{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2026:SBC24GB34NMEIC7K2P2W4CLI43","short_pith_number":"pith:SBC24GB3","canonical_record":{"source":{"id":"2608.01478","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2026-08-02T20:18:14Z","cross_cats_sorted":["cond-mat.mtrl-sci"],"title_canon_sha256":"a0e0879d08e63decbf363766eb56abc3618cdf2a76ea171d68541e2bfbc19dbc","abstract_canon_sha256":"20338867af9b706827ca451473cf2d7f70fe132fb02fbf313efb793071bdcb96"},"schema_version":"1.0"},"canonical_sha256":"9045ae183be358440bead3f56e0968e6c8e52b6b8dc61804bd52598f272795fc","source":{"kind":"arxiv","id":"2608.01478","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2608.01478","created_at":"2026-08-04T02:05:29Z"},{"alias_kind":"arxiv_version","alias_value":"2608.01478v1","created_at":"2026-08-04T02:05:29Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2608.01478","created_at":"2026-08-04T02:05:29Z"},{"alias_kind":"pith_short_12","alias_value":"SBC24GB34NME","created_at":"2026-08-04T02:05:29Z"},{"alias_kind":"pith_short_16","alias_value":"SBC24GB34NMEIC7K","created_at":"2026-08-04T02:05:29Z"},{"alias_kind":"pith_short_8","alias_value":"SBC24GB3","created_at":"2026-08-04T02:05:29Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2026:SBC24GB34NMEIC7K2P2W4CLI43","target":"record","payload":{"canonical_record":{"source":{"id":"2608.01478","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2026-08-02T20:18:14Z","cross_cats_sorted":["cond-mat.mtrl-sci"],"title_canon_sha256":"a0e0879d08e63decbf363766eb56abc3618cdf2a76ea171d68541e2bfbc19dbc","abstract_canon_sha256":"20338867af9b706827ca451473cf2d7f70fe132fb02fbf313efb793071bdcb96"},"schema_version":"1.0"},"canonical_sha256":"9045ae183be358440bead3f56e0968e6c8e52b6b8dc61804bd52598f272795fc","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-08-04T02:05:29.719649Z","signature_b64":"ZFlnlaZqE3ILEI2NfGZ+h8p1ilcqs4H7bW3nq819y9kUuf2S61/VLv6+aM9sOrmV1N8pcexqygS9S7+DHZeaAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"9045ae183be358440bead3f56e0968e6c8e52b6b8dc61804bd52598f272795fc","last_reissued_at":"2026-08-04T02:05:29.717886Z","signature_status":"signed_v1","first_computed_at":"2026-08-04T02:05:29.717886Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2608.01478","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":"2026-08-04T02:05:29Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"nBOYS8VJ+ySny3gfzeS5r0EkQLHea5DZB1tt7RQWrsQv83/yResXC0ZRzbz/LQar08tM6q/hSKH8uvZMKlfhBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-13T20:39:40.438575Z"},"content_sha256":"35e4687b804229f4d38702409e3bafbe99f07bed46e2a2439155093f22b8c07f","schema_version":"1.0","event_id":"sha256:35e4687b804229f4d38702409e3bafbe99f07bed46e2a2439155093f22b8c07f"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2026:SBC24GB34NMEIC7K2P2W4CLI43","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Surface adsorbates suppress low-frequency noise for shallow nitrogen-vacancy centers","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.mtrl-sci"],"primary_cat":"quant-ph","authors_text":"David A. Fehr, Kalliope Zervas, Lila V. H. Rodgers, Michael E. Flatte, Nathalie P. de Leon, Patryk Gumann, Sorawis Sangtawesin, Zhiyang Yuan","submitted_at":"2026-08-02T20:18:14Z","abstract_excerpt":"Shallow nitrogen-vacancy (NV) centers in diamond are promising nanoscale quantum sensors, yet their coherence is strongly limited by surface-induced noise. Surface adsorbates are widely believed to be a major source of decoherence. Here, we test this assumption by characterizing shallow single NV centers under ultrahigh vacuum (UHV) conditions, where the diamond surface is kept free of adsorbates, and comparing their behavior to ambient conditions. Surprisingly, we observe a ~4x reduction in the Hahn echo coherence time T2 in UHV. By combining Hahn echo measurements in the single-quantum (SQ) "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2608.01478","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/2608.01478/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":"2026-08-04T02:05:29Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"kZgRTc016F6bLGGRmSuisOj9kVgliWLL6gBc1ayL55qwqeOJihGiIJ2mKf6KEPPNHRFIUztJUCYuPi4d5SbhAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-13T20:39:40.439560Z"},"content_sha256":"ee410917b34f418c9c9bda3ac869af48929d44b0207ee01190b2664da4b10be9","schema_version":"1.0","event_id":"sha256:ee410917b34f418c9c9bda3ac869af48929d44b0207ee01190b2664da4b10be9"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/SBC24GB34NMEIC7K2P2W4CLI43/bundle.json","state_url":"https://pith.science/pith/SBC24GB34NMEIC7K2P2W4CLI43/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/SBC24GB34NMEIC7K2P2W4CLI43/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":"2026-08-13T20:39:40Z","links":{"resolver":"https://pith.science/pith/SBC24GB34NMEIC7K2P2W4CLI43","bundle":"https://pith.science/pith/SBC24GB34NMEIC7K2P2W4CLI43/bundle.json","state":"https://pith.science/pith/SBC24GB34NMEIC7K2P2W4CLI43/state.json","well_known_bundle":"https://pith.science/.well-known/pith/SBC24GB34NMEIC7K2P2W4CLI43/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:SBC24GB34NMEIC7K2P2W4CLI43","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":"20338867af9b706827ca451473cf2d7f70fe132fb02fbf313efb793071bdcb96","cross_cats_sorted":["cond-mat.mtrl-sci"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2026-08-02T20:18:14Z","title_canon_sha256":"a0e0879d08e63decbf363766eb56abc3618cdf2a76ea171d68541e2bfbc19dbc"},"schema_version":"1.0","source":{"id":"2608.01478","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2608.01478","created_at":"2026-08-04T02:05:29Z"},{"alias_kind":"arxiv_version","alias_value":"2608.01478v1","created_at":"2026-08-04T02:05:29Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2608.01478","created_at":"2026-08-04T02:05:29Z"},{"alias_kind":"pith_short_12","alias_value":"SBC24GB34NME","created_at":"2026-08-04T02:05:29Z"},{"alias_kind":"pith_short_16","alias_value":"SBC24GB34NMEIC7K","created_at":"2026-08-04T02:05:29Z"},{"alias_kind":"pith_short_8","alias_value":"SBC24GB3","created_at":"2026-08-04T02:05:29Z"}],"graph_snapshots":[{"event_id":"sha256:ee410917b34f418c9c9bda3ac869af48929d44b0207ee01190b2664da4b10be9","target":"graph","created_at":"2026-08-04T02:05:29Z","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/2608.01478/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Shallow nitrogen-vacancy (NV) centers in diamond are promising nanoscale quantum sensors, yet their coherence is strongly limited by surface-induced noise. Surface adsorbates are widely believed to be a major source of decoherence. Here, we test this assumption by characterizing shallow single NV centers under ultrahigh vacuum (UHV) conditions, where the diamond surface is kept free of adsorbates, and comparing their behavior to ambient conditions. Surprisingly, we observe a ~4x reduction in the Hahn echo coherence time T2 in UHV. By combining Hahn echo measurements in the single-quantum (SQ) ","authors_text":"David A. Fehr, Kalliope Zervas, Lila V. H. Rodgers, Michael E. Flatte, Nathalie P. de Leon, Patryk Gumann, Sorawis Sangtawesin, Zhiyang Yuan","cross_cats":["cond-mat.mtrl-sci"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2026-08-02T20:18:14Z","title":"Surface adsorbates suppress low-frequency noise for shallow nitrogen-vacancy centers"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2608.01478","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":"sha256:35e4687b804229f4d38702409e3bafbe99f07bed46e2a2439155093f22b8c07f","target":"record","created_at":"2026-08-04T02:05:29Z","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":"20338867af9b706827ca451473cf2d7f70fe132fb02fbf313efb793071bdcb96","cross_cats_sorted":["cond-mat.mtrl-sci"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2026-08-02T20:18:14Z","title_canon_sha256":"a0e0879d08e63decbf363766eb56abc3618cdf2a76ea171d68541e2bfbc19dbc"},"schema_version":"1.0","source":{"id":"2608.01478","kind":"arxiv","version":1}},"canonical_sha256":"9045ae183be358440bead3f56e0968e6c8e52b6b8dc61804bd52598f272795fc","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"9045ae183be358440bead3f56e0968e6c8e52b6b8dc61804bd52598f272795fc","first_computed_at":"2026-08-04T02:05:29.717886Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-08-04T02:05:29.717886Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"ZFlnlaZqE3ILEI2NfGZ+h8p1ilcqs4H7bW3nq819y9kUuf2S61/VLv6+aM9sOrmV1N8pcexqygS9S7+DHZeaAw==","signature_status":"signed_v1","signed_at":"2026-08-04T02:05:29.719649Z","signed_message":"canonical_sha256_bytes"},"source_id":"2608.01478","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:35e4687b804229f4d38702409e3bafbe99f07bed46e2a2439155093f22b8c07f","sha256:ee410917b34f418c9c9bda3ac869af48929d44b0207ee01190b2664da4b10be9"],"state_sha256":"8e727f5e5c807f6822e60fc8f87b4e3fd12b60d5e6b33860654fe9cad2732c0d"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"qvSAa7Z4HsAuN5A0z+1UcLkcUGJJ00f7rBK8Me/iQvWV8UXwkGndxRVDzKNzVX9AGKTuDqE1pyjU8mfKY+oRDw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-13T20:39:40.447441Z","bundle_sha256":"8adffe215b2d20c1321689f29e2af8a4acc74e8ef8617391df38c41aecc47505"}}