{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2017:OKNL2HXEBXKQY5DEA6N5E44X26","short_pith_number":"pith:OKNL2HXE","canonical_record":{"source":{"id":"1708.05708","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2017-08-18T17:53:01Z","cross_cats_sorted":["physics.optics"],"title_canon_sha256":"2dd8002a90244c293a2df681b4266ca408c0cf2f07e644ce15d52dbedec3df66","abstract_canon_sha256":"a18ac88d9891dec14c73355bb70f5e934998ee449b86b28e5fc0f85f5b0c4247"},"schema_version":"1.0"},"canonical_sha256":"729abd1ee40dd50c7464079bd27397d787518810cc2d1e43e905a2d798a3be9e","source":{"kind":"arxiv","id":"1708.05708","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1708.05708","created_at":"2026-05-18T00:37:49Z"},{"alias_kind":"arxiv_version","alias_value":"1708.05708v1","created_at":"2026-05-18T00:37:49Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1708.05708","created_at":"2026-05-18T00:37:49Z"},{"alias_kind":"pith_short_12","alias_value":"OKNL2HXEBXKQ","created_at":"2026-05-18T12:31:34Z"},{"alias_kind":"pith_short_16","alias_value":"OKNL2HXEBXKQY5DE","created_at":"2026-05-18T12:31:34Z"},{"alias_kind":"pith_short_8","alias_value":"OKNL2HXE","created_at":"2026-05-18T12:31:34Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2017:OKNL2HXEBXKQY5DEA6N5E44X26","target":"record","payload":{"canonical_record":{"source":{"id":"1708.05708","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2017-08-18T17:53:01Z","cross_cats_sorted":["physics.optics"],"title_canon_sha256":"2dd8002a90244c293a2df681b4266ca408c0cf2f07e644ce15d52dbedec3df66","abstract_canon_sha256":"a18ac88d9891dec14c73355bb70f5e934998ee449b86b28e5fc0f85f5b0c4247"},"schema_version":"1.0"},"canonical_sha256":"729abd1ee40dd50c7464079bd27397d787518810cc2d1e43e905a2d798a3be9e","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:37:49.283715Z","signature_b64":"shXuVxIUUObLe4GeM715VdeBHdPKWlAzCyCRM7/Xz3xl5lylEyiuQjPTdHrIKbTpAPRrUqSbJDPeTa73XJD3Ag==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"729abd1ee40dd50c7464079bd27397d787518810cc2d1e43e905a2d798a3be9e","last_reissued_at":"2026-05-18T00:37:49.283114Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:37:49.283114Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1708.05708","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":"2026-05-18T00:37:49Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"8CmXcDWkq74KevRmtJLIsDaKX7SgnCZ/xEG7170V/b52LW2mgVovY65ohe1BNy1Wn1UAMtAI5XnLzOC0d9oDDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-05T04:42:48.363065Z"},"content_sha256":"9ea5c94a1aa4b11266e53cafbce68f9a1e81ed6e12808ba7ba6a6956d1d313e0","schema_version":"1.0","event_id":"sha256:9ea5c94a1aa4b11266e53cafbce68f9a1e81ed6e12808ba7ba6a6956d1d313e0"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2017:OKNL2HXEBXKQY5DEA6N5E44X26","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Development of a Digital Astronomical Intensity Interferometer: laboratory tests with thermal light","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.optics"],"primary_cat":"astro-ph.IM","authors_text":"David Kieda, Nolan Matthews, Stephan LeBohec","submitted_at":"2017-08-18T17:53:01Z","abstract_excerpt":"We present measurements of the second order spatial coherence function of thermal light sources using Hanbury-Brown and Twiss interferometry with a digital correlator. We demonstrate that intensity fluctuations between orthogonal polarizations, or at detector separations greater than the spatial coherence length of the source, are uncorrelated but can be used to reduce systematic noise. The work performed here can readily be applied to existing and future Imaging Air-Cherenkov Telescopes used as star light collectors for Stellar Intensity Interferometry (SII) to measure spatial properties of a"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1708.05708","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":"2026-05-18T00:37:49Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"lVIHGm+4pwFTzpirlNEdwRu7u3rNfdHaGqOx0JaBZehtFKv9Barurlv2SM7D3elz710plTn+cfRwq7FX4/yrCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-05T04:42:48.363627Z"},"content_sha256":"bb14f28e811734c52fa26d8faf9168e17ce3d1ecccb4fbbf42148752cacf21ad","schema_version":"1.0","event_id":"sha256:bb14f28e811734c52fa26d8faf9168e17ce3d1ecccb4fbbf42148752cacf21ad"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/OKNL2HXEBXKQY5DEA6N5E44X26/bundle.json","state_url":"https://pith.science/pith/OKNL2HXEBXKQY5DEA6N5E44X26/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/OKNL2HXEBXKQY5DEA6N5E44X26/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":"2026-06-05T04:42:48Z","links":{"resolver":"https://pith.science/pith/OKNL2HXEBXKQY5DEA6N5E44X26","bundle":"https://pith.science/pith/OKNL2HXEBXKQY5DEA6N5E44X26/bundle.json","state":"https://pith.science/pith/OKNL2HXEBXKQY5DEA6N5E44X26/state.json","well_known_bundle":"https://pith.science/.well-known/pith/OKNL2HXEBXKQY5DEA6N5E44X26/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:OKNL2HXEBXKQY5DEA6N5E44X26","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":"a18ac88d9891dec14c73355bb70f5e934998ee449b86b28e5fc0f85f5b0c4247","cross_cats_sorted":["physics.optics"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2017-08-18T17:53:01Z","title_canon_sha256":"2dd8002a90244c293a2df681b4266ca408c0cf2f07e644ce15d52dbedec3df66"},"schema_version":"1.0","source":{"id":"1708.05708","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1708.05708","created_at":"2026-05-18T00:37:49Z"},{"alias_kind":"arxiv_version","alias_value":"1708.05708v1","created_at":"2026-05-18T00:37:49Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1708.05708","created_at":"2026-05-18T00:37:49Z"},{"alias_kind":"pith_short_12","alias_value":"OKNL2HXEBXKQ","created_at":"2026-05-18T12:31:34Z"},{"alias_kind":"pith_short_16","alias_value":"OKNL2HXEBXKQY5DE","created_at":"2026-05-18T12:31:34Z"},{"alias_kind":"pith_short_8","alias_value":"OKNL2HXE","created_at":"2026-05-18T12:31:34Z"}],"graph_snapshots":[{"event_id":"sha256:bb14f28e811734c52fa26d8faf9168e17ce3d1ecccb4fbbf42148752cacf21ad","target":"graph","created_at":"2026-05-18T00:37:49Z","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 present measurements of the second order spatial coherence function of thermal light sources using Hanbury-Brown and Twiss interferometry with a digital correlator. We demonstrate that intensity fluctuations between orthogonal polarizations, or at detector separations greater than the spatial coherence length of the source, are uncorrelated but can be used to reduce systematic noise. The work performed here can readily be applied to existing and future Imaging Air-Cherenkov Telescopes used as star light collectors for Stellar Intensity Interferometry (SII) to measure spatial properties of a","authors_text":"David Kieda, Nolan Matthews, Stephan LeBohec","cross_cats":["physics.optics"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2017-08-18T17:53:01Z","title":"Development of a Digital Astronomical Intensity Interferometer: laboratory tests with thermal light"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1708.05708","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":"sha256:9ea5c94a1aa4b11266e53cafbce68f9a1e81ed6e12808ba7ba6a6956d1d313e0","target":"record","created_at":"2026-05-18T00:37:49Z","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":"a18ac88d9891dec14c73355bb70f5e934998ee449b86b28e5fc0f85f5b0c4247","cross_cats_sorted":["physics.optics"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2017-08-18T17:53:01Z","title_canon_sha256":"2dd8002a90244c293a2df681b4266ca408c0cf2f07e644ce15d52dbedec3df66"},"schema_version":"1.0","source":{"id":"1708.05708","kind":"arxiv","version":1}},"canonical_sha256":"729abd1ee40dd50c7464079bd27397d787518810cc2d1e43e905a2d798a3be9e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"729abd1ee40dd50c7464079bd27397d787518810cc2d1e43e905a2d798a3be9e","first_computed_at":"2026-05-18T00:37:49.283114Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:37:49.283114Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"shXuVxIUUObLe4GeM715VdeBHdPKWlAzCyCRM7/Xz3xl5lylEyiuQjPTdHrIKbTpAPRrUqSbJDPeTa73XJD3Ag==","signature_status":"signed_v1","signed_at":"2026-05-18T00:37:49.283715Z","signed_message":"canonical_sha256_bytes"},"source_id":"1708.05708","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:9ea5c94a1aa4b11266e53cafbce68f9a1e81ed6e12808ba7ba6a6956d1d313e0","sha256:bb14f28e811734c52fa26d8faf9168e17ce3d1ecccb4fbbf42148752cacf21ad"],"state_sha256":"1c88c436a9bba6c332576b3839ae4122a83ef26e3c92c1532c8a776bee722792"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"cwmElK4TJP6lcr/s6WzkCLmut1FfjDH8RiWcK/SirZhYV0SkchQUOPaDEdS86WDF+rDAzd7zGau2UA8UBgP5Ag==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-05T04:42:48.366483Z","bundle_sha256":"b389a370472be16af2d142a5b5231e9ae1c33f1fa9f58dd158a5f48f7d44744c"}}