{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:IGHHEVWUHI246O52BRJSFA54S6","short_pith_number":"pith:IGHHEVWU","canonical_record":{"source":{"id":"1310.1133","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2013-10-03T23:35:54Z","cross_cats_sorted":["quant-ph"],"title_canon_sha256":"392fe14a5d6fe3b5ca9c48626cf65c5df85d67d6122cb3d2f4a40c29ab02740f","abstract_canon_sha256":"60afed36734a71d1ffb359641fb40360d5ccca7a08dfd65d36e3dd577eecd70a"},"schema_version":"1.0"},"canonical_sha256":"418e7256d43a35cf3bba0c532283bc979546b5c70fac32dfd39c54cf766623b6","source":{"kind":"arxiv","id":"1310.1133","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1310.1133","created_at":"2026-05-18T01:47:15Z"},{"alias_kind":"arxiv_version","alias_value":"1310.1133v1","created_at":"2026-05-18T01:47:15Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1310.1133","created_at":"2026-05-18T01:47:15Z"},{"alias_kind":"pith_short_12","alias_value":"IGHHEVWUHI24","created_at":"2026-05-18T12:27:46Z"},{"alias_kind":"pith_short_16","alias_value":"IGHHEVWUHI246O52","created_at":"2026-05-18T12:27:46Z"},{"alias_kind":"pith_short_8","alias_value":"IGHHEVWU","created_at":"2026-05-18T12:27:46Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:IGHHEVWUHI246O52BRJSFA54S6","target":"record","payload":{"canonical_record":{"source":{"id":"1310.1133","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2013-10-03T23:35:54Z","cross_cats_sorted":["quant-ph"],"title_canon_sha256":"392fe14a5d6fe3b5ca9c48626cf65c5df85d67d6122cb3d2f4a40c29ab02740f","abstract_canon_sha256":"60afed36734a71d1ffb359641fb40360d5ccca7a08dfd65d36e3dd577eecd70a"},"schema_version":"1.0"},"canonical_sha256":"418e7256d43a35cf3bba0c532283bc979546b5c70fac32dfd39c54cf766623b6","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:47:15.542499Z","signature_b64":"1n619DZB1DG1hGnOjNbY/CjQm2kMK1QmldZmIDKCY3Z3l6N7m/UWBZUObIwtO73HBhInz/Ur91bf+vi/so9VAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"418e7256d43a35cf3bba0c532283bc979546b5c70fac32dfd39c54cf766623b6","last_reissued_at":"2026-05-18T01:47:15.541742Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:47:15.541742Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1310.1133","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":"2026-05-18T01:47:15Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"kw57q3/HrBk05xclye4OKT8wOi4c4RKkK/fJodnv7HzmXF9NKnlWcYf+CQSuiodG1hSb8kUAMVASG4e/1vvzBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-19T16:18:02.590626Z"},"content_sha256":"23063ba416a9772a1adb6d7216df85db6ee2db019a852382ab78ec5ddd9fdd70","schema_version":"1.0","event_id":"sha256:23063ba416a9772a1adb6d7216df85db6ee2db019a852382ab78ec5ddd9fdd70"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:IGHHEVWUHI246O52BRJSFA54S6","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Observing bulk diamond spin coherence in high-purity nanodiamonds","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["quant-ph"],"primary_cat":"cond-mat.mes-hall","authors_text":"Dhiren M. Kara, Helena S. Knowles, Mete Atature","submitted_at":"2013-10-03T23:35:54Z","abstract_excerpt":"Nitrogen-vacancy centres (NVs) in diamond are attractive for research straddling quantum information science and nanoscale magnetometry and thermometry. While ultrapure bulk diamond NVs sustain the longest spin coherence times among optically accessible spins, nanodiamond NVs display persistently poor spin coherence. Here we introduce high-purity nanodiamonds accommodating record-long NV coherence times, >60 us, observed via universal dynamical decoupling. We show that the main contribution to decoherence comes from nearby nitrogen impurities rather than surface states. We protect the NV spin "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1310.1133","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":""},"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":"2026-05-18T01:47:15Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"9Z7H3e/azUMbAXWBPNQkSDDLuoxcUUGGkF1IzfdavZLar2iqCs4z347nqALIei11/25lSh27DNTHQDOnRnLmCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-19T16:18:02.590980Z"},"content_sha256":"50b47b0a191f5b52c2b587d60fff77fec3edd2c81fe87fab0942410d07daf962","schema_version":"1.0","event_id":"sha256:50b47b0a191f5b52c2b587d60fff77fec3edd2c81fe87fab0942410d07daf962"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/IGHHEVWUHI246O52BRJSFA54S6/bundle.json","state_url":"https://pith.science/pith/IGHHEVWUHI246O52BRJSFA54S6/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/IGHHEVWUHI246O52BRJSFA54S6/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":"2026-05-19T16:18:02Z","links":{"resolver":"https://pith.science/pith/IGHHEVWUHI246O52BRJSFA54S6","bundle":"https://pith.science/pith/IGHHEVWUHI246O52BRJSFA54S6/bundle.json","state":"https://pith.science/pith/IGHHEVWUHI246O52BRJSFA54S6/state.json","well_known_bundle":"https://pith.science/.well-known/pith/IGHHEVWUHI246O52BRJSFA54S6/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:IGHHEVWUHI246O52BRJSFA54S6","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":"60afed36734a71d1ffb359641fb40360d5ccca7a08dfd65d36e3dd577eecd70a","cross_cats_sorted":["quant-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2013-10-03T23:35:54Z","title_canon_sha256":"392fe14a5d6fe3b5ca9c48626cf65c5df85d67d6122cb3d2f4a40c29ab02740f"},"schema_version":"1.0","source":{"id":"1310.1133","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1310.1133","created_at":"2026-05-18T01:47:15Z"},{"alias_kind":"arxiv_version","alias_value":"1310.1133v1","created_at":"2026-05-18T01:47:15Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1310.1133","created_at":"2026-05-18T01:47:15Z"},{"alias_kind":"pith_short_12","alias_value":"IGHHEVWUHI24","created_at":"2026-05-18T12:27:46Z"},{"alias_kind":"pith_short_16","alias_value":"IGHHEVWUHI246O52","created_at":"2026-05-18T12:27:46Z"},{"alias_kind":"pith_short_8","alias_value":"IGHHEVWU","created_at":"2026-05-18T12:27:46Z"}],"graph_snapshots":[{"event_id":"sha256:50b47b0a191f5b52c2b587d60fff77fec3edd2c81fe87fab0942410d07daf962","target":"graph","created_at":"2026-05-18T01:47:15Z","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"},"paper":{"abstract_excerpt":"Nitrogen-vacancy centres (NVs) in diamond are attractive for research straddling quantum information science and nanoscale magnetometry and thermometry. While ultrapure bulk diamond NVs sustain the longest spin coherence times among optically accessible spins, nanodiamond NVs display persistently poor spin coherence. Here we introduce high-purity nanodiamonds accommodating record-long NV coherence times, >60 us, observed via universal dynamical decoupling. We show that the main contribution to decoherence comes from nearby nitrogen impurities rather than surface states. We protect the NV spin ","authors_text":"Dhiren M. Kara, Helena S. Knowles, Mete Atature","cross_cats":["quant-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2013-10-03T23:35:54Z","title":"Observing bulk diamond spin coherence in high-purity nanodiamonds"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1310.1133","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":"sha256:23063ba416a9772a1adb6d7216df85db6ee2db019a852382ab78ec5ddd9fdd70","target":"record","created_at":"2026-05-18T01:47:15Z","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":"60afed36734a71d1ffb359641fb40360d5ccca7a08dfd65d36e3dd577eecd70a","cross_cats_sorted":["quant-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2013-10-03T23:35:54Z","title_canon_sha256":"392fe14a5d6fe3b5ca9c48626cf65c5df85d67d6122cb3d2f4a40c29ab02740f"},"schema_version":"1.0","source":{"id":"1310.1133","kind":"arxiv","version":1}},"canonical_sha256":"418e7256d43a35cf3bba0c532283bc979546b5c70fac32dfd39c54cf766623b6","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"418e7256d43a35cf3bba0c532283bc979546b5c70fac32dfd39c54cf766623b6","first_computed_at":"2026-05-18T01:47:15.541742Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:47:15.541742Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"1n619DZB1DG1hGnOjNbY/CjQm2kMK1QmldZmIDKCY3Z3l6N7m/UWBZUObIwtO73HBhInz/Ur91bf+vi/so9VAg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:47:15.542499Z","signed_message":"canonical_sha256_bytes"},"source_id":"1310.1133","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:23063ba416a9772a1adb6d7216df85db6ee2db019a852382ab78ec5ddd9fdd70","sha256:50b47b0a191f5b52c2b587d60fff77fec3edd2c81fe87fab0942410d07daf962"],"state_sha256":"acb6b437aec22e7f4017d9f5d9b1a05c926b6b699464f05cbccbb06473389cca"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"WnPeepA0SZ6JzdfMZMw1RuR2whTPkjbHd3AfC4gb7XzdF73y3G2qhi4T+z9Aq5RoG0B+9VdMjBpd7qDQlCxqCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-19T16:18:02.593279Z","bundle_sha256":"f8557ea6e06e99c3d17390ac938c60cdf456d294dd5fc8f99ca5f77369f592ed"}}