{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:HWAKCMFMQQL3X4XOTZ2LYAVS6F","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":"2b16e68f6190415ad9f0f9bccfd9b8da3b9dc413055dc11d243a7517ca7d5e79","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2014-10-16T12:12:44Z","title_canon_sha256":"6b6987f4ada3c0364fa991c2252c635a0420e62a06113dd0269cf871e7d37334"},"schema_version":"1.0","source":{"id":"1410.4389","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1410.4389","created_at":"2026-05-18T02:29:45Z"},{"alias_kind":"arxiv_version","alias_value":"1410.4389v1","created_at":"2026-05-18T02:29:45Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1410.4389","created_at":"2026-05-18T02:29:45Z"},{"alias_kind":"pith_short_12","alias_value":"HWAKCMFMQQL3","created_at":"2026-05-18T12:28:30Z"},{"alias_kind":"pith_short_16","alias_value":"HWAKCMFMQQL3X4XO","created_at":"2026-05-18T12:28:30Z"},{"alias_kind":"pith_short_8","alias_value":"HWAKCMFM","created_at":"2026-05-18T12:28:30Z"}],"graph_snapshots":[{"event_id":"sha256:7149430378ac06d02d28dfab309c8545d152737075a084de1e69f41e846e5e42","target":"graph","created_at":"2026-05-18T02:29:45Z","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":"Nonlinear metal-dielectric layered structures are shown to be able to efficiently generate entangled photon pairs using spontaneous parametric down-conversion. Increase of electric-field amplitudes in these structures enhanced by the presence of metal layers is sufficient to compensate for losses inside thin metal layers. As an example, photon pairs emitted from a structure composed of alternating nonlinear dielectric GaN layers and metal Ag layers are analyzed in spectral, temporal as well as spatial domains. Also correlations and entanglement between two photons in a pair are determined. Ver","authors_text":"Dalibor Jav\\r{u}rek, Jan Pe\\v{r}ina Jr., Ji\\v{r}\\'i Svozil\\'ik","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2014-10-16T12:12:44Z","title":"Photon-pair generation in nonlinear metal-dielectric 1D photonic structures"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1410.4389","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":"sha256:469f41e3549468c5c1e0bbd646b7da094788b96a3aa1773a56d5c4948c47bf09","target":"record","created_at":"2026-05-18T02:29:45Z","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":"2b16e68f6190415ad9f0f9bccfd9b8da3b9dc413055dc11d243a7517ca7d5e79","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2014-10-16T12:12:44Z","title_canon_sha256":"6b6987f4ada3c0364fa991c2252c635a0420e62a06113dd0269cf871e7d37334"},"schema_version":"1.0","source":{"id":"1410.4389","kind":"arxiv","version":1}},"canonical_sha256":"3d80a130ac8417bbf2ee9e74bc02b2f1623f8529fe36e31159553beb5b9f9def","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"3d80a130ac8417bbf2ee9e74bc02b2f1623f8529fe36e31159553beb5b9f9def","first_computed_at":"2026-05-18T02:29:45.309236Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:29:45.309236Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"lBC6KPRapg6NU4yCnUkREw3yA1tgesF2CdpIeoWXYjDztSsdzP2Elxfr4u+g7ef1+KxtUf1l+PvWWDSPScVVCw==","signature_status":"signed_v1","signed_at":"2026-05-18T02:29:45.309664Z","signed_message":"canonical_sha256_bytes"},"source_id":"1410.4389","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:469f41e3549468c5c1e0bbd646b7da094788b96a3aa1773a56d5c4948c47bf09","sha256:7149430378ac06d02d28dfab309c8545d152737075a084de1e69f41e846e5e42"],"state_sha256":"95c327faa08c8af7a687220f514166da8dc8419b59ce9bd3d799ede9aedf68c8"}