{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2012:C7AZQMEN46OAL43UIPPFQVOYFJ","short_pith_number":"pith:C7AZQMEN","canonical_record":{"source":{"id":"1209.3365","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2012-09-15T07:26:49Z","cross_cats_sorted":["cond-mat.mes-hall"],"title_canon_sha256":"42438a9a01273f3efc8c56bab2810150c2ef2270a502ab3cebe67d0354a1a435","abstract_canon_sha256":"400b0b39570c3d5dbd1acb6a11c542e1d64c07942b25eac8c4a15e107aa7a0aa"},"schema_version":"1.0"},"canonical_sha256":"17c198308de79c05f37443de5855d82a76e7e42f2753ff7431a761aada9249eb","source":{"kind":"arxiv","id":"1209.3365","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1209.3365","created_at":"2026-05-18T01:54:28Z"},{"alias_kind":"arxiv_version","alias_value":"1209.3365v1","created_at":"2026-05-18T01:54:28Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1209.3365","created_at":"2026-05-18T01:54:28Z"},{"alias_kind":"pith_short_12","alias_value":"C7AZQMEN46OA","created_at":"2026-05-18T12:27:01Z"},{"alias_kind":"pith_short_16","alias_value":"C7AZQMEN46OAL43U","created_at":"2026-05-18T12:27:01Z"},{"alias_kind":"pith_short_8","alias_value":"C7AZQMEN","created_at":"2026-05-18T12:27:01Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2012:C7AZQMEN46OAL43UIPPFQVOYFJ","target":"record","payload":{"canonical_record":{"source":{"id":"1209.3365","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2012-09-15T07:26:49Z","cross_cats_sorted":["cond-mat.mes-hall"],"title_canon_sha256":"42438a9a01273f3efc8c56bab2810150c2ef2270a502ab3cebe67d0354a1a435","abstract_canon_sha256":"400b0b39570c3d5dbd1acb6a11c542e1d64c07942b25eac8c4a15e107aa7a0aa"},"schema_version":"1.0"},"canonical_sha256":"17c198308de79c05f37443de5855d82a76e7e42f2753ff7431a761aada9249eb","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:54:28.796525Z","signature_b64":"1lIdtBUAWwET414D/+Ry6QEog+plr6X406iSf0FJN/nh7vAH0FQTY1V7iHGccNf+DZsOa3M4el+Dr7ZHDm+uBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"17c198308de79c05f37443de5855d82a76e7e42f2753ff7431a761aada9249eb","last_reissued_at":"2026-05-18T01:54:28.795886Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:54:28.795886Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1209.3365","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":"2026-05-18T01:54:28Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"b80n6pvuZxsQyBhVdF2ebHD4nlS8wGaM8URLjP4IKm1wX/sjIMr+YEmKvCpk0bzoW3pbMbCanF6soN2yo32OBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T12:55:06.032013Z"},"content_sha256":"ce838b2e7d602c0aaf0d9192b55a784de86a273f95cade4abea2790c59eecd5c","schema_version":"1.0","event_id":"sha256:ce838b2e7d602c0aaf0d9192b55a784de86a273f95cade4abea2790c59eecd5c"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2012:C7AZQMEN46OAL43UIPPFQVOYFJ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Spin decoherence and electron spin bath noise of a nitrogen-vacancy center in diamond","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.mes-hall"],"primary_cat":"quant-ph","authors_text":"Susumu Takahashi, Zhi-Hui Wang","submitted_at":"2012-09-15T07:26:49Z","abstract_excerpt":"We theoretically investigate spin decoherence of a single nitrogen-vacancy (NV) center in diamond. Using the spin coherent state P-representation method, coherence evolution of the NV center surrounded by nitrogen electron spins (N) is simulated. We find that spin decoherence time as well as free-induction decay of the NV center depend on the spatial configuration of N spins. Both the spin decoherence rate (1/T2) and dephasing rate (1/T2*) of the NV center increase linearly with the concentration of the N spins. Using the P-representation method, we also demonstrate extracting noise spectrum o"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1209.3365","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":"2026-05-18T01:54:28Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"8f5P8n7pSUn8HpK0tvbLC77NUcg5h55oYeDlZekoJpAN80BCojGq74Abr7PAMitzo9DWmJF8O1tKhBeTHmY9Bw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T12:55:06.032793Z"},"content_sha256":"1181e6d6012a8602fe6c0a1b88397f0c06ef559aeafba2b96d7229c3594a5471","schema_version":"1.0","event_id":"sha256:1181e6d6012a8602fe6c0a1b88397f0c06ef559aeafba2b96d7229c3594a5471"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/C7AZQMEN46OAL43UIPPFQVOYFJ/bundle.json","state_url":"https://pith.science/pith/C7AZQMEN46OAL43UIPPFQVOYFJ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/C7AZQMEN46OAL43UIPPFQVOYFJ/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":"2026-05-26T12:55:06Z","links":{"resolver":"https://pith.science/pith/C7AZQMEN46OAL43UIPPFQVOYFJ","bundle":"https://pith.science/pith/C7AZQMEN46OAL43UIPPFQVOYFJ/bundle.json","state":"https://pith.science/pith/C7AZQMEN46OAL43UIPPFQVOYFJ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/C7AZQMEN46OAL43UIPPFQVOYFJ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:C7AZQMEN46OAL43UIPPFQVOYFJ","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":"400b0b39570c3d5dbd1acb6a11c542e1d64c07942b25eac8c4a15e107aa7a0aa","cross_cats_sorted":["cond-mat.mes-hall"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2012-09-15T07:26:49Z","title_canon_sha256":"42438a9a01273f3efc8c56bab2810150c2ef2270a502ab3cebe67d0354a1a435"},"schema_version":"1.0","source":{"id":"1209.3365","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1209.3365","created_at":"2026-05-18T01:54:28Z"},{"alias_kind":"arxiv_version","alias_value":"1209.3365v1","created_at":"2026-05-18T01:54:28Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1209.3365","created_at":"2026-05-18T01:54:28Z"},{"alias_kind":"pith_short_12","alias_value":"C7AZQMEN46OA","created_at":"2026-05-18T12:27:01Z"},{"alias_kind":"pith_short_16","alias_value":"C7AZQMEN46OAL43U","created_at":"2026-05-18T12:27:01Z"},{"alias_kind":"pith_short_8","alias_value":"C7AZQMEN","created_at":"2026-05-18T12:27:01Z"}],"graph_snapshots":[{"event_id":"sha256:1181e6d6012a8602fe6c0a1b88397f0c06ef559aeafba2b96d7229c3594a5471","target":"graph","created_at":"2026-05-18T01:54:28Z","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":"We theoretically investigate spin decoherence of a single nitrogen-vacancy (NV) center in diamond. Using the spin coherent state P-representation method, coherence evolution of the NV center surrounded by nitrogen electron spins (N) is simulated. We find that spin decoherence time as well as free-induction decay of the NV center depend on the spatial configuration of N spins. Both the spin decoherence rate (1/T2) and dephasing rate (1/T2*) of the NV center increase linearly with the concentration of the N spins. Using the P-representation method, we also demonstrate extracting noise spectrum o","authors_text":"Susumu Takahashi, Zhi-Hui Wang","cross_cats":["cond-mat.mes-hall"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2012-09-15T07:26:49Z","title":"Spin decoherence and electron spin bath noise of a nitrogen-vacancy center in diamond"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1209.3365","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:ce838b2e7d602c0aaf0d9192b55a784de86a273f95cade4abea2790c59eecd5c","target":"record","created_at":"2026-05-18T01:54:28Z","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":"400b0b39570c3d5dbd1acb6a11c542e1d64c07942b25eac8c4a15e107aa7a0aa","cross_cats_sorted":["cond-mat.mes-hall"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2012-09-15T07:26:49Z","title_canon_sha256":"42438a9a01273f3efc8c56bab2810150c2ef2270a502ab3cebe67d0354a1a435"},"schema_version":"1.0","source":{"id":"1209.3365","kind":"arxiv","version":1}},"canonical_sha256":"17c198308de79c05f37443de5855d82a76e7e42f2753ff7431a761aada9249eb","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"17c198308de79c05f37443de5855d82a76e7e42f2753ff7431a761aada9249eb","first_computed_at":"2026-05-18T01:54:28.795886Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:54:28.795886Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"1lIdtBUAWwET414D/+Ry6QEog+plr6X406iSf0FJN/nh7vAH0FQTY1V7iHGccNf+DZsOa3M4el+Dr7ZHDm+uBA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:54:28.796525Z","signed_message":"canonical_sha256_bytes"},"source_id":"1209.3365","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:ce838b2e7d602c0aaf0d9192b55a784de86a273f95cade4abea2790c59eecd5c","sha256:1181e6d6012a8602fe6c0a1b88397f0c06ef559aeafba2b96d7229c3594a5471"],"state_sha256":"5435a7f92fbcafa43522f5548e27929bb7ca31b67ff1baf7752c2c4c1ccf7c31"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"R/3aO1hRa8PPZQt8I8FxlsgLmh5cdi3ZUJUS2B2w6uO5NInejem32WuuaG5TgriD6BPEma+0UW0GFj1pzfw3Ag==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T12:55:06.037019Z","bundle_sha256":"75680c0da095a92a55d82d0be566811b19aba5ba0f5440d6d8ff706f9d9705a6"}}