellberg, Yaakov S. Weinstein","cross_cats":[],"headline":"","license":"","primary_cat":"quant-ph","submitted_at":"2004-08-05T13:41:25Z","title":"Energetic Suppression of Decoherence in Exchange-Only Quantum Computation"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"quant-ph/0408037","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:b50056da7c7d46d03b141c35545003a7377656d32009c519d3251fb7542d83c0","target":"record","created_at":"2026-05-18T01:05:03Z","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":"07cdeb5c4cec727d15ff545bf52bc45d318d7206702582c03a2a14181ecf5818","cross_cats_sorted":[],"license":"","primary_cat":"quant-ph","submitted_at":"2004-08-05T13:41:25Z","title_canon_sha256":"2fc32128ecba955dcfe00a9b843f97195befc1be677b26f2ef54e6243ea4d15a"},"schema_version":"1.0","source":{"id":"quant-ph/0408037","kind":"arxiv","version":1}},"canonical_sha256":"3a0b1131e1e73afc5fda4708898c9d813cc74bd0fcef61f8fffebc1cff82ecec","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"3a0b1131e1e73afc5fda4708898c9d813cc74bd0fcef61f8fffebc1cff82ecec","first_computed_at":"2026-05-18T01:05:03.323499Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:05:03.323499Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"/oOiCvqUeO/lxvXoztzEcmX9bjHwZ5tNm0PAfPYz0YRmGaeHOb0WNkpI/UOcyIaK+9va1DezR+qPNQ0zsHMpCw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:05:03.324125Z","signed_message":"canonical_sha256_bytes"},"source_id":"quant-ph/0408037","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b50056da7c7d46d03b141c35545003a7377656d32009c519d3251fb7542d83c0","sha256:aa2695680d1bef5b4fa14d9cfbd1e00e7f0365bfa15a0c594acd84a86abafed0"],"state_sha256":"7d27f3d3166852e19d219e64e5114c4cf20f84ead0984b71b867ab93b1bde0f8"}