{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:BQUMRSHIDCDKWQGLBZW4NX5QL4","short_pith_number":"pith:BQUMRSHI","canonical_record":{"source":{"id":"1507.08744","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2015-07-31T03:52:36Z","cross_cats_sorted":[],"title_canon_sha256":"7ed5f34e5bd8e5f4070c061a961bed4c1f98f3654a8ab4d8abe536ac8e3a27ff","abstract_canon_sha256":"fcafcedbfe038bafda22d541284b6edabbd26fdd93e0006ef248c687b4fd0f86"},"schema_version":"1.0"},"canonical_sha256":"0c28c8c8e81886ab40cb0e6dc6dfb05f3517651e1cde2fecf4807398231d53b5","source":{"kind":"arxiv","id":"1507.08744","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1507.08744","created_at":"2026-05-18T01:03:20Z"},{"alias_kind":"arxiv_version","alias_value":"1507.08744v2","created_at":"2026-05-18T01:03:20Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1507.08744","created_at":"2026-05-18T01:03:20Z"},{"alias_kind":"pith_short_12","alias_value":"BQUMRSHIDCDK","created_at":"2026-05-18T12:29:14Z"},{"alias_kind":"pith_short_16","alias_value":"BQUMRSHIDCDKWQGL","created_at":"2026-05-18T12:29:14Z"},{"alias_kind":"pith_short_8","alias_value":"BQUMRSHI","created_at":"2026-05-18T12:29:14Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:BQUMRSHIDCDKWQGLBZW4NX5QL4","target":"record","payload":{"canonical_record":{"source":{"id":"1507.08744","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2015-07-31T03:52:36Z","cross_cats_sorted":[],"title_canon_sha256":"7ed5f34e5bd8e5f4070c061a961bed4c1f98f3654a8ab4d8abe536ac8e3a27ff","abstract_canon_sha256":"fcafcedbfe038bafda22d541284b6edabbd26fdd93e0006ef248c687b4fd0f86"},"schema_version":"1.0"},"canonical_sha256":"0c28c8c8e81886ab40cb0e6dc6dfb05f3517651e1cde2fecf4807398231d53b5","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:03:20.367635Z","signature_b64":"kaZIETSCIo7xGK9ragV6VQuI0P6aqpS42XjVU4PY8imXIBOIlgbuX9f4OIEF1s5MI4+qVhxq43dm/r7hDKEYDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"0c28c8c8e81886ab40cb0e6dc6dfb05f3517651e1cde2fecf4807398231d53b5","last_reissued_at":"2026-05-18T01:03:20.367092Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:03:20.367092Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1507.08744","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":"2026-05-18T01:03:20Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"n/JepjCliqG2yUalV6c8lWH78aDOazRXjCyiY7WUOIe/uU7cIxZLTDOZpkQRSjD2dFiY8f2aDCSOG2W8wkVNDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T16:31:44.465938Z"},"content_sha256":"01bc4a2881d7819111f3eed0f10cc4f95294c35121b07e02170192b2ddbe6ea5","schema_version":"1.0","event_id":"sha256:01bc4a2881d7819111f3eed0f10cc4f95294c35121b07e02170192b2ddbe6ea5"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:BQUMRSHIDCDKWQGLBZW4NX5QL4","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Electron spin resonance spectroscopy of small ensemble paramagnetic spins using a single nitrogen-vacancy center in diamond","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mes-hall","authors_text":"Chathuranga Abeywardana, Franklin H. Cho, Susumu Takahashi, Viktor Stepanov","submitted_at":"2015-07-31T03:52:36Z","abstract_excerpt":"A nitrogen-vacancy (NV) center in diamond is a promising sensor for nanoscale magnetic sensing. Here we report electron spin resonance (ESR) spectroscopy using a single NV center in diamond. First, using a 230 GHz ESR spectrometer, we performed ensemble ESR of a type-Ib sample crystal and identified a substitutional single nitrogen impurity as a major paramagnetic center in the sample crystal. Then, we carried out free-induction decay and spin echo measurements of the single NV center to study static and dynamic properties of nanoscale bath spins surrounding the NV center. We also measured ESR"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1507.08744","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":""},"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":"2026-05-18T01:03:20Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"typxUvUsOXVgTT0ePCnVqOhsTTI0/Xg2WrDpdYe3shmQ3aiAmVTwLnb3VkxiKt6pghzNk9Q0OUKf0+qPcvMxCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T16:31:44.466367Z"},"content_sha256":"dc08ba026387eff3c30b0d1695a309fca55361de035f03ddccb4bb1f614ef66e","schema_version":"1.0","event_id":"sha256:dc08ba026387eff3c30b0d1695a309fca55361de035f03ddccb4bb1f614ef66e"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/BQUMRSHIDCDKWQGLBZW4NX5QL4/bundle.json","state_url":"https://pith.science/pith/BQUMRSHIDCDKWQGLBZW4NX5QL4/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/BQUMRSHIDCDKWQGLBZW4NX5QL4/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":"2026-05-26T16:31:44Z","links":{"resolver":"https://pith.science/pith/BQUMRSHIDCDKWQGLBZW4NX5QL4","bundle":"https://pith.science/pith/BQUMRSHIDCDKWQGLBZW4NX5QL4/bundle.json","state":"https://pith.science/pith/BQUMRSHIDCDKWQGLBZW4NX5QL4/state.json","well_known_bundle":"https://pith.science/.well-known/pith/BQUMRSHIDCDKWQGLBZW4NX5QL4/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:BQUMRSHIDCDKWQGLBZW4NX5QL4","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":"fcafcedbfe038bafda22d541284b6edabbd26fdd93e0006ef248c687b4fd0f86","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2015-07-31T03:52:36Z","title_canon_sha256":"7ed5f34e5bd8e5f4070c061a961bed4c1f98f3654a8ab4d8abe536ac8e3a27ff"},"schema_version":"1.0","source":{"id":"1507.08744","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1507.08744","created_at":"2026-05-18T01:03:20Z"},{"alias_kind":"arxiv_version","alias_value":"1507.08744v2","created_at":"2026-05-18T01:03:20Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1507.08744","created_at":"2026-05-18T01:03:20Z"},{"alias_kind":"pith_short_12","alias_value":"BQUMRSHIDCDK","created_at":"2026-05-18T12:29:14Z"},{"alias_kind":"pith_short_16","alias_value":"BQUMRSHIDCDKWQGL","created_at":"2026-05-18T12:29:14Z"},{"alias_kind":"pith_short_8","alias_value":"BQUMRSHI","created_at":"2026-05-18T12:29:14Z"}],"graph_snapshots":[{"event_id":"sha256:dc08ba026387eff3c30b0d1695a309fca55361de035f03ddccb4bb1f614ef66e","target":"graph","created_at":"2026-05-18T01:03:20Z","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":"A nitrogen-vacancy (NV) center in diamond is a promising sensor for nanoscale magnetic sensing. Here we report electron spin resonance (ESR) spectroscopy using a single NV center in diamond. First, using a 230 GHz ESR spectrometer, we performed ensemble ESR of a type-Ib sample crystal and identified a substitutional single nitrogen impurity as a major paramagnetic center in the sample crystal. Then, we carried out free-induction decay and spin echo measurements of the single NV center to study static and dynamic properties of nanoscale bath spins surrounding the NV center. We also measured ESR","authors_text":"Chathuranga Abeywardana, Franklin H. Cho, Susumu Takahashi, Viktor Stepanov","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2015-07-31T03:52:36Z","title":"Electron spin resonance spectroscopy of small ensemble paramagnetic spins using a single nitrogen-vacancy center in diamond"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1507.08744","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":"sha256:01bc4a2881d7819111f3eed0f10cc4f95294c35121b07e02170192b2ddbe6ea5","target":"record","created_at":"2026-05-18T01:03:20Z","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":"fcafcedbfe038bafda22d541284b6edabbd26fdd93e0006ef248c687b4fd0f86","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2015-07-31T03:52:36Z","title_canon_sha256":"7ed5f34e5bd8e5f4070c061a961bed4c1f98f3654a8ab4d8abe536ac8e3a27ff"},"schema_version":"1.0","source":{"id":"1507.08744","kind":"arxiv","version":2}},"canonical_sha256":"0c28c8c8e81886ab40cb0e6dc6dfb05f3517651e1cde2fecf4807398231d53b5","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"0c28c8c8e81886ab40cb0e6dc6dfb05f3517651e1cde2fecf4807398231d53b5","first_computed_at":"2026-05-18T01:03:20.367092Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:03:20.367092Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"kaZIETSCIo7xGK9ragV6VQuI0P6aqpS42XjVU4PY8imXIBOIlgbuX9f4OIEF1s5MI4+qVhxq43dm/r7hDKEYDQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:03:20.367635Z","signed_message":"canonical_sha256_bytes"},"source_id":"1507.08744","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:01bc4a2881d7819111f3eed0f10cc4f95294c35121b07e02170192b2ddbe6ea5","sha256:dc08ba026387eff3c30b0d1695a309fca55361de035f03ddccb4bb1f614ef66e"],"state_sha256":"7f05eca45f598c76048f60ece2f446468433aeb47e1dc6db2d1f93cd2a419036"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"eFC+phKR6hMZFnApfHYwLUz6ytvxa15lAtLsNeqaNtnzDG7j+eSath43aNYejxPkjY1UN/fnutl9hWgH0WyiAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T16:31:44.469391Z","bundle_sha256":"28e9ccf51d0decd52e2e3da8f940cba992a0758a3e81363717e34f262d24095e"}}