{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2023:CUKLIUJ22DLBKPVFW35QSUN7NR","short_pith_number":"pith:CUKLIUJ2","canonical_record":{"source":{"id":"2309.12603","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2023-09-22T03:31:51Z","cross_cats_sorted":[],"title_canon_sha256":"c0d75d3e2cd3da6900f67a0d2bfd52424ac978da60794f6388a3eec87a0f94cc","abstract_canon_sha256":"8fa387232540cfee1cb65358f3c7f2db22a79de8add88eb03a303db7c7589173"},"schema_version":"1.0"},"canonical_sha256":"1514b4513ad0d6153ea5b6fb0951bf6c47c2db0f1596c4bcda010fddc5a57544","source":{"kind":"arxiv","id":"2309.12603","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2309.12603","created_at":"2026-07-05T06:54:23Z"},{"alias_kind":"arxiv_version","alias_value":"2309.12603v2","created_at":"2026-07-05T06:54:23Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2309.12603","created_at":"2026-07-05T06:54:23Z"},{"alias_kind":"pith_short_12","alias_value":"CUKLIUJ22DLB","created_at":"2026-07-05T06:54:23Z"},{"alias_kind":"pith_short_16","alias_value":"CUKLIUJ22DLBKPVF","created_at":"2026-07-05T06:54:23Z"},{"alias_kind":"pith_short_8","alias_value":"CUKLIUJ2","created_at":"2026-07-05T06:54:23Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2023:CUKLIUJ22DLBKPVFW35QSUN7NR","target":"record","payload":{"canonical_record":{"source":{"id":"2309.12603","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2023-09-22T03:31:51Z","cross_cats_sorted":[],"title_canon_sha256":"c0d75d3e2cd3da6900f67a0d2bfd52424ac978da60794f6388a3eec87a0f94cc","abstract_canon_sha256":"8fa387232540cfee1cb65358f3c7f2db22a79de8add88eb03a303db7c7589173"},"schema_version":"1.0"},"canonical_sha256":"1514b4513ad0d6153ea5b6fb0951bf6c47c2db0f1596c4bcda010fddc5a57544","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T06:54:23.510301Z","signature_b64":"jCr02vMo+/EJ7Q/ZrZLoJualS3hqn8qb9tOBR16XQXWJYF+EqMmVTVTfKGewYJLKTha4TAjn00lD1wIkfnUoCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"1514b4513ad0d6153ea5b6fb0951bf6c47c2db0f1596c4bcda010fddc5a57544","last_reissued_at":"2026-07-05T06:54:23.509855Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T06:54:23.509855Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2309.12603","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T06:54:23Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"M0aqgjtlJ8LaH5rkXoTlJghCgUBl+zLYDB4aeU6OekPmzkvQFmAsYx9wmdOUc0vq97ncDeGbzpLuxyopZiVLDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-20T12:35:33.474899Z"},"content_sha256":"f4bae465757f64388d6e75bfda09a096712dd6e75a9e2803eeb12cd7ca67911d","schema_version":"1.0","event_id":"sha256:f4bae465757f64388d6e75bfda09a096712dd6e75a9e2803eeb12cd7ca67911d"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2023:CUKLIUJ22DLBKPVFW35QSUN7NR","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Ultrathin Magnesium-based Coating as an Efficient Oxygen Barrier for Superconducting Circuit Materials","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Andrew L. Walter, Ashley R. Head, Aswin kumar Anbalagan, Chenyu Zhou, Conan Weiland, Gengnan Li, Junsik Mun, Juntao Yao, Kim Kisslinger, Mingzhao Liu, Mohammad D. Hossain, Peter V. Sushko, Qiang Li, Ruoshui Li, Russell A. McLellan, Steven L. Hulbert, Xiao Tong, Yimei Zhu","submitted_at":"2023-09-22T03:31:51Z","abstract_excerpt":"Scaling up superconducting quantum circuits based on transmon qubits necessitates substantial enhancements in qubit coherence time. Among the materials considered for transmon qubits, tantalum (Ta) has emerged as a promising candidate, surpassing conventional counterparts in terms of coherence time. However, the presence of an amorphous surface Ta oxide layer introduces dielectric loss, ultimately placing a limit on the coherence time. In this study, we present a novel approach for suppressing the formation of tantalum oxide using an ultrathin magnesium (Mg) capping layer deposited on top of t"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2309.12603","kind":"arxiv","version":2},"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/2309.12603/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":"2026-07-05T06:54:23Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"tuOKssUD50y5j9NwwFGBUZhOz/iWZKxSAB5WAANdBhJguvJ/RPQTWK64pgs6OlnQzFDbe9u52Eiw7n6STRPZAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-20T12:35:33.475427Z"},"content_sha256":"e43a48e92a8b82a5c700d6764f8943111794b5ea28b044498b5fa582d8923fe1","schema_version":"1.0","event_id":"sha256:e43a48e92a8b82a5c700d6764f8943111794b5ea28b044498b5fa582d8923fe1"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/CUKLIUJ22DLBKPVFW35QSUN7NR/bundle.json","state_url":"https://pith.science/pith/CUKLIUJ22DLBKPVFW35QSUN7NR/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/CUKLIUJ22DLBKPVFW35QSUN7NR/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":"2026-08-20T12:35:33Z","links":{"resolver":"https://pith.science/pith/CUKLIUJ22DLBKPVFW35QSUN7NR","bundle":"https://pith.science/pith/CUKLIUJ22DLBKPVFW35QSUN7NR/bundle.json","state":"https://pith.science/pith/CUKLIUJ22DLBKPVFW35QSUN7NR/state.json","well_known_bundle":"https://pith.science/.well-known/pith/CUKLIUJ22DLBKPVFW35QSUN7NR/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2023:CUKLIUJ22DLBKPVFW35QSUN7NR","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":"8fa387232540cfee1cb65358f3c7f2db22a79de8add88eb03a303db7c7589173","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2023-09-22T03:31:51Z","title_canon_sha256":"c0d75d3e2cd3da6900f67a0d2bfd52424ac978da60794f6388a3eec87a0f94cc"},"schema_version":"1.0","source":{"id":"2309.12603","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2309.12603","created_at":"2026-07-05T06:54:23Z"},{"alias_kind":"arxiv_version","alias_value":"2309.12603v2","created_at":"2026-07-05T06:54:23Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2309.12603","created_at":"2026-07-05T06:54:23Z"},{"alias_kind":"pith_short_12","alias_value":"CUKLIUJ22DLB","created_at":"2026-07-05T06:54:23Z"},{"alias_kind":"pith_short_16","alias_value":"CUKLIUJ22DLBKPVF","created_at":"2026-07-05T06:54:23Z"},{"alias_kind":"pith_short_8","alias_value":"CUKLIUJ2","created_at":"2026-07-05T06:54:23Z"}],"graph_snapshots":[{"event_id":"sha256:e43a48e92a8b82a5c700d6764f8943111794b5ea28b044498b5fa582d8923fe1","target":"graph","created_at":"2026-07-05T06:54:23Z","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/2309.12603/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Scaling up superconducting quantum circuits based on transmon qubits necessitates substantial enhancements in qubit coherence time. Among the materials considered for transmon qubits, tantalum (Ta) has emerged as a promising candidate, surpassing conventional counterparts in terms of coherence time. However, the presence of an amorphous surface Ta oxide layer introduces dielectric loss, ultimately placing a limit on the coherence time. In this study, we present a novel approach for suppressing the formation of tantalum oxide using an ultrathin magnesium (Mg) capping layer deposited on top of t","authors_text":"Andrew L. Walter, Ashley R. Head, Aswin kumar Anbalagan, Chenyu Zhou, Conan Weiland, Gengnan Li, Junsik Mun, Juntao Yao, Kim Kisslinger, Mingzhao Liu, Mohammad D. Hossain, Peter V. Sushko, Qiang Li, Ruoshui Li, Russell A. McLellan, Steven L. Hulbert, Xiao Tong, Yimei Zhu","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2023-09-22T03:31:51Z","title":"Ultrathin Magnesium-based Coating as an Efficient Oxygen Barrier for Superconducting Circuit Materials"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2309.12603","kind":"arxiv","version":2},"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:f4bae465757f64388d6e75bfda09a096712dd6e75a9e2803eeb12cd7ca67911d","target":"record","created_at":"2026-07-05T06:54:23Z","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":"8fa387232540cfee1cb65358f3c7f2db22a79de8add88eb03a303db7c7589173","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2023-09-22T03:31:51Z","title_canon_sha256":"c0d75d3e2cd3da6900f67a0d2bfd52424ac978da60794f6388a3eec87a0f94cc"},"schema_version":"1.0","source":{"id":"2309.12603","kind":"arxiv","version":2}},"canonical_sha256":"1514b4513ad0d6153ea5b6fb0951bf6c47c2db0f1596c4bcda010fddc5a57544","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"1514b4513ad0d6153ea5b6fb0951bf6c47c2db0f1596c4bcda010fddc5a57544","first_computed_at":"2026-07-05T06:54:23.509855Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T06:54:23.509855Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"jCr02vMo+/EJ7Q/ZrZLoJualS3hqn8qb9tOBR16XQXWJYF+EqMmVTVTfKGewYJLKTha4TAjn00lD1wIkfnUoCg==","signature_status":"signed_v1","signed_at":"2026-07-05T06:54:23.510301Z","signed_message":"canonical_sha256_bytes"},"source_id":"2309.12603","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:f4bae465757f64388d6e75bfda09a096712dd6e75a9e2803eeb12cd7ca67911d","sha256:e43a48e92a8b82a5c700d6764f8943111794b5ea28b044498b5fa582d8923fe1"],"state_sha256":"170885e8972685a4c4abf7a33caac01b13571a6b5270e5fb73f1d34cb9cc9f92"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"GDgDBnWy+rQOtJJGEA4lahV6vwg6/mvvvnWxAWCOWkC7fTwkrt3x8yAXAHFF3s8O5qLDU9tUKTrA6QMdaxn5AQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-20T12:35:33.481140Z","bundle_sha256":"be72a0989dcfe813236c125d2de3be48809034ceff11470eec905df6f8b62a97"}}