{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2025:QZWRAGET43LRVPVSLODXLE67PN","short_pith_number":"pith:QZWRAGET","canonical_record":{"source":{"id":"2508.10889","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2025-08-14T17:56:12Z","cross_cats_sorted":[],"title_canon_sha256":"5601c282d296636e3f4c9f4af229e5baab0ae497e70aa9fdcec5e30a35fdd631","abstract_canon_sha256":"c323beb55955a622d1cb98432b13d75276eec1b6c871d1c33a019da858607d0f"},"schema_version":"1.0"},"canonical_sha256":"866d101893e6d71abeb25b877593df7b7567d67b399fe5d001095537756a0052","source":{"kind":"arxiv","id":"2508.10889","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2508.10889","created_at":"2026-07-05T11:54:04Z"},{"alias_kind":"arxiv_version","alias_value":"2508.10889v1","created_at":"2026-07-05T11:54:04Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2508.10889","created_at":"2026-07-05T11:54:04Z"},{"alias_kind":"pith_short_12","alias_value":"QZWRAGET43LR","created_at":"2026-07-05T11:54:04Z"},{"alias_kind":"pith_short_16","alias_value":"QZWRAGET43LRVPVS","created_at":"2026-07-05T11:54:04Z"},{"alias_kind":"pith_short_8","alias_value":"QZWRAGET","created_at":"2026-07-05T11:54:04Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2025:QZWRAGET43LRVPVSLODXLE67PN","target":"record","payload":{"canonical_record":{"source":{"id":"2508.10889","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2025-08-14T17:56:12Z","cross_cats_sorted":[],"title_canon_sha256":"5601c282d296636e3f4c9f4af229e5baab0ae497e70aa9fdcec5e30a35fdd631","abstract_canon_sha256":"c323beb55955a622d1cb98432b13d75276eec1b6c871d1c33a019da858607d0f"},"schema_version":"1.0"},"canonical_sha256":"866d101893e6d71abeb25b877593df7b7567d67b399fe5d001095537756a0052","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T11:54:04.517085Z","signature_b64":"aG/E/kUSF6f4HgkqBw+Yy2r9qDE7pkTPgHvNEVoU+nXHfSu/AVoy5jE7p/mdqfbGSuGIbR1y8oDFg59DKhk7BA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"866d101893e6d71abeb25b877593df7b7567d67b399fe5d001095537756a0052","last_reissued_at":"2026-07-05T11:54:04.516556Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T11:54:04.516556Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2508.10889","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":"2026-07-05T11:54:04Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Q6PusBc3WZTnFN/1AeGHJp8BK68tHiKAXjNlCMVDEwq/4bzqHoevfclWMXdNOkKYr1zek0tFDSPBMnHWqSoGAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-05T17:42:54.660835Z"},"content_sha256":"559c2812b877d704800aafb0b9a47e799df1eea0d64ccbf4ed947669471ed493","schema_version":"1.0","event_id":"sha256:559c2812b877d704800aafb0b9a47e799df1eea0d64ccbf4ed947669471ed493"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2025:QZWRAGET43LRVPVSLODXLE67PN","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Discovery of Niobium Hydride Precipitates in Superconducting Qubits","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.supr-con","authors_text":"Akshay Murthy, Alexander Romanenko, Anna Grassellino, Arely Cano, Daniel Bafia, Jaeyel Lee, Juan Rubio-Zuazo, Matthew J Reagor, ZuHawn Sung","submitted_at":"2025-08-14T17:56:12Z","abstract_excerpt":"We report the evidence of the formation of niobium hydride phase within niobium films on silicon substrates in superconducting qubits fabricated at Rigetti Computing. For this study, we combined complementary techniques, including room-temperature and cryogenic atomic force microscopy (AFM), synchrotron Xray diffraction, and time of flight secondary ion mass spectroscopy (ToF-SIMS), to directly reveal the existence of niobium hydride precipitates in the Rigetti chip area. Upon cryogenic cooling, we observed variation in the size and morphology of the hydrides, ranging from small (5 nm) irregul"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2508.10889","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/2508.10889/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":"2026-07-05T11:54:04Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"hfYjt/U3Kiiny0QOAMQPm4gmEypbHgS3zyMupGqqBlXT+duBz7TS4z6Db2R4qb0ESRkFlyD57hWxlvKWQLeRBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-05T17:42:54.662012Z"},"content_sha256":"e3c3c58c7858ba1360f0e93532f5b4c7da296d469cf8b5b9df3109faeaa2fd55","schema_version":"1.0","event_id":"sha256:e3c3c58c7858ba1360f0e93532f5b4c7da296d469cf8b5b9df3109faeaa2fd55"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/QZWRAGET43LRVPVSLODXLE67PN/bundle.json","state_url":"https://pith.science/pith/QZWRAGET43LRVPVSLODXLE67PN/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/QZWRAGET43LRVPVSLODXLE67PN/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":"2026-08-05T17:42:54Z","links":{"resolver":"https://pith.science/pith/QZWRAGET43LRVPVSLODXLE67PN","bundle":"https://pith.science/pith/QZWRAGET43LRVPVSLODXLE67PN/bundle.json","state":"https://pith.science/pith/QZWRAGET43LRVPVSLODXLE67PN/state.json","well_known_bundle":"https://pith.science/.well-known/pith/QZWRAGET43LRVPVSLODXLE67PN/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:QZWRAGET43LRVPVSLODXLE67PN","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":"c323beb55955a622d1cb98432b13d75276eec1b6c871d1c33a019da858607d0f","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2025-08-14T17:56:12Z","title_canon_sha256":"5601c282d296636e3f4c9f4af229e5baab0ae497e70aa9fdcec5e30a35fdd631"},"schema_version":"1.0","source":{"id":"2508.10889","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2508.10889","created_at":"2026-07-05T11:54:04Z"},{"alias_kind":"arxiv_version","alias_value":"2508.10889v1","created_at":"2026-07-05T11:54:04Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2508.10889","created_at":"2026-07-05T11:54:04Z"},{"alias_kind":"pith_short_12","alias_value":"QZWRAGET43LR","created_at":"2026-07-05T11:54:04Z"},{"alias_kind":"pith_short_16","alias_value":"QZWRAGET43LRVPVS","created_at":"2026-07-05T11:54:04Z"},{"alias_kind":"pith_short_8","alias_value":"QZWRAGET","created_at":"2026-07-05T11:54:04Z"}],"graph_snapshots":[{"event_id":"sha256:e3c3c58c7858ba1360f0e93532f5b4c7da296d469cf8b5b9df3109faeaa2fd55","target":"graph","created_at":"2026-07-05T11:54:04Z","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/2508.10889/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We report the evidence of the formation of niobium hydride phase within niobium films on silicon substrates in superconducting qubits fabricated at Rigetti Computing. For this study, we combined complementary techniques, including room-temperature and cryogenic atomic force microscopy (AFM), synchrotron Xray diffraction, and time of flight secondary ion mass spectroscopy (ToF-SIMS), to directly reveal the existence of niobium hydride precipitates in the Rigetti chip area. Upon cryogenic cooling, we observed variation in the size and morphology of the hydrides, ranging from small (5 nm) irregul","authors_text":"Akshay Murthy, Alexander Romanenko, Anna Grassellino, Arely Cano, Daniel Bafia, Jaeyel Lee, Juan Rubio-Zuazo, Matthew J Reagor, ZuHawn Sung","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2025-08-14T17:56:12Z","title":"Discovery of Niobium Hydride Precipitates in Superconducting Qubits"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2508.10889","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":"sha256:559c2812b877d704800aafb0b9a47e799df1eea0d64ccbf4ed947669471ed493","target":"record","created_at":"2026-07-05T11:54:04Z","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":"c323beb55955a622d1cb98432b13d75276eec1b6c871d1c33a019da858607d0f","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2025-08-14T17:56:12Z","title_canon_sha256":"5601c282d296636e3f4c9f4af229e5baab0ae497e70aa9fdcec5e30a35fdd631"},"schema_version":"1.0","source":{"id":"2508.10889","kind":"arxiv","version":1}},"canonical_sha256":"866d101893e6d71abeb25b877593df7b7567d67b399fe5d001095537756a0052","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"866d101893e6d71abeb25b877593df7b7567d67b399fe5d001095537756a0052","first_computed_at":"2026-07-05T11:54:04.516556Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T11:54:04.516556Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"aG/E/kUSF6f4HgkqBw+Yy2r9qDE7pkTPgHvNEVoU+nXHfSu/AVoy5jE7p/mdqfbGSuGIbR1y8oDFg59DKhk7BA==","signature_status":"signed_v1","signed_at":"2026-07-05T11:54:04.517085Z","signed_message":"canonical_sha256_bytes"},"source_id":"2508.10889","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:559c2812b877d704800aafb0b9a47e799df1eea0d64ccbf4ed947669471ed493","sha256:e3c3c58c7858ba1360f0e93532f5b4c7da296d469cf8b5b9df3109faeaa2fd55"],"state_sha256":"34a7e3e72b18f123de020d66c33b0cb20f74666798968672d6ac4762e56e1276"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"1t+WvoPfyq5OdtL+LBiuKo6r98e/9vE4yrrui17xPuvG1crLin2KqvnUysrBrG8m7e3oxMDVVYwbl4qVqT0uDA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-05T17:42:54.668841Z","bundle_sha256":"b752c3299ed9303f875e61ed5204229ccf9d186f61f89bad8b163d9f4108b5cc"}}