{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2025:KS6IYSGIPDKP5HJUXRFBX2EM57","short_pith_number":"pith:KS6IYSGI","canonical_record":{"source":{"id":"2504.03149","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2025-04-04T04:04:01Z","cross_cats_sorted":[],"title_canon_sha256":"6f1729671bc733f19c174f9bf442c5ede8352ef229ed691c5e4510efca6e4ee6","abstract_canon_sha256":"f89487b7d3d859b3441b6ad0d1664cad23b2302e3a64334a7867e1bbbb979f89"},"schema_version":"1.0"},"canonical_sha256":"54bc8c48c878d4fe9d34bc4a1be88cefdf2a99f23d473e17a03871e7aa7c1721","source":{"kind":"arxiv","id":"2504.03149","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2504.03149","created_at":"2026-07-05T10:44:27Z"},{"alias_kind":"arxiv_version","alias_value":"2504.03149v1","created_at":"2026-07-05T10:44:27Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2504.03149","created_at":"2026-07-05T10:44:27Z"},{"alias_kind":"pith_short_12","alias_value":"KS6IYSGIPDKP","created_at":"2026-07-05T10:44:27Z"},{"alias_kind":"pith_short_16","alias_value":"KS6IYSGIPDKP5HJU","created_at":"2026-07-05T10:44:27Z"},{"alias_kind":"pith_short_8","alias_value":"KS6IYSGI","created_at":"2026-07-05T10:44:27Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2025:KS6IYSGIPDKP5HJUXRFBX2EM57","target":"record","payload":{"canonical_record":{"source":{"id":"2504.03149","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2025-04-04T04:04:01Z","cross_cats_sorted":[],"title_canon_sha256":"6f1729671bc733f19c174f9bf442c5ede8352ef229ed691c5e4510efca6e4ee6","abstract_canon_sha256":"f89487b7d3d859b3441b6ad0d1664cad23b2302e3a64334a7867e1bbbb979f89"},"schema_version":"1.0"},"canonical_sha256":"54bc8c48c878d4fe9d34bc4a1be88cefdf2a99f23d473e17a03871e7aa7c1721","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T10:44:27.266520Z","signature_b64":"w6Q3kAiu5VQ41lMeUOn3h9ZYdZ7DX6BmdnyX2IuTG1TDWF4f1OJfa9/slpZZXIgabOcHRQ4Wem4K2A2AOAL9BA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"54bc8c48c878d4fe9d34bc4a1be88cefdf2a99f23d473e17a03871e7aa7c1721","last_reissued_at":"2026-07-05T10:44:27.265995Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T10:44:27.265995Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2504.03149","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T10:44:27Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"TS2Cw5jOdt/+scvJltFtT2PPoWBR0Wr+kvRiYZErPuXYQnSmr+A8MziO65Nm/bNqsXtcmzSssbqrzCbY/TT9Bg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-04T15:04:29.289793Z"},"content_sha256":"8cf697c546bbf8795a6c46e3e77675e43f55ba996c0533c51cbc1d22a48b6a5d","schema_version":"1.0","event_id":"sha256:8cf697c546bbf8795a6c46e3e77675e43f55ba996c0533c51cbc1d22a48b6a5d"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2025:KS6IYSGIPDKP5HJUXRFBX2EM57","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"SpinHex: A low-crosstalk, spin-qubit architecture based on multi-electron couplers","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Charles Smith, Frederico Martins, Josu Etxezarreta Martinez, Normann Mertig, Paul Schnabl, Rub\\'en M. Otxoa","submitted_at":"2025-04-04T04:04:01Z","abstract_excerpt":"Semiconductor spin qubits are an attractive quantum computing platform that offers long qubit coherence times and compatibility with existing semiconductor fabrication technology for scale up. Here, we propose a spin-qubit architecture based on spinless multielectron quantum dots that act as low-crosstalk couplers between a two-dimensional arrangement of spin-qubits in a hexagonal lattice. The multielectron couplers are controlled by voltage signals, which mediate fast Heisenberg exchange and thus enable coherent multi-qubit operations. For the proposed architecture, we discuss the implementat"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2504.03149","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2504.03149/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-05T10:44:27Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"2c7jdLZplnsyVKrwajMpUCA2XZxPLPV5T20Y/sdGz/15Gk0FvyDBsHJTyimvHxQQ1x7lvHc9RBLeYjKnp1a3Cw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-04T15:04:29.290275Z"},"content_sha256":"4b2fe99f906a273795fe16aa40bff066131d389b4c4a390342081799d0d0b3fe","schema_version":"1.0","event_id":"sha256:4b2fe99f906a273795fe16aa40bff066131d389b4c4a390342081799d0d0b3fe"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/KS6IYSGIPDKP5HJUXRFBX2EM57/bundle.json","state_url":"https://pith.science/pith/KS6IYSGIPDKP5HJUXRFBX2EM57/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/KS6IYSGIPDKP5HJUXRFBX2EM57/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":"2026-08-04T15:04:29Z","links":{"resolver":"https://pith.science/pith/KS6IYSGIPDKP5HJUXRFBX2EM57","bundle":"https://pith.science/pith/KS6IYSGIPDKP5HJUXRFBX2EM57/bundle.json","state":"https://pith.science/pith/KS6IYSGIPDKP5HJUXRFBX2EM57/state.json","well_known_bundle":"https://pith.science/.well-known/pith/KS6IYSGIPDKP5HJUXRFBX2EM57/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:KS6IYSGIPDKP5HJUXRFBX2EM57","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":"f89487b7d3d859b3441b6ad0d1664cad23b2302e3a64334a7867e1bbbb979f89","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2025-04-04T04:04:01Z","title_canon_sha256":"6f1729671bc733f19c174f9bf442c5ede8352ef229ed691c5e4510efca6e4ee6"},"schema_version":"1.0","source":{"id":"2504.03149","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2504.03149","created_at":"2026-07-05T10:44:27Z"},{"alias_kind":"arxiv_version","alias_value":"2504.03149v1","created_at":"2026-07-05T10:44:27Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2504.03149","created_at":"2026-07-05T10:44:27Z"},{"alias_kind":"pith_short_12","alias_value":"KS6IYSGIPDKP","created_at":"2026-07-05T10:44:27Z"},{"alias_kind":"pith_short_16","alias_value":"KS6IYSGIPDKP5HJU","created_at":"2026-07-05T10:44:27Z"},{"alias_kind":"pith_short_8","alias_value":"KS6IYSGI","created_at":"2026-07-05T10:44:27Z"}],"graph_snapshots":[{"event_id":"sha256:4b2fe99f906a273795fe16aa40bff066131d389b4c4a390342081799d0d0b3fe","target":"graph","created_at":"2026-07-05T10:44:27Z","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/2504.03149/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Semiconductor spin qubits are an attractive quantum computing platform that offers long qubit coherence times and compatibility with existing semiconductor fabrication technology for scale up. Here, we propose a spin-qubit architecture based on spinless multielectron quantum dots that act as low-crosstalk couplers between a two-dimensional arrangement of spin-qubits in a hexagonal lattice. The multielectron couplers are controlled by voltage signals, which mediate fast Heisenberg exchange and thus enable coherent multi-qubit operations. For the proposed architecture, we discuss the implementat","authors_text":"Charles Smith, Frederico Martins, Josu Etxezarreta Martinez, Normann Mertig, Paul Schnabl, Rub\\'en M. Otxoa","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2025-04-04T04:04:01Z","title":"SpinHex: A low-crosstalk, spin-qubit architecture based on multi-electron couplers"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2504.03149","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":"sha256:8cf697c546bbf8795a6c46e3e77675e43f55ba996c0533c51cbc1d22a48b6a5d","target":"record","created_at":"2026-07-05T10:44:27Z","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":"f89487b7d3d859b3441b6ad0d1664cad23b2302e3a64334a7867e1bbbb979f89","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2025-04-04T04:04:01Z","title_canon_sha256":"6f1729671bc733f19c174f9bf442c5ede8352ef229ed691c5e4510efca6e4ee6"},"schema_version":"1.0","source":{"id":"2504.03149","kind":"arxiv","version":1}},"canonical_sha256":"54bc8c48c878d4fe9d34bc4a1be88cefdf2a99f23d473e17a03871e7aa7c1721","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"54bc8c48c878d4fe9d34bc4a1be88cefdf2a99f23d473e17a03871e7aa7c1721","first_computed_at":"2026-07-05T10:44:27.265995Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T10:44:27.265995Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"w6Q3kAiu5VQ41lMeUOn3h9ZYdZ7DX6BmdnyX2IuTG1TDWF4f1OJfa9/slpZZXIgabOcHRQ4Wem4K2A2AOAL9BA==","signature_status":"signed_v1","signed_at":"2026-07-05T10:44:27.266520Z","signed_message":"canonical_sha256_bytes"},"source_id":"2504.03149","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:8cf697c546bbf8795a6c46e3e77675e43f55ba996c0533c51cbc1d22a48b6a5d","sha256:4b2fe99f906a273795fe16aa40bff066131d389b4c4a390342081799d0d0b3fe"],"state_sha256":"3badbbdc6bf62e335e4e02bad708b1c2858437c6a9be2f4c132c6d54066d8800"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"E4KcEAsAo8NMMvmDHnTvfywz3mo+G1uHOnzzgJgD42mnjKJ4UbBTY1YL14YArIRdEMUByezQxcn2UDrk+kKvBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-04T15:04:29.294638Z","bundle_sha256":"fbb1a89f6eef66ca6d05a49b3a6e1060690a334d29802a34e1ef3f885c0e47de"}}