{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:XO4AGSBLMMWF5PDOGBIEMDMN6P","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":"3acc210ae4719692c8aafff51839fb4bb0aab756d7ade9ec3e1173f9e5f909d3","cross_cats_sorted":["physics.ins-det","physics.optics"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2019-06-05T19:07:21Z","title_canon_sha256":"ac7438389d26696c5036a2cac83d2d01b2c9cfbe79b87482477566795dc14a4d"},"schema_version":"1.0","source":{"id":"1906.02258","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1906.02258","created_at":"2026-07-05T00:36:25Z"},{"alias_kind":"arxiv_version","alias_value":"1906.02258v1","created_at":"2026-07-05T00:36:25Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1906.02258","created_at":"2026-07-05T00:36:25Z"},{"alias_kind":"pith_short_12","alias_value":"XO4AGSBLMMWF","created_at":"2026-07-05T00:36:25Z"},{"alias_kind":"pith_short_16","alias_value":"XO4AGSBLMMWF5PDO","created_at":"2026-07-05T00:36:25Z"},{"alias_kind":"pith_short_8","alias_value":"XO4AGSBL","created_at":"2026-07-05T00:36:25Z"}],"graph_snapshots":[{"event_id":"sha256:99ea3556979c8dfd05b0e00284a34b3b3d6cb018264d915ffea2a63f819c7adb","target":"graph","created_at":"2026-07-05T00:36:25Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/1906.02258/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We measure the detection efficiency of single-photon detectors at wavelengths near 851 nm and 1533.6 nm. We investigate the spatial uniformity of one free-space-coupled single-photon avalanche diode and present a comparison between fusion-spliced and connectorized fiber-coupled single-photon detectors. We find that our expanded relative uncertainty for a single measurement of the detection efficiency is as low as 0.70 % for fiber-coupled measurements at 1533.6 nm and as high as 1.78 % for our free-space characterization at 851.7 nm. The detection-efficiency determination includes corrections f","authors_text":"Alan Migdall, Igor Vayshenker, Jack Wang, John Lehman, Jolene Splett, Joshua C. Bienfang, Sae Woo Nam, Thomas Gerrits","cross_cats":["physics.ins-det","physics.optics"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2019-06-05T19:07:21Z","title":"Calibration of free-space and fiber-coupled single-photon detectors"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1906.02258","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:c8eb45d55d26b3d5729dc79ab65c92c4b600af059d9608b3ec1b755d48a9aa05","target":"record","created_at":"2026-07-05T00:36:25Z","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":"3acc210ae4719692c8aafff51839fb4bb0aab756d7ade9ec3e1173f9e5f909d3","cross_cats_sorted":["physics.ins-det","physics.optics"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2019-06-05T19:07:21Z","title_canon_sha256":"ac7438389d26696c5036a2cac83d2d01b2c9cfbe79b87482477566795dc14a4d"},"schema_version":"1.0","source":{"id":"1906.02258","kind":"arxiv","version":1}},"canonical_sha256":"bbb803482b632c5ebc6e3050460d8df3f082bbcb58b9af885d67ae86de163f4f","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"bbb803482b632c5ebc6e3050460d8df3f082bbcb58b9af885d67ae86de163f4f","first_computed_at":"2026-07-05T00:36:25.527120Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T00:36:25.527120Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"t8yrLMr3+aE01UqoU/sibraL5+2HAc4GpSd7WWONoBwMAELNna6Te7zcwsOK3ZIUAgP9Pxdmedp3nGl5h5FDBA==","signature_status":"signed_v1","signed_at":"2026-07-05T00:36:25.527647Z","signed_message":"canonical_sha256_bytes"},"source_id":"1906.02258","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c8eb45d55d26b3d5729dc79ab65c92c4b600af059d9608b3ec1b755d48a9aa05","sha256:99ea3556979c8dfd05b0e00284a34b3b3d6cb018264d915ffea2a63f819c7adb"],"state_sha256":"745dbe1c6fc336b190a1fc7cf5f6b746b57db0d8310318e9b6199750c590aa49"}