{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2026:ZZUREG4NEXL72QZX4L355FXQSW","short_pith_number":"pith:ZZUREG4N","canonical_record":{"source":{"id":"2605.30455","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2026-05-28T18:27:34Z","cross_cats_sorted":[],"title_canon_sha256":"605ba1392d82a6b8218628a592d29b83dfb9b00cf69ec8e2911c9341b9e39930","abstract_canon_sha256":"0756f11fbfd287c72a5b7185f2eead7099e0784a82f8f45e68cdd9ab5d3a5e6f"},"schema_version":"1.0"},"canonical_sha256":"ce69121b8d25d7fd4337e2f7de96f095aef17d7a38e676d4b48e856ade0be686","source":{"kind":"arxiv","id":"2605.30455","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2605.30455","created_at":"2026-06-01T01:02:55Z"},{"alias_kind":"arxiv_version","alias_value":"2605.30455v1","created_at":"2026-06-01T01:02:55Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2605.30455","created_at":"2026-06-01T01:02:55Z"},{"alias_kind":"pith_short_12","alias_value":"ZZUREG4NEXL7","created_at":"2026-06-01T01:02:55Z"},{"alias_kind":"pith_short_16","alias_value":"ZZUREG4NEXL72QZX","created_at":"2026-06-01T01:02:55Z"},{"alias_kind":"pith_short_8","alias_value":"ZZUREG4N","created_at":"2026-06-01T01:02:55Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2026:ZZUREG4NEXL72QZX4L355FXQSW","target":"record","payload":{"canonical_record":{"source":{"id":"2605.30455","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2026-05-28T18:27:34Z","cross_cats_sorted":[],"title_canon_sha256":"605ba1392d82a6b8218628a592d29b83dfb9b00cf69ec8e2911c9341b9e39930","abstract_canon_sha256":"0756f11fbfd287c72a5b7185f2eead7099e0784a82f8f45e68cdd9ab5d3a5e6f"},"schema_version":"1.0"},"canonical_sha256":"ce69121b8d25d7fd4337e2f7de96f095aef17d7a38e676d4b48e856ade0be686","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-06-01T01:02:55.260940Z","signature_b64":"ETwaY+E3lhT0ePY3Z5QWkltlE/M81pm8L6POGBl5EyeSiRFs8XUjbOfcN0XZxroBnW2sab9NhTMZyzVM1seUAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ce69121b8d25d7fd4337e2f7de96f095aef17d7a38e676d4b48e856ade0be686","last_reissued_at":"2026-06-01T01:02:55.260153Z","signature_status":"signed_v1","first_computed_at":"2026-06-01T01:02:55.260153Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2605.30455","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":"2026-06-01T01:02:55Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"bKhFDsbUENaxB1fm2E0rb5g5JrKfXrD+yl31UKe46o624X0k44c1YGLAxeBAhVaxc7ruaoaq2HzACtzVzqPbAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-04T01:38:49.872810Z"},"content_sha256":"d1d31be95d6daedd4d2d12770ea7bc6e4780c7849bb216389087c17fc4faaf91","schema_version":"1.0","event_id":"sha256:d1d31be95d6daedd4d2d12770ea7bc6e4780c7849bb216389087c17fc4faaf91"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2026:ZZUREG4NEXL72QZX4L355FXQSW","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A Denser Planar Surface Code","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Alec F. White, Dominic W. Berry, Guang Hao Low, Nicholas C. Rubin, Ryan Babbush, Tanuj Khattar, William J. Huggins","submitted_at":"2026-05-28T18:27:34Z","abstract_excerpt":"We present a quantum code implementable on a regular $2$D hex grid with an estimated encoding rate up to $4.5\\times$ of that of a rotated surface code patch using circuit-level noise in a one- and two-qubit $10^{-3}$ error uniform depolarizing model. Our approach is based on yoking a dense packing of surface code twist defects, enabled by new stabilizer measurement cycles with an optimal four layers of nearest-neighbor two-qubit gates, almost no distance-reducing hook errors, and efficient decoding. We demonstrate a space-efficient architecture for computing on densely packed logical qubits, i"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2605.30455","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/2605.30455/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":"2026-06-01T01:02:55Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"u+gQGOqa+6mktIja3LNps8/sU/yUz1qSySCkCI2Iz/86vnCfo/5MsoKmLZ+0BL+abMi1AMLJrmJcaHDV1VC9Ag==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-04T01:38:49.873195Z"},"content_sha256":"a7dd656e761e7bb4a4408cfdc74e10da08a7a582d5073cb7315b1337b7348c2e","schema_version":"1.0","event_id":"sha256:a7dd656e761e7bb4a4408cfdc74e10da08a7a582d5073cb7315b1337b7348c2e"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/ZZUREG4NEXL72QZX4L355FXQSW/bundle.json","state_url":"https://pith.science/pith/ZZUREG4NEXL72QZX4L355FXQSW/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/ZZUREG4NEXL72QZX4L355FXQSW/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":"2026-06-04T01:38:49Z","links":{"resolver":"https://pith.science/pith/ZZUREG4NEXL72QZX4L355FXQSW","bundle":"https://pith.science/pith/ZZUREG4NEXL72QZX4L355FXQSW/bundle.json","state":"https://pith.science/pith/ZZUREG4NEXL72QZX4L355FXQSW/state.json","well_known_bundle":"https://pith.science/.well-known/pith/ZZUREG4NEXL72QZX4L355FXQSW/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:ZZUREG4NEXL72QZX4L355FXQSW","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":"0756f11fbfd287c72a5b7185f2eead7099e0784a82f8f45e68cdd9ab5d3a5e6f","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2026-05-28T18:27:34Z","title_canon_sha256":"605ba1392d82a6b8218628a592d29b83dfb9b00cf69ec8e2911c9341b9e39930"},"schema_version":"1.0","source":{"id":"2605.30455","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2605.30455","created_at":"2026-06-01T01:02:55Z"},{"alias_kind":"arxiv_version","alias_value":"2605.30455v1","created_at":"2026-06-01T01:02:55Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2605.30455","created_at":"2026-06-01T01:02:55Z"},{"alias_kind":"pith_short_12","alias_value":"ZZUREG4NEXL7","created_at":"2026-06-01T01:02:55Z"},{"alias_kind":"pith_short_16","alias_value":"ZZUREG4NEXL72QZX","created_at":"2026-06-01T01:02:55Z"},{"alias_kind":"pith_short_8","alias_value":"ZZUREG4N","created_at":"2026-06-01T01:02:55Z"}],"graph_snapshots":[{"event_id":"sha256:a7dd656e761e7bb4a4408cfdc74e10da08a7a582d5073cb7315b1337b7348c2e","target":"graph","created_at":"2026-06-01T01:02:55Z","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/2605.30455/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We present a quantum code implementable on a regular $2$D hex grid with an estimated encoding rate up to $4.5\\times$ of that of a rotated surface code patch using circuit-level noise in a one- and two-qubit $10^{-3}$ error uniform depolarizing model. Our approach is based on yoking a dense packing of surface code twist defects, enabled by new stabilizer measurement cycles with an optimal four layers of nearest-neighbor two-qubit gates, almost no distance-reducing hook errors, and efficient decoding. We demonstrate a space-efficient architecture for computing on densely packed logical qubits, i","authors_text":"Alec F. White, Dominic W. Berry, Guang Hao Low, Nicholas C. Rubin, Ryan Babbush, Tanuj Khattar, William J. Huggins","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2026-05-28T18:27:34Z","title":"A Denser Planar Surface Code"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2605.30455","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:d1d31be95d6daedd4d2d12770ea7bc6e4780c7849bb216389087c17fc4faaf91","target":"record","created_at":"2026-06-01T01:02:55Z","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":"0756f11fbfd287c72a5b7185f2eead7099e0784a82f8f45e68cdd9ab5d3a5e6f","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2026-05-28T18:27:34Z","title_canon_sha256":"605ba1392d82a6b8218628a592d29b83dfb9b00cf69ec8e2911c9341b9e39930"},"schema_version":"1.0","source":{"id":"2605.30455","kind":"arxiv","version":1}},"canonical_sha256":"ce69121b8d25d7fd4337e2f7de96f095aef17d7a38e676d4b48e856ade0be686","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ce69121b8d25d7fd4337e2f7de96f095aef17d7a38e676d4b48e856ade0be686","first_computed_at":"2026-06-01T01:02:55.260153Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-06-01T01:02:55.260153Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"ETwaY+E3lhT0ePY3Z5QWkltlE/M81pm8L6POGBl5EyeSiRFs8XUjbOfcN0XZxroBnW2sab9NhTMZyzVM1seUAA==","signature_status":"signed_v1","signed_at":"2026-06-01T01:02:55.260940Z","signed_message":"canonical_sha256_bytes"},"source_id":"2605.30455","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:d1d31be95d6daedd4d2d12770ea7bc6e4780c7849bb216389087c17fc4faaf91","sha256:a7dd656e761e7bb4a4408cfdc74e10da08a7a582d5073cb7315b1337b7348c2e"],"state_sha256":"9a4dd355967b3250a4cdcb979bb1f8e34335137e92d5a3512fbd54b596056791"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"AA9cz+FBeJJnUTyRXvhIl9cw7KMro7kvx9y9VShZ69SI6IGjDClPL47bHzQwdTBgaAtZpkYht7iXhrmSLbl/Dg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-04T01:38:49.875223Z","bundle_sha256":"2b78816e11bb03b6b6569e31e3f16560f26b651d1a09684e8d8b628cf14457e5"}}