{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2010:XDLEY7F7Y34TI555EIPKROEVQW","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":"58d834cfedbd0b554e98a27260dec6e19f29a3a83b54a6cfe4e6ebe5903d5e21","cross_cats_sorted":["quant-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2010-01-25T10:33:49Z","title_canon_sha256":"b40dabbbfebe5d84eae3feebd045d5c0a1a6f150bfd5508d456f77d1831e5b42"},"schema_version":"1.0","source":{"id":"1001.4373","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1001.4373","created_at":"2026-05-18T02:09:30Z"},{"alias_kind":"arxiv_version","alias_value":"1001.4373v1","created_at":"2026-05-18T02:09:30Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1001.4373","created_at":"2026-05-18T02:09:30Z"},{"alias_kind":"pith_short_12","alias_value":"XDLEY7F7Y34T","created_at":"2026-05-18T12:26:17Z"},{"alias_kind":"pith_short_16","alias_value":"XDLEY7F7Y34TI555","created_at":"2026-05-18T12:26:17Z"},{"alias_kind":"pith_short_8","alias_value":"XDLEY7F7","created_at":"2026-05-18T12:26:17Z"}],"graph_snapshots":[{"event_id":"sha256:0eeeeb477b3bbce81cb7503ee3918f5943711a171caba73152740e257e6e727c","target":"graph","created_at":"2026-05-18T02:09:30Z","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":"Controlled fabrication and identification of bright single photon emitters is at the heart of quantum optics and materials science. Here we demonstrate a controlled engineering of a chromium bright single photon source in bulk diamond by ion implantation. The Cr center has fully polarized emission with a ZPL centered at 749 nm, FWHM of 4 nm, an extremely short lifetime of ~1 ns, and a count rate of 500 kcounts/s. By combining the polarization measurements and the vibronic spectra, a model of the center has been proposed consisting of one interstitial chromium atom with a transition dipole alon","authors_text":"Andrew D. Greentree, Brett C. Johnson, David A. Simpson, Igor Aharonovich, Jeffrey C. McCallum, Stefania Castelletto, Steven Prawer","cross_cats":["quant-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2010-01-25T10:33:49Z","title":"Chromium single photon emitters in diamond fabricated by ion implantation"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1001.4373","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":"sha256:7da504f662f9e04ca9e926a4a962ba45bbc7ae809e303e9917b9720a5143e6d8","target":"record","created_at":"2026-05-18T02:09:30Z","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":"58d834cfedbd0b554e98a27260dec6e19f29a3a83b54a6cfe4e6ebe5903d5e21","cross_cats_sorted":["quant-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2010-01-25T10:33:49Z","title_canon_sha256":"b40dabbbfebe5d84eae3feebd045d5c0a1a6f150bfd5508d456f77d1831e5b42"},"schema_version":"1.0","source":{"id":"1001.4373","kind":"arxiv","version":1}},"canonical_sha256":"b8d64c7cbfc6f93477bd221ea8b895858b64ba41f50cf2cb1102902ed101fd7b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b8d64c7cbfc6f93477bd221ea8b895858b64ba41f50cf2cb1102902ed101fd7b","first_computed_at":"2026-05-18T02:09:30.418381Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:09:30.418381Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"jxb5gc2GfBraBCkPF5+r+NOrVstQpBruW9D8NdWNLUOifna8+e54z9i/epSLfEIxpawgukZakWW4xdotxo1+Ag==","signature_status":"signed_v1","signed_at":"2026-05-18T02:09:30.418982Z","signed_message":"canonical_sha256_bytes"},"source_id":"1001.4373","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:7da504f662f9e04ca9e926a4a962ba45bbc7ae809e303e9917b9720a5143e6d8","sha256:0eeeeb477b3bbce81cb7503ee3918f5943711a171caba73152740e257e6e727c"],"state_sha256":"72526a7df0e837dfbde1450f9dc79d99c32f646d5ee5eeb3178336a32f83149d"}