{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2008:VXYIPEYJ6A27ADGY4BVRPM3QJV","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":"76831e881ea9c9d6df164a08761288ed95625cc444480d7c6ecffe6a98087b33","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2008-10-06T17:20:18Z","title_canon_sha256":"d06cf7842c686ce3095e41397de290215834577ac5b44ca82947cf26c235244a"},"schema_version":"1.0","source":{"id":"0810.0998","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0810.0998","created_at":"2026-05-18T02:15:32Z"},{"alias_kind":"arxiv_version","alias_value":"0810.0998v1","created_at":"2026-05-18T02:15:32Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0810.0998","created_at":"2026-05-18T02:15:32Z"},{"alias_kind":"pith_short_12","alias_value":"VXYIPEYJ6A27","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_16","alias_value":"VXYIPEYJ6A27ADGY","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_8","alias_value":"VXYIPEYJ","created_at":"2026-05-18T12:25:58Z"}],"graph_snapshots":[{"event_id":"sha256:d886603f327175efea6c9d6de77254ec029ecc95677de3c3f6d25ca990fc2548","target":"graph","created_at":"2026-05-18T02:15:32Z","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 study the spectral properties of Spontaneous Parametric Down Conversion in a periodically poled waveguided structure of KTP crystal pumped by ultra-short pulses. Our theoretical analysis reveals a strongly multimode and asymmetric structure of the two-photon spectral amplitude for type-II SPDC. Experimental evidence, based on Hong-Ou-Mandel polarization interference with narrowband filtering, confirms this result.","authors_text":"Christine Silberhorn, Gerd Leuchs, Leonid A. Krivitsky, Malte Avenhaus, Maria V. Chekhova","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2008-10-06T17:20:18Z","title":"Two-Photon Polarization Interference for Pulsed SPDC in a PPKTP Waveguide"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0810.0998","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:aead07a52f5a16cf84eb3fec8e72ccfc3fa8e81b39ce7ac6a0d720deaf762579","target":"record","created_at":"2026-05-18T02:15:32Z","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":"76831e881ea9c9d6df164a08761288ed95625cc444480d7c6ecffe6a98087b33","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2008-10-06T17:20:18Z","title_canon_sha256":"d06cf7842c686ce3095e41397de290215834577ac5b44ca82947cf26c235244a"},"schema_version":"1.0","source":{"id":"0810.0998","kind":"arxiv","version":1}},"canonical_sha256":"adf0879309f035f00cd8e06b17b3704d6bacc7c5b5feb6f6d5880ddf149df5e9","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"adf0879309f035f00cd8e06b17b3704d6bacc7c5b5feb6f6d5880ddf149df5e9","first_computed_at":"2026-05-18T02:15:32.754364Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:15:32.754364Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"9dKkMtbBsxxugcw11h+Pan5dC2m4vFaIJ0opAaF+PyTNOrSJQAYPmvqbRA7xeeqPj8116y/RjKRTeH4DmAu4Cg==","signature_status":"signed_v1","signed_at":"2026-05-18T02:15:32.755096Z","signed_message":"canonical_sha256_bytes"},"source_id":"0810.0998","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:aead07a52f5a16cf84eb3fec8e72ccfc3fa8e81b39ce7ac6a0d720deaf762579","sha256:d886603f327175efea6c9d6de77254ec029ecc95677de3c3f6d25ca990fc2548"],"state_sha256":"0ee14d7d4e5cec01fff554ed6598bd2aff698a52c182521cdd35597b7bd27bc8"}