{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2023:XRIDZSKJGCU5472G7GTEGTF7P2","short_pith_number":"pith:XRIDZSKJ","schema_version":"1.0","canonical_sha256":"bc503cc94930a9de7f46f9a6434cbf7ebd42086289faa7e2c9de56602fbaaaf3","source":{"kind":"arxiv","id":"2307.06473","version":1},"attestation_state":"computed","paper":{"title":"Oscillating photonic Bell state from a semiconductor quantum dot for quantum key distribution","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Andreas Fognini, Brady Cunard, Dan Dalacu, Klaus D. J\\\"ons, Matteo Pennacchietti, Michael E. Reimer, Mohd Zeeshan, Norbert L\\\"utkenhaus, Philip J. Poole, Sayan Gangopadhyay, Shlok Nahar, Thomas Jennewein, Val Zwiller","submitted_at":"2023-07-12T22:09:19Z","abstract_excerpt":"An on-demand source of bright entangled photon pairs is desirable for quantum key distribution (QKD) and quantum repeaters. The leading candidate to generate entangled photon pairs is based on spontaneous parametric down-conversion (SPDC) in a non-linear crystal. However, there exists a fundamental trade-off between entanglement fidelity and efficiency in SPDC sources due to multiphoton emission at high brightness, which limits the pair extraction efficiency to 0.1% when operating at near-unity fidelity. Quantum dots in photonic nanostructures can in principle overcome this trade-off; however,"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"2307.06473","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2023-07-12T22:09:19Z","cross_cats_sorted":[],"title_canon_sha256":"dbe375a20cc541f886009ef222b4d4301575a486f7ce0b3516c7600ae5fe517c","abstract_canon_sha256":"05220bb4b5de9dc4ba967cbfd1307ca1f0f78c84a7b6c974bb4bd26a02391d0c"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T08:17:47.976855Z","signature_b64":"pxDmBhDxV1GRc4FvGPl3GHY35tVnUHCfthvTIwnEFFzrn8O5kBNoIu0b6goZSghGuD6R+ESDCfmp1h2X5fpqAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"bc503cc94930a9de7f46f9a6434cbf7ebd42086289faa7e2c9de56602fbaaaf3","last_reissued_at":"2026-07-05T08:17:47.976376Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T08:17:47.976376Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Oscillating photonic Bell state from a semiconductor quantum dot for quantum key distribution","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Andreas Fognini, Brady Cunard, Dan Dalacu, Klaus D. J\\\"ons, Matteo Pennacchietti, Michael E. Reimer, Mohd Zeeshan, Norbert L\\\"utkenhaus, Philip J. Poole, Sayan Gangopadhyay, Shlok Nahar, Thomas Jennewein, Val Zwiller","submitted_at":"2023-07-12T22:09:19Z","abstract_excerpt":"An on-demand source of bright entangled photon pairs is desirable for quantum key distribution (QKD) and quantum repeaters. The leading candidate to generate entangled photon pairs is based on spontaneous parametric down-conversion (SPDC) in a non-linear crystal. However, there exists a fundamental trade-off between entanglement fidelity and efficiency in SPDC sources due to multiphoton emission at high brightness, which limits the pair extraction efficiency to 0.1% when operating at near-unity fidelity. Quantum dots in photonic nanostructures can in principle overcome this trade-off; however,"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2307.06473","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2307.06473/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"aliases":[{"alias_kind":"arxiv","alias_value":"2307.06473","created_at":"2026-07-05T08:17:47.976433+00:00"},{"alias_kind":"arxiv_version","alias_value":"2307.06473v1","created_at":"2026-07-05T08:17:47.976433+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2307.06473","created_at":"2026-07-05T08:17:47.976433+00:00"},{"alias_kind":"pith_short_12","alias_value":"XRIDZSKJGCU5","created_at":"2026-07-05T08:17:47.976433+00:00"},{"alias_kind":"pith_short_16","alias_value":"XRIDZSKJGCU5472G","created_at":"2026-07-05T08:17:47.976433+00:00"},{"alias_kind":"pith_short_8","alias_value":"XRIDZSKJ","created_at":"2026-07-05T08:17:47.976433+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/XRIDZSKJGCU5472G7GTEGTF7P2","json":"https://pith.science/pith/XRIDZSKJGCU5472G7GTEGTF7P2.json","graph_json":"https://pith.science/api/pith-number/XRIDZSKJGCU5472G7GTEGTF7P2/graph.json","events_json":"https://pith.science/api/pith-number/XRIDZSKJGCU5472G7GTEGTF7P2/events.json","paper":"https://pith.science/paper/XRIDZSKJ"},"agent_actions":{"view_html":"https://pith.science/pith/XRIDZSKJGCU5472G7GTEGTF7P2","download_json":"https://pith.science/pith/XRIDZSKJGCU5472G7GTEGTF7P2.json","view_paper":"https://pith.science/paper/XRIDZSKJ","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=2307.06473&json=true","fetch_graph":"https://pith.science/api/pith-number/XRIDZSKJGCU5472G7GTEGTF7P2/graph.json","fetch_events":"https://pith.science/api/pith-number/XRIDZSKJGCU5472G7GTEGTF7P2/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/XRIDZSKJGCU5472G7GTEGTF7P2/action/timestamp_anchor","attest_storage":"https://pith.science/pith/XRIDZSKJGCU5472G7GTEGTF7P2/action/storage_attestation","attest_author":"https://pith.science/pith/XRIDZSKJGCU5472G7GTEGTF7P2/action/author_attestation","sign_citation":"https://pith.science/pith/XRIDZSKJGCU5472G7GTEGTF7P2/action/citation_signature","submit_replication":"https://pith.science/pith/XRIDZSKJGCU5472G7GTEGTF7P2/action/replication_record"}},"created_at":"2026-07-05T08:17:47.976433+00:00","updated_at":"2026-07-05T08:17:47.976433+00:00"}