{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:CA6EM4544RUM7NKBQVYJQCAEGO","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":"b6ebc09d472569295e839b8aa9351bb274751e22b3cb88ea52655d9c60223b87","cross_cats_sorted":["cond-mat.mes-hall","physics.app-ph"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2025-02-26T07:29:59Z","title_canon_sha256":"7f2d4ff3846c34b45b337a2600de48d1d92157785778b1028b9440027d04ced7"},"schema_version":"1.0","source":{"id":"2502.18902","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2502.18902","created_at":"2026-05-26T02:03:48Z"},{"alias_kind":"arxiv_version","alias_value":"2502.18902v1","created_at":"2026-05-26T02:03:48Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2502.18902","created_at":"2026-05-26T02:03:48Z"},{"alias_kind":"pith_short_12","alias_value":"CA6EM4544RUM","created_at":"2026-05-26T02:03:48Z"},{"alias_kind":"pith_short_16","alias_value":"CA6EM4544RUM7NKB","created_at":"2026-05-26T02:03:48Z"},{"alias_kind":"pith_short_8","alias_value":"CA6EM454","created_at":"2026-05-26T02:03:48Z"}],"graph_snapshots":[{"event_id":"sha256:e4dd3d2f7bda216bf5b2c35fe0b0b6b0855d4bd994dd257a7713c8571f1eff63","target":"graph","created_at":"2026-05-26T02:03:48Z","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/2502.18902/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Quantum error correction codes with non-local connections such as quantum low-density parity-check (qLDPC) incur lower overhead and outperform surface codes on large-scale devices. These codes are not applicable on current superconducting devices with nearest-neighbor connections. To rectify the deficiency in connectivity of superconducting circuit system, we experimentally demonstrate a convenient on-chip coupler of centimeters long and propose an extra coupler layer to map the qubit array to a binary-tree connecting graph. This mapping layout reduces the average qubit entangling distance fro","authors_text":"Hai-Feng Yu, Haonan Xiong, Hongyi Zhang, Jiahui Wang, Jize Yang, Juan Song, Luming Duan, Yan Li, Yipu Song, Zenghui Bao, Zhen-Yu Mi","cross_cats":["cond-mat.mes-hall","physics.app-ph"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2025-02-26T07:29:59Z","title":"Scalable Low-overhead Superconducting Non-local Coupler with Exponentially Enhanced Connectivity"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2502.18902","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:e89d46ed9c215b6471a5ed0c08496698807e5603e205b5737a68c5c033f38f4c","target":"record","created_at":"2026-05-26T02:03:48Z","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":"b6ebc09d472569295e839b8aa9351bb274751e22b3cb88ea52655d9c60223b87","cross_cats_sorted":["cond-mat.mes-hall","physics.app-ph"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2025-02-26T07:29:59Z","title_canon_sha256":"7f2d4ff3846c34b45b337a2600de48d1d92157785778b1028b9440027d04ced7"},"schema_version":"1.0","source":{"id":"2502.18902","kind":"arxiv","version":1}},"canonical_sha256":"103c4673bce468cfb5418570980804339311df413294d0430fa44b40679f8b69","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"103c4673bce468cfb5418570980804339311df413294d0430fa44b40679f8b69","first_computed_at":"2026-05-26T02:03:48.867575Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-26T02:03:48.867575Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"HwuJY+qeB8D2mkHVp/b+sbXAzn0xPr5yrK7DQDXbYF3Oh61DSHSPPX77O3aQ+hLnZn3h2S2BMOfyXAsRdFn1Cg==","signature_status":"signed_v1","signed_at":"2026-05-26T02:03:48.868669Z","signed_message":"canonical_sha256_bytes"},"source_id":"2502.18902","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e89d46ed9c215b6471a5ed0c08496698807e5603e205b5737a68c5c033f38f4c","sha256:e4dd3d2f7bda216bf5b2c35fe0b0b6b0855d4bd994dd257a7713c8571f1eff63"],"state_sha256":"305bbeb2fb2dcfca839812b18c7bf9f1f72ccacbc023046cad966dfb586decb4"}