{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:YMF3JRY5V6T2L374QOWI3TABFT","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":"c2364b9f4d60de38409208b4f2e84f0786a9b0a0e61b4f24d637f5a71bf9db4e","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2017-04-12T10:04:06Z","title_canon_sha256":"30a3651e8071e84448e906bad3f8b3510ed74ca6d77811801c6b8d0c80f42375"},"schema_version":"1.0","source":{"id":"1704.03683","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1704.03683","created_at":"2026-05-18T00:27:46Z"},{"alias_kind":"arxiv_version","alias_value":"1704.03683v2","created_at":"2026-05-18T00:27:46Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1704.03683","created_at":"2026-05-18T00:27:46Z"},{"alias_kind":"pith_short_12","alias_value":"YMF3JRY5V6T2","created_at":"2026-05-18T12:31:56Z"},{"alias_kind":"pith_short_16","alias_value":"YMF3JRY5V6T2L374","created_at":"2026-05-18T12:31:56Z"},{"alias_kind":"pith_short_8","alias_value":"YMF3JRY5","created_at":"2026-05-18T12:31:56Z"}],"graph_snapshots":[{"event_id":"sha256:2596380b2760a5c3edcf82c471542ed02ac21c74123de84b30bc3b3a4e89be3b","target":"graph","created_at":"2026-05-18T00:27:46Z","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":"Photonic quantum technology relies on efficient sources of coherent single photons, the ideal carriers of quantum information. Heralded single photons from parametric down-conversion can approximate on-demand single photons to a desired degree, with high spectral purities achieved through group-velocity matching and tailored crystal nonlinearities.\n  Here we propose crystal nonlinearity engineering techniques with sub-coherence-length domains. We first introduce a combination of two existing methods: a deterministic approach with coherence-length domains and probabilistic domain-width annealin","authors_text":"Agata M. Bra\\'nczyk, Alessandro Fedrizzi, Derryck T. Reid, Dmytro Kundys, Francesco Graffitti","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2017-04-12T10:04:06Z","title":"Pure down-conversion photons through sub-coherence length domain engineering"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1704.03683","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":"sha256:169b103578e8932e8d7e394e81a281ba569d6cf8612fa8e83633952e304e93b3","target":"record","created_at":"2026-05-18T00:27:46Z","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":"c2364b9f4d60de38409208b4f2e84f0786a9b0a0e61b4f24d637f5a71bf9db4e","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2017-04-12T10:04:06Z","title_canon_sha256":"30a3651e8071e84448e906bad3f8b3510ed74ca6d77811801c6b8d0c80f42375"},"schema_version":"1.0","source":{"id":"1704.03683","kind":"arxiv","version":2}},"canonical_sha256":"c30bb4c71dafa7a5effc83ac8dcc012cfd1ea231cd210c010d9fadfb886d8099","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c30bb4c71dafa7a5effc83ac8dcc012cfd1ea231cd210c010d9fadfb886d8099","first_computed_at":"2026-05-18T00:27:46.850671Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:27:46.850671Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"sDoZBEUNdjFmhEBpv1dhOOj7EppAMCOTmEdoG4ACP3lZZqF7sIGFO6iK5hMLVqvREaRusiG3OVj1qYTF4simCA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:27:46.851261Z","signed_message":"canonical_sha256_bytes"},"source_id":"1704.03683","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:169b103578e8932e8d7e394e81a281ba569d6cf8612fa8e83633952e304e93b3","sha256:2596380b2760a5c3edcf82c471542ed02ac21c74123de84b30bc3b3a4e89be3b"],"state_sha256":"606722542dfe1e75bcc0d49f55ceb66e771c35d0bb42899e3919ca1120f178c7"}