{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:PU2DGLK6KC7UUCSAJ6OLKNMP5L","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":"7b70ca7b4a1f08ec05a94f087a7a2fb301eb51e6d7768c0c475905cf1d7b43be","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2015-05-11T21:37:22Z","title_canon_sha256":"392bff3a78104fde30bf0325d8394118ef828672169796846a3f3e5ef69dd286"},"schema_version":"1.0","source":{"id":"1505.02811","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1505.02811","created_at":"2026-05-18T01:29:21Z"},{"alias_kind":"arxiv_version","alias_value":"1505.02811v3","created_at":"2026-05-18T01:29:21Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1505.02811","created_at":"2026-05-18T01:29:21Z"},{"alias_kind":"pith_short_12","alias_value":"PU2DGLK6KC7U","created_at":"2026-05-18T12:29:37Z"},{"alias_kind":"pith_short_16","alias_value":"PU2DGLK6KC7UUCSA","created_at":"2026-05-18T12:29:37Z"},{"alias_kind":"pith_short_8","alias_value":"PU2DGLK6","created_at":"2026-05-18T12:29:37Z"}],"graph_snapshots":[{"event_id":"sha256:6ca0d1a7f85e85099200cbb24966273bb2463be2902c5e90421ba17bcff0cbb4","target":"graph","created_at":"2026-05-18T01:29:21Z","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":"To study the magnetic dynamics of superparamagnetic nanoparticles we use scanning probe relaxometry and dephasing of the nitrogen-vacancy (NV) center in diamond, characterizing the spin-noise of a single 10-nm magnetite particle. Additionally, we show the anisotropy of the NV sensitivity's dependence on the applied decoherence measurement method. By comparing the change in relaxation (T 1 ) and dephasing (T 2 ) time in the NV center when scanning a nanoparticle over it, we are able to extract the nanoparticle's diameter and distance from the NV center using an Ornstein-Uhlenbeck model for the ","authors_text":"Amit Finkler, Andrea Zappe, Dominik Schmid-Lorch, Friedemann Reinhard, J\\\"org Wrachtrup, Lapo Bogani, Michael Slota, Thomas H\\\"aberle","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2015-05-11T21:37:22Z","title":"Relaxometry and dephasing imaging of superparamagnetic magnetite nanoparticles using a single qubit"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1505.02811","kind":"arxiv","version":3},"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":"sha256:5c274bc7172f9fe7bd8b4d242c5737ecc2699111e473106eafb0d43d72a3c051","target":"record","created_at":"2026-05-18T01:29:21Z","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":"7b70ca7b4a1f08ec05a94f087a7a2fb301eb51e6d7768c0c475905cf1d7b43be","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2015-05-11T21:37:22Z","title_canon_sha256":"392bff3a78104fde30bf0325d8394118ef828672169796846a3f3e5ef69dd286"},"schema_version":"1.0","source":{"id":"1505.02811","kind":"arxiv","version":3}},"canonical_sha256":"7d34332d5e50bf4a0a404f9cb5358feaebcaa89e1c5199f89198e52d872d46da","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"7d34332d5e50bf4a0a404f9cb5358feaebcaa89e1c5199f89198e52d872d46da","first_computed_at":"2026-05-18T01:29:21.021881Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:29:21.021881Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"FAUkcBOBqLyqn74pWI5iRKszF0voDUZQlyfHyh0VKkvU6I/jFsBljy57ZGRP9GtPiiiOuIFCJcf3aYtXNtBYAw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:29:21.022565Z","signed_message":"canonical_sha256_bytes"},"source_id":"1505.02811","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:5c274bc7172f9fe7bd8b4d242c5737ecc2699111e473106eafb0d43d72a3c051","sha256:6ca0d1a7f85e85099200cbb24966273bb2463be2902c5e90421ba17bcff0cbb4"],"state_sha256":"9c6d2273b908ccd9b4e16e5248f8784d466375a5cb91092f6356f73d4f529940"}