{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:J6AUZMJUK45TKNM2RGIHA25AS7","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":"a8daab16f3c6bc0487237fa1e339745cd2e79a0450395ca7b0500597f75a5e84","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2013-04-17T20:00:58Z","title_canon_sha256":"75acfc5b477797c1eac3b4d198ca1b88adfbd4d173fbb62bf4d73991fd116f64"},"schema_version":"1.0","source":{"id":"1304.4944","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1304.4944","created_at":"2026-05-18T02:49:39Z"},{"alias_kind":"arxiv_version","alias_value":"1304.4944v1","created_at":"2026-05-18T02:49:39Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1304.4944","created_at":"2026-05-18T02:49:39Z"},{"alias_kind":"pith_short_12","alias_value":"J6AUZMJUK45T","created_at":"2026-05-18T12:27:49Z"},{"alias_kind":"pith_short_16","alias_value":"J6AUZMJUK45TKNM2","created_at":"2026-05-18T12:27:49Z"},{"alias_kind":"pith_short_8","alias_value":"J6AUZMJU","created_at":"2026-05-18T12:27:49Z"}],"graph_snapshots":[{"event_id":"sha256:56f8aa3084b4b5ea82092b27b9d525de1313fa99e1819c46cff1b8aa1e25a0d0","target":"graph","created_at":"2026-05-18T02:49:39Z","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":"Creating miniature chip scale implementations of optical quantum information protocols is a dream for many in the quantum optics community. This is largely because of the promise of stability and scalability. Here we present a monolithically integratable chip architecture upon which is built a photonic device primitive called a Bragg reflection waveguide (BRW). Implemented in gallium arsenide, we show that, via the process of spontaneous parametric down conversion, the BRW is capable of directly producing polarization entangled photons without additional path difference compensation, spectral ","authors_text":"Adriano Della Frera, Alberto Tosi, Amr S. Helmy, Carmelo Scarcella, Dongpeng Kang, Gregor Weihs, John E. Sipe, Lukas G. Helt, Piotr Kolenderski, Rolf T. Horn, Sergei V. Zhukovsky, Thomas Jennewein","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2013-04-17T20:00:58Z","title":"Inherent polarization entanglement generated from a monolithic semiconductor chip"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1304.4944","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":"sha256:955257ce2befe691988fba2b1142664c9692bea739cd8da279c46ab92acdc757","target":"record","created_at":"2026-05-18T02:49:39Z","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":"a8daab16f3c6bc0487237fa1e339745cd2e79a0450395ca7b0500597f75a5e84","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2013-04-17T20:00:58Z","title_canon_sha256":"75acfc5b477797c1eac3b4d198ca1b88adfbd4d173fbb62bf4d73991fd116f64"},"schema_version":"1.0","source":{"id":"1304.4944","kind":"arxiv","version":1}},"canonical_sha256":"4f814cb134573b35359a8990706ba097e5ce0c707da22c937b0ce5e8da3eb7e2","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"4f814cb134573b35359a8990706ba097e5ce0c707da22c937b0ce5e8da3eb7e2","first_computed_at":"2026-05-18T02:49:39.025979Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:49:39.025979Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"QE1GoPGAJOGBPUBojluVSGtKoqcNgvmBEhyj+BpROrz5pnBUREAO0vQBk5T8ki91eSG9+SW4IlTyhrPOiE8yCw==","signature_status":"signed_v1","signed_at":"2026-05-18T02:49:39.026345Z","signed_message":"canonical_sha256_bytes"},"source_id":"1304.4944","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:955257ce2befe691988fba2b1142664c9692bea739cd8da279c46ab92acdc757","sha256:56f8aa3084b4b5ea82092b27b9d525de1313fa99e1819c46cff1b8aa1e25a0d0"],"state_sha256":"ebb18d9b215cbce38ec3bacbf509e63f06dd995809c9e2a285197ac35b64c321"}