{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2014:AABISA54BIORUSO446PEI7I7DK","short_pith_number":"pith:AABISA54","canonical_record":{"source":{"id":"1403.6740","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2014-03-26T16:37:40Z","cross_cats_sorted":[],"title_canon_sha256":"082ddd44acf895811d571247965e9639b01749e35502bb6581d8f1cedc2422ea","abstract_canon_sha256":"cf5be34d2e72edeec3a74355a9f60671d6c2843c5df4c45aef69b7055abf8170"},"schema_version":"1.0"},"canonical_sha256":"00028903bc0a1d1a49dce79e447d1f1ab5624c139e8623c9a3bfbc641db2d5ee","source":{"kind":"arxiv","id":"1403.6740","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1403.6740","created_at":"2026-05-18T01:43:50Z"},{"alias_kind":"arxiv_version","alias_value":"1403.6740v1","created_at":"2026-05-18T01:43:50Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1403.6740","created_at":"2026-05-18T01:43:50Z"},{"alias_kind":"pith_short_12","alias_value":"AABISA54BIOR","created_at":"2026-05-18T12:28:19Z"},{"alias_kind":"pith_short_16","alias_value":"AABISA54BIORUSO4","created_at":"2026-05-18T12:28:19Z"},{"alias_kind":"pith_short_8","alias_value":"AABISA54","created_at":"2026-05-18T12:28:19Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2014:AABISA54BIORUSO446PEI7I7DK","target":"record","payload":{"canonical_record":{"source":{"id":"1403.6740","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2014-03-26T16:37:40Z","cross_cats_sorted":[],"title_canon_sha256":"082ddd44acf895811d571247965e9639b01749e35502bb6581d8f1cedc2422ea","abstract_canon_sha256":"cf5be34d2e72edeec3a74355a9f60671d6c2843c5df4c45aef69b7055abf8170"},"schema_version":"1.0"},"canonical_sha256":"00028903bc0a1d1a49dce79e447d1f1ab5624c139e8623c9a3bfbc641db2d5ee","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:43:50.771464Z","signature_b64":"eTClH+OOHXgSLfFqIGnXmw3SN5CP6D/x66jgIl1IK1RKo1a390LTJqvDWAKbvAjFlsYMuFRTLBQFVK2vbJ8VCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"00028903bc0a1d1a49dce79e447d1f1ab5624c139e8623c9a3bfbc641db2d5ee","last_reissued_at":"2026-05-18T01:43:50.770769Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:43:50.770769Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1403.6740","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":"2026-05-18T01:43:50Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Jjfa0dTOgZRttmuhu3pe9Btu4MS0zZq57GM/8DFYMh+H++FudWoW+Skg+791vnFB9LgPV+5N/K9xdYA+LVA+BA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-02T12:15:13.894801Z"},"content_sha256":"9c17686fa464e4f736d6371c5f94ab7ed4f124ad8ec277cab3f5a658ac1eb05d","schema_version":"1.0","event_id":"sha256:9c17686fa464e4f736d6371c5f94ab7ed4f124ad8ec277cab3f5a658ac1eb05d"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2014:AABISA54BIORUSO446PEI7I7DK","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Pulsed source of spectrally uncorrelated and indistinguishable photons at telecom wavelengths","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Anthony Martin, Bruno Sanguinetti, Natalia Bruno, Robert T. Thew, Thiago Guerreiro","submitted_at":"2014-03-26T16:37:40Z","abstract_excerpt":"We report on the generation of indistinguishable photon pairs at telecom wavelengths based on a type-II parametric down conversion process in a periodically poled potassium titanyl phosphate (PPKTP) crystal. The phase matching, pump laser characteristics and coupling geometry are optimised to obtain spectrally uncorrelated photons with high coupling efficiencies. Four photons are generated by a counter- propagating pump in the same crystal and anlysed via two photon interference experiments between photons from each pair source as well as joint spectral and g^(2) measurements. We obtain a spec"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1403.6740","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":"2026-05-18T01:43:50Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"le88MNCIqJOMqFQSbzDVqfSYVKIrisgUjdFAAYDrhJIwuDBzs24Ww5PD/4bUV7SROqjM4K2zjliU/IJiDtWXBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-02T12:15:13.895145Z"},"content_sha256":"5da4753894a272c1d360e3111b3e4d2279a4e2a443669f239986f366b2be60dd","schema_version":"1.0","event_id":"sha256:5da4753894a272c1d360e3111b3e4d2279a4e2a443669f239986f366b2be60dd"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/AABISA54BIORUSO446PEI7I7DK/bundle.json","state_url":"https://pith.science/pith/AABISA54BIORUSO446PEI7I7DK/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/AABISA54BIORUSO446PEI7I7DK/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":"2026-07-02T12:15:13Z","links":{"resolver":"https://pith.science/pith/AABISA54BIORUSO446PEI7I7DK","bundle":"https://pith.science/pith/AABISA54BIORUSO446PEI7I7DK/bundle.json","state":"https://pith.science/pith/AABISA54BIORUSO446PEI7I7DK/state.json","well_known_bundle":"https://pith.science/.well-known/pith/AABISA54BIORUSO446PEI7I7DK/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:AABISA54BIORUSO446PEI7I7DK","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":"cf5be34d2e72edeec3a74355a9f60671d6c2843c5df4c45aef69b7055abf8170","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2014-03-26T16:37:40Z","title_canon_sha256":"082ddd44acf895811d571247965e9639b01749e35502bb6581d8f1cedc2422ea"},"schema_version":"1.0","source":{"id":"1403.6740","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1403.6740","created_at":"2026-05-18T01:43:50Z"},{"alias_kind":"arxiv_version","alias_value":"1403.6740v1","created_at":"2026-05-18T01:43:50Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1403.6740","created_at":"2026-05-18T01:43:50Z"},{"alias_kind":"pith_short_12","alias_value":"AABISA54BIOR","created_at":"2026-05-18T12:28:19Z"},{"alias_kind":"pith_short_16","alias_value":"AABISA54BIORUSO4","created_at":"2026-05-18T12:28:19Z"},{"alias_kind":"pith_short_8","alias_value":"AABISA54","created_at":"2026-05-18T12:28:19Z"}],"graph_snapshots":[{"event_id":"sha256:5da4753894a272c1d360e3111b3e4d2279a4e2a443669f239986f366b2be60dd","target":"graph","created_at":"2026-05-18T01:43:50Z","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 report on the generation of indistinguishable photon pairs at telecom wavelengths based on a type-II parametric down conversion process in a periodically poled potassium titanyl phosphate (PPKTP) crystal. The phase matching, pump laser characteristics and coupling geometry are optimised to obtain spectrally uncorrelated photons with high coupling efficiencies. Four photons are generated by a counter- propagating pump in the same crystal and anlysed via two photon interference experiments between photons from each pair source as well as joint spectral and g^(2) measurements. We obtain a spec","authors_text":"Anthony Martin, Bruno Sanguinetti, Natalia Bruno, Robert T. Thew, Thiago Guerreiro","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2014-03-26T16:37:40Z","title":"Pulsed source of spectrally uncorrelated and indistinguishable photons at telecom wavelengths"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1403.6740","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":"sha256:9c17686fa464e4f736d6371c5f94ab7ed4f124ad8ec277cab3f5a658ac1eb05d","target":"record","created_at":"2026-05-18T01:43:50Z","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":"cf5be34d2e72edeec3a74355a9f60671d6c2843c5df4c45aef69b7055abf8170","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2014-03-26T16:37:40Z","title_canon_sha256":"082ddd44acf895811d571247965e9639b01749e35502bb6581d8f1cedc2422ea"},"schema_version":"1.0","source":{"id":"1403.6740","kind":"arxiv","version":1}},"canonical_sha256":"00028903bc0a1d1a49dce79e447d1f1ab5624c139e8623c9a3bfbc641db2d5ee","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"00028903bc0a1d1a49dce79e447d1f1ab5624c139e8623c9a3bfbc641db2d5ee","first_computed_at":"2026-05-18T01:43:50.770769Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:43:50.770769Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"eTClH+OOHXgSLfFqIGnXmw3SN5CP6D/x66jgIl1IK1RKo1a390LTJqvDWAKbvAjFlsYMuFRTLBQFVK2vbJ8VCw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:43:50.771464Z","signed_message":"canonical_sha256_bytes"},"source_id":"1403.6740","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:9c17686fa464e4f736d6371c5f94ab7ed4f124ad8ec277cab3f5a658ac1eb05d","sha256:5da4753894a272c1d360e3111b3e4d2279a4e2a443669f239986f366b2be60dd"],"state_sha256":"e3ac915d1415465d2fcde01aafccfc88314d082de9cb6afa5a20dea6f3897564"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"oYOafJMoKX+6iZXgAiYQBIDAr8yhmwiKJ6M7SDMhnYmByC8VNyIpOuI0DG/CazO6FeUEemBHIwbFokXrHhDLBg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-02T12:15:13.897055Z","bundle_sha256":"db530fd969bf3d52adb1b8d52df7119503b2b1f0e60d6c7a701cc7b2455464d3"}}