{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:HZLZLIEKC2L6DLLC6GDYN6M2BS","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":"614165367ffbf7f935e838f788d47b56eee5c6335a3b83347757dfea7347dffc","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2013-04-24T21:10:16Z","title_canon_sha256":"6484de17038faba309c199845d4112f1d6383c6fce5df6c978de15372622cbea"},"schema_version":"1.0","source":{"id":"1304.6750","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1304.6750","created_at":"2026-05-18T01:50:22Z"},{"alias_kind":"arxiv_version","alias_value":"1304.6750v1","created_at":"2026-05-18T01:50:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1304.6750","created_at":"2026-05-18T01:50:22Z"},{"alias_kind":"pith_short_12","alias_value":"HZLZLIEKC2L6","created_at":"2026-05-18T12:27:46Z"},{"alias_kind":"pith_short_16","alias_value":"HZLZLIEKC2L6DLLC","created_at":"2026-05-18T12:27:46Z"},{"alias_kind":"pith_short_8","alias_value":"HZLZLIEK","created_at":"2026-05-18T12:27:46Z"}],"graph_snapshots":[{"event_id":"sha256:21292a111644ece3ae3d80f6056c22d89653c56b8e8fc6656e887a496a9339f8","target":"graph","created_at":"2026-05-18T01:50:22Z","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 experimentally demonstrate a broadband enhancement of emission from nitrogen vacancy centers in nanodiamonds. The enhancement is achieved by using a multilayer metamaterial with hyperbolic dispersion. The metamaterial is fabricated as a stack of alternating gold and alumina layers. Our approach paves the way towards the construction of efficient single-photon sources as planar on-chip devices.","authors_text":"A. Lagutchev, A. V. Kildishev, J. Irudayaraj, J. Liu, M. Y. Shalaginov, S. Ishii, V. M. Shalaev","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2013-04-24T21:10:16Z","title":"Broadband enhancement of spontaneous emission from nitrogen-vacancy centers in nanodiamonds by hyperbolic metamaterials"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1304.6750","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":"sha256:05648cadb640f444fd837ec46fad12deeb51befc060ea935dee869fc50ef1fae","target":"record","created_at":"2026-05-18T01:50:22Z","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":"614165367ffbf7f935e838f788d47b56eee5c6335a3b83347757dfea7347dffc","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2013-04-24T21:10:16Z","title_canon_sha256":"6484de17038faba309c199845d4112f1d6383c6fce5df6c978de15372622cbea"},"schema_version":"1.0","source":{"id":"1304.6750","kind":"arxiv","version":1}},"canonical_sha256":"3e5795a08a1697e1ad62f18786f99a0c9e4c3794bad7e97f07a81574204fd056","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"3e5795a08a1697e1ad62f18786f99a0c9e4c3794bad7e97f07a81574204fd056","first_computed_at":"2026-05-18T01:50:22.198063Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:50:22.198063Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"19AxPAZKOJSs6CfFTl+07trCeGzUsdHyVumDjWeL0D1HVyPD1N0d5QiEWrW4ghbBTI4/wNv1RLagcTb08nVbCQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:50:22.198922Z","signed_message":"canonical_sha256_bytes"},"source_id":"1304.6750","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:05648cadb640f444fd837ec46fad12deeb51befc060ea935dee869fc50ef1fae","sha256:21292a111644ece3ae3d80f6056c22d89653c56b8e8fc6656e887a496a9339f8"],"state_sha256":"29632020cb321558e9fab87c4ce38a6ff54ffe1495c020e4149b1b7a2a7ad8ff"}