{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2020:HRCD3N4VK6PKS2HPZY7T3CHCYT","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":"80b99bf0ed1f8684286b97d9217c4c21aae3a91763ab37f15cba6ac26ae81570","cross_cats_sorted":["physics.optics"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2020-07-30T10:35:06Z","title_canon_sha256":"a900da34439d864e55be0f3b9d4b4bcdf1d0beaaa0ef6f85a3ab28425e310cfb"},"schema_version":"1.0","source":{"id":"2007.15364","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2007.15364","created_at":"2026-07-05T02:37:41Z"},{"alias_kind":"arxiv_version","alias_value":"2007.15364v2","created_at":"2026-07-05T02:37:41Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2007.15364","created_at":"2026-07-05T02:37:41Z"},{"alias_kind":"pith_short_12","alias_value":"HRCD3N4VK6PK","created_at":"2026-07-05T02:37:41Z"},{"alias_kind":"pith_short_16","alias_value":"HRCD3N4VK6PKS2HP","created_at":"2026-07-05T02:37:41Z"},{"alias_kind":"pith_short_8","alias_value":"HRCD3N4V","created_at":"2026-07-05T02:37:41Z"}],"graph_snapshots":[{"event_id":"sha256:883f2fd94bbef70c8395229118f22c3a7d6ac6b1240a3bef2eb1ea8ed0e94268","target":"graph","created_at":"2026-07-05T02:37:41Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2007.15364/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Entangled photon-pairs are a critical resource in quantum communication protocols ranging from quantum key distribution to teleportation. The current workhorse technique for producing photon-pairs is via spontaneous parametric down conversion (SPDC) in bulk nonlinear crystals. The increased prominence of quantum networks has led to growing interest in deployable high performance entangled photon-pair sources. This manuscript provides a review of the state-of-the-art for bulk-optics-based SPDC sources with continuous wave pump, and discusses some of the main considerations when building for dep","authors_text":"Alexander Ling, Ali Anwar, Chithrabhanu Perumangatt, Fabian Steinlechner, Thomas Jennewein","cross_cats":["physics.optics"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2020-07-30T10:35:06Z","title":"Entangled Photon-Pair Sources based on three-wave mixing in bulk crystals"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2007.15364","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":"sha256:9bcda452274b244da54c67f844923e58371aef0fc844fe75400816a145b9603e","target":"record","created_at":"2026-07-05T02:37:41Z","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":"80b99bf0ed1f8684286b97d9217c4c21aae3a91763ab37f15cba6ac26ae81570","cross_cats_sorted":["physics.optics"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2020-07-30T10:35:06Z","title_canon_sha256":"a900da34439d864e55be0f3b9d4b4bcdf1d0beaaa0ef6f85a3ab28425e310cfb"},"schema_version":"1.0","source":{"id":"2007.15364","kind":"arxiv","version":2}},"canonical_sha256":"3c443db795579ea968efce3f3d88e2c4ffce1303eb54c27828b12ae748d0a2ba","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"3c443db795579ea968efce3f3d88e2c4ffce1303eb54c27828b12ae748d0a2ba","first_computed_at":"2026-07-05T02:37:41.617456Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T02:37:41.617456Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"tR9TrOXjCV+haRXazIgbJN8cGni3A9gbTCRDyVTO7YiJJ0i4flY8TyD18nhMiogAJcYf04eoJ511G7rlMb/xAQ==","signature_status":"signed_v1","signed_at":"2026-07-05T02:37:41.617831Z","signed_message":"canonical_sha256_bytes"},"source_id":"2007.15364","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:9bcda452274b244da54c67f844923e58371aef0fc844fe75400816a145b9603e","sha256:883f2fd94bbef70c8395229118f22c3a7d6ac6b1240a3bef2eb1ea8ed0e94268"],"state_sha256":"697b41d49f792efada8774cb406af2617d04914b04056aded77b31d5453ff64c"}