{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:HDYBU36KOBK5IDZT65CNKP56FE","short_pith_number":"pith:HDYBU36K","canonical_record":{"source":{"id":"1512.01020","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2015-12-03T10:10:43Z","cross_cats_sorted":[],"title_canon_sha256":"6c61a27231fb10a64194f490976b3c3dc79cfce7ece791e17eef166d20e3b535","abstract_canon_sha256":"312f6df7891663a134f14244ff573d295192a2021f8d36aad995c402fc8cb931"},"schema_version":"1.0"},"canonical_sha256":"38f01a6fca7055d40f33f744d53fbe292efa437384f60cb5980ebbcae4bb6816","source":{"kind":"arxiv","id":"1512.01020","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1512.01020","created_at":"2026-05-18T01:21:36Z"},{"alias_kind":"arxiv_version","alias_value":"1512.01020v1","created_at":"2026-05-18T01:21:36Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1512.01020","created_at":"2026-05-18T01:21:36Z"},{"alias_kind":"pith_short_12","alias_value":"HDYBU36KOBK5","created_at":"2026-05-18T12:29:25Z"},{"alias_kind":"pith_short_16","alias_value":"HDYBU36KOBK5IDZT","created_at":"2026-05-18T12:29:25Z"},{"alias_kind":"pith_short_8","alias_value":"HDYBU36K","created_at":"2026-05-18T12:29:25Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:HDYBU36KOBK5IDZT65CNKP56FE","target":"record","payload":{"canonical_record":{"source":{"id":"1512.01020","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2015-12-03T10:10:43Z","cross_cats_sorted":[],"title_canon_sha256":"6c61a27231fb10a64194f490976b3c3dc79cfce7ece791e17eef166d20e3b535","abstract_canon_sha256":"312f6df7891663a134f14244ff573d295192a2021f8d36aad995c402fc8cb931"},"schema_version":"1.0"},"canonical_sha256":"38f01a6fca7055d40f33f744d53fbe292efa437384f60cb5980ebbcae4bb6816","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:21:36.724184Z","signature_b64":"siACLid+0B9j45JUlSIyGiKrhGUSTU7WDh6UGcTX9Z++9CmstpoWb5YEtBtSbUa6NSHB8ekXCU6LiWg21d0/DQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"38f01a6fca7055d40f33f744d53fbe292efa437384f60cb5980ebbcae4bb6816","last_reissued_at":"2026-05-18T01:21:36.723530Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:21:36.723530Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1512.01020","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:21:36Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"6CDxMUfmDHVr4drbw+jv2LDSs8Zj+ogC05ZY0uw/novcgARezEuvPowitj6RMRLL8sq8oIEYwopaIJhcW5NiAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-23T17:29:38.084254Z"},"content_sha256":"05ff82c212a8c5da22efcf5fe8dd66041480b33133d86e53c2dc8cb840f0a898","schema_version":"1.0","event_id":"sha256:05ff82c212a8c5da22efcf5fe8dd66041480b33133d86e53c2dc8cb840f0a898"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:HDYBU36KOBK5IDZT65CNKP56FE","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Heralded single photon sources for QKD applications","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"F. Ticozzi, G. Vallone, M. Schiavon, P. Villoresi","submitted_at":"2015-12-03T10:10:43Z","abstract_excerpt":"Single photon sources (SPS) are a fundamental building block for optical implementations of quantum information protocols. Among SPSs, multiple crystal heralded single photon sources seem to give the best compromise between high pair production rate and low multiple photon events. In this work, we study their performance in a practical quantum key distribution experiment, by evaluating the achievable key rates. The analysis focuses on the two different schemes, symmetric and asymmetric, proposed for the practical implementation of heralded single photon sources, with attention on the performan"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1512.01020","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":""},"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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:21:36Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"C/oT5TMBZPdx+AVOhPyY2HpujFaLb7n+/UoeAuVxopntzyL5lTT/+5mQMspnPj2//pyDWIAKX8F23zPNO5FbBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-23T17:29:38.084914Z"},"content_sha256":"a9c3e0d59b80df4b1d61c0480edbe5d2208fcc0eb668ac3f553e7f4a5efc5cf2","schema_version":"1.0","event_id":"sha256:a9c3e0d59b80df4b1d61c0480edbe5d2208fcc0eb668ac3f553e7f4a5efc5cf2"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/HDYBU36KOBK5IDZT65CNKP56FE/bundle.json","state_url":"https://pith.science/pith/HDYBU36KOBK5IDZT65CNKP56FE/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/HDYBU36KOBK5IDZT65CNKP56FE/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-05-23T17:29:38Z","links":{"resolver":"https://pith.science/pith/HDYBU36KOBK5IDZT65CNKP56FE","bundle":"https://pith.science/pith/HDYBU36KOBK5IDZT65CNKP56FE/bundle.json","state":"https://pith.science/pith/HDYBU36KOBK5IDZT65CNKP56FE/state.json","well_known_bundle":"https://pith.science/.well-known/pith/HDYBU36KOBK5IDZT65CNKP56FE/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:HDYBU36KOBK5IDZT65CNKP56FE","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":"312f6df7891663a134f14244ff573d295192a2021f8d36aad995c402fc8cb931","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2015-12-03T10:10:43Z","title_canon_sha256":"6c61a27231fb10a64194f490976b3c3dc79cfce7ece791e17eef166d20e3b535"},"schema_version":"1.0","source":{"id":"1512.01020","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1512.01020","created_at":"2026-05-18T01:21:36Z"},{"alias_kind":"arxiv_version","alias_value":"1512.01020v1","created_at":"2026-05-18T01:21:36Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1512.01020","created_at":"2026-05-18T01:21:36Z"},{"alias_kind":"pith_short_12","alias_value":"HDYBU36KOBK5","created_at":"2026-05-18T12:29:25Z"},{"alias_kind":"pith_short_16","alias_value":"HDYBU36KOBK5IDZT","created_at":"2026-05-18T12:29:25Z"},{"alias_kind":"pith_short_8","alias_value":"HDYBU36K","created_at":"2026-05-18T12:29:25Z"}],"graph_snapshots":[{"event_id":"sha256:a9c3e0d59b80df4b1d61c0480edbe5d2208fcc0eb668ac3f553e7f4a5efc5cf2","target":"graph","created_at":"2026-05-18T01:21:36Z","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":"Single photon sources (SPS) are a fundamental building block for optical implementations of quantum information protocols. Among SPSs, multiple crystal heralded single photon sources seem to give the best compromise between high pair production rate and low multiple photon events. In this work, we study their performance in a practical quantum key distribution experiment, by evaluating the achievable key rates. The analysis focuses on the two different schemes, symmetric and asymmetric, proposed for the practical implementation of heralded single photon sources, with attention on the performan","authors_text":"F. Ticozzi, G. Vallone, M. Schiavon, P. Villoresi","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2015-12-03T10:10:43Z","title":"Heralded single photon sources for QKD applications"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1512.01020","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":"sha256:05ff82c212a8c5da22efcf5fe8dd66041480b33133d86e53c2dc8cb840f0a898","target":"record","created_at":"2026-05-18T01:21:36Z","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":"312f6df7891663a134f14244ff573d295192a2021f8d36aad995c402fc8cb931","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2015-12-03T10:10:43Z","title_canon_sha256":"6c61a27231fb10a64194f490976b3c3dc79cfce7ece791e17eef166d20e3b535"},"schema_version":"1.0","source":{"id":"1512.01020","kind":"arxiv","version":1}},"canonical_sha256":"38f01a6fca7055d40f33f744d53fbe292efa437384f60cb5980ebbcae4bb6816","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"38f01a6fca7055d40f33f744d53fbe292efa437384f60cb5980ebbcae4bb6816","first_computed_at":"2026-05-18T01:21:36.723530Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:21:36.723530Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"siACLid+0B9j45JUlSIyGiKrhGUSTU7WDh6UGcTX9Z++9CmstpoWb5YEtBtSbUa6NSHB8ekXCU6LiWg21d0/DQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:21:36.724184Z","signed_message":"canonical_sha256_bytes"},"source_id":"1512.01020","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:05ff82c212a8c5da22efcf5fe8dd66041480b33133d86e53c2dc8cb840f0a898","sha256:a9c3e0d59b80df4b1d61c0480edbe5d2208fcc0eb668ac3f553e7f4a5efc5cf2"],"state_sha256":"ea04da0914eebaca3c14ed8e64c89eedb2b7aa4515acf09d14420ed6464959d7"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"jOrs4/Ih6VIEnr7B5oxQJAaI0Oiyvh3Ds6A1Aj4Xenuognkgw4Bf7h1pDycsEyOW0oVr4rNsBuenrYRVj6W2BA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-23T17:29:38.088191Z","bundle_sha256":"c51cadb6115c15f566b407c6e667010f0aa15e492fbc870f4b046f79a6be236f"}}