{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2026:3L5B5OMQ5TUZVJMA2GPTISTNO6","short_pith_number":"pith:3L5B5OMQ","canonical_record":{"source":{"id":"2605.20781","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2026-05-20T06:22:44Z","cross_cats_sorted":["cond-mat.mes-hall"],"title_canon_sha256":"9c3d990413efeefc1ae7e4ab7889b6003861dda85669201b15214c8c5fe8bb19","abstract_canon_sha256":"91c81ea2d332797ea1a1e2bbf7a4e24b1442b9e410cd14b78e44fe799bebbd70"},"schema_version":"1.0"},"canonical_sha256":"dafa1eb990ece99aa580d19f344a6d779626e260a7326e1cb58f378cbfe94668","source":{"kind":"arxiv","id":"2605.20781","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2605.20781","created_at":"2026-05-21T01:04:54Z"},{"alias_kind":"arxiv_version","alias_value":"2605.20781v1","created_at":"2026-05-21T01:04:54Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2605.20781","created_at":"2026-05-21T01:04:54Z"},{"alias_kind":"pith_short_12","alias_value":"3L5B5OMQ5TUZ","created_at":"2026-05-21T01:04:54Z"},{"alias_kind":"pith_short_16","alias_value":"3L5B5OMQ5TUZVJMA","created_at":"2026-05-21T01:04:54Z"},{"alias_kind":"pith_short_8","alias_value":"3L5B5OMQ","created_at":"2026-05-21T01:04:54Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2026:3L5B5OMQ5TUZVJMA2GPTISTNO6","target":"record","payload":{"canonical_record":{"source":{"id":"2605.20781","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2026-05-20T06:22:44Z","cross_cats_sorted":["cond-mat.mes-hall"],"title_canon_sha256":"9c3d990413efeefc1ae7e4ab7889b6003861dda85669201b15214c8c5fe8bb19","abstract_canon_sha256":"91c81ea2d332797ea1a1e2bbf7a4e24b1442b9e410cd14b78e44fe799bebbd70"},"schema_version":"1.0"},"canonical_sha256":"dafa1eb990ece99aa580d19f344a6d779626e260a7326e1cb58f378cbfe94668","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-21T01:04:54.027452Z","signature_b64":"l+fpvz0uUThKU8fgtcgyXryfA8GiHGaO1skoYbYTNATcT771jlGzbpQARsQo91CpC4pplJtZUlOUGdtre3PCAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"dafa1eb990ece99aa580d19f344a6d779626e260a7326e1cb58f378cbfe94668","last_reissued_at":"2026-05-21T01:04:54.026664Z","signature_status":"signed_v1","first_computed_at":"2026-05-21T01:04:54.026664Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2605.20781","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":"2026-05-21T01:04:54Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"iMdylqIEenFSJ1u7kG6tVrhth9FdXEr+Rszy9/zFDFMCDRs36vuQHSaheKKWI2tejWhjhgsJIzzf2mHNE/J2BA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T15:07:58.758891Z"},"content_sha256":"ae09e5bde4114f8c4348a1aa88804ae550f75370b29a726f78894ff1f3b2a023","schema_version":"1.0","event_id":"sha256:ae09e5bde4114f8c4348a1aa88804ae550f75370b29a726f78894ff1f3b2a023"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2026:3L5B5OMQ5TUZVJMA2GPTISTNO6","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Multi-Qubit Entanglement of Unit Cell Pairs in SiMOS","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.mes-hall"],"primary_cat":"quant-ph","authors_text":"Andre Saraiva, Andrew S. Dzurak, Arne Laucht, Cameron Jones, Chih Hwan Yang, Fay E. Hudson, Gerardo A. Paz-Silva, Hans-Joachim Pohl, Jonathan Y. Huang, MengKe Feng, Michael L. W. Thewalt, Nikolay V. Abrosimov, Paul Steinacker, Santiago Serrano, Tuomo Tanttu, Wee Han Lim","submitted_at":"2026-05-20T06:22:44Z","abstract_excerpt":"Spin qubits in silicon-MOS (SiMOS) quantum dots have recently demonstrated compatibility with existing industry standard CMOS fabrication techniques. These devices have routinely achieved single- and two-qubit gate fidelities above 99% and demonstrated highly entangled two-qubit Bell states in isolated double quantum dot (DQD) unit cells, however coupling between unit cells has remained challenging. In this work, we present a two unit cell, four-qubit SiMOS processor with universal controllability and fully parallelised state initialisation and readout. We use this processor to generate maxima"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2605.20781","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/2605.20781/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":"2026-05-21T01:04:54Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"1IaVuZsHqMKMMjv5GPxNecTJ51OjndqK4AOvN+NEqHpQFM+Gu4+xpaZxQXLff80jAd7XuUXMb6Fi6lnhuLXdCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T15:07:58.759663Z"},"content_sha256":"491a012c466fdf851cbb5042d7cfdb6303c87e565e830863d9c6a8dad9d000c3","schema_version":"1.0","event_id":"sha256:491a012c466fdf851cbb5042d7cfdb6303c87e565e830863d9c6a8dad9d000c3"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/3L5B5OMQ5TUZVJMA2GPTISTNO6/bundle.json","state_url":"https://pith.science/pith/3L5B5OMQ5TUZVJMA2GPTISTNO6/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/3L5B5OMQ5TUZVJMA2GPTISTNO6/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":"2026-05-28T15:07:58Z","links":{"resolver":"https://pith.science/pith/3L5B5OMQ5TUZVJMA2GPTISTNO6","bundle":"https://pith.science/pith/3L5B5OMQ5TUZVJMA2GPTISTNO6/bundle.json","state":"https://pith.science/pith/3L5B5OMQ5TUZVJMA2GPTISTNO6/state.json","well_known_bundle":"https://pith.science/.well-known/pith/3L5B5OMQ5TUZVJMA2GPTISTNO6/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:3L5B5OMQ5TUZVJMA2GPTISTNO6","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":"91c81ea2d332797ea1a1e2bbf7a4e24b1442b9e410cd14b78e44fe799bebbd70","cross_cats_sorted":["cond-mat.mes-hall"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2026-05-20T06:22:44Z","title_canon_sha256":"9c3d990413efeefc1ae7e4ab7889b6003861dda85669201b15214c8c5fe8bb19"},"schema_version":"1.0","source":{"id":"2605.20781","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2605.20781","created_at":"2026-05-21T01:04:54Z"},{"alias_kind":"arxiv_version","alias_value":"2605.20781v1","created_at":"2026-05-21T01:04:54Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2605.20781","created_at":"2026-05-21T01:04:54Z"},{"alias_kind":"pith_short_12","alias_value":"3L5B5OMQ5TUZ","created_at":"2026-05-21T01:04:54Z"},{"alias_kind":"pith_short_16","alias_value":"3L5B5OMQ5TUZVJMA","created_at":"2026-05-21T01:04:54Z"},{"alias_kind":"pith_short_8","alias_value":"3L5B5OMQ","created_at":"2026-05-21T01:04:54Z"}],"graph_snapshots":[{"event_id":"sha256:491a012c466fdf851cbb5042d7cfdb6303c87e565e830863d9c6a8dad9d000c3","target":"graph","created_at":"2026-05-21T01:04:54Z","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/2605.20781/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Spin qubits in silicon-MOS (SiMOS) quantum dots have recently demonstrated compatibility with existing industry standard CMOS fabrication techniques. These devices have routinely achieved single- and two-qubit gate fidelities above 99% and demonstrated highly entangled two-qubit Bell states in isolated double quantum dot (DQD) unit cells, however coupling between unit cells has remained challenging. In this work, we present a two unit cell, four-qubit SiMOS processor with universal controllability and fully parallelised state initialisation and readout. We use this processor to generate maxima","authors_text":"Andre Saraiva, Andrew S. Dzurak, Arne Laucht, Cameron Jones, Chih Hwan Yang, Fay E. Hudson, Gerardo A. Paz-Silva, Hans-Joachim Pohl, Jonathan Y. Huang, MengKe Feng, Michael L. W. Thewalt, Nikolay V. Abrosimov, Paul Steinacker, Santiago Serrano, Tuomo Tanttu, Wee Han Lim","cross_cats":["cond-mat.mes-hall"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2026-05-20T06:22:44Z","title":"Multi-Qubit Entanglement of Unit Cell Pairs in SiMOS"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2605.20781","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:ae09e5bde4114f8c4348a1aa88804ae550f75370b29a726f78894ff1f3b2a023","target":"record","created_at":"2026-05-21T01:04:54Z","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":"91c81ea2d332797ea1a1e2bbf7a4e24b1442b9e410cd14b78e44fe799bebbd70","cross_cats_sorted":["cond-mat.mes-hall"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2026-05-20T06:22:44Z","title_canon_sha256":"9c3d990413efeefc1ae7e4ab7889b6003861dda85669201b15214c8c5fe8bb19"},"schema_version":"1.0","source":{"id":"2605.20781","kind":"arxiv","version":1}},"canonical_sha256":"dafa1eb990ece99aa580d19f344a6d779626e260a7326e1cb58f378cbfe94668","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"dafa1eb990ece99aa580d19f344a6d779626e260a7326e1cb58f378cbfe94668","first_computed_at":"2026-05-21T01:04:54.026664Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-21T01:04:54.026664Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"l+fpvz0uUThKU8fgtcgyXryfA8GiHGaO1skoYbYTNATcT771jlGzbpQARsQo91CpC4pplJtZUlOUGdtre3PCAg==","signature_status":"signed_v1","signed_at":"2026-05-21T01:04:54.027452Z","signed_message":"canonical_sha256_bytes"},"source_id":"2605.20781","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:ae09e5bde4114f8c4348a1aa88804ae550f75370b29a726f78894ff1f3b2a023","sha256:491a012c466fdf851cbb5042d7cfdb6303c87e565e830863d9c6a8dad9d000c3"],"state_sha256":"b8c509f7dc3b722dbda475a08b01e8bc31e012795d11bb719722032d9d0b2077"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"GEhbhPgCLM+3v8iiSjcn0XAK74zpwlOD9Y5cN2KW+Z+Rh1OHtni3nGBt0kutIYXWdTHj0dopV4zt/poQomdkCA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-28T15:07:58.763515Z","bundle_sha256":"7388f67bf065962198e32b8ab4e5a82895b185480cbeaf2da519171273460bf9"}}