{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:L4XUTRAH3YFSU3CBNKLP6PRYK2","short_pith_number":"pith:L4XUTRAH","canonical_record":{"source":{"id":"1801.10535","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2018-01-31T16:40:22Z","cross_cats_sorted":["quant-ph"],"title_canon_sha256":"e4a2a5db947e4307179a46c07aca976d1b6f6bf7a037b22ffaa8ce66850aa375","abstract_canon_sha256":"e379582913ef859da540a0631583eba927ed0ef5c0dcce326928a500101aed7c"},"schema_version":"1.0"},"canonical_sha256":"5f2f49c407de0b2a6c416a96ff3e3856b452b551d8cfb2cf56a69807d4c96213","source":{"kind":"arxiv","id":"1801.10535","version":3},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1801.10535","created_at":"2026-05-18T00:01:19Z"},{"alias_kind":"arxiv_version","alias_value":"1801.10535v3","created_at":"2026-05-18T00:01:19Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1801.10535","created_at":"2026-05-18T00:01:19Z"},{"alias_kind":"pith_short_12","alias_value":"L4XUTRAH3YFS","created_at":"2026-05-18T12:32:33Z"},{"alias_kind":"pith_short_16","alias_value":"L4XUTRAH3YFSU3CB","created_at":"2026-05-18T12:32:33Z"},{"alias_kind":"pith_short_8","alias_value":"L4XUTRAH","created_at":"2026-05-18T12:32:33Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:L4XUTRAH3YFSU3CBNKLP6PRYK2","target":"record","payload":{"canonical_record":{"source":{"id":"1801.10535","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2018-01-31T16:40:22Z","cross_cats_sorted":["quant-ph"],"title_canon_sha256":"e4a2a5db947e4307179a46c07aca976d1b6f6bf7a037b22ffaa8ce66850aa375","abstract_canon_sha256":"e379582913ef859da540a0631583eba927ed0ef5c0dcce326928a500101aed7c"},"schema_version":"1.0"},"canonical_sha256":"5f2f49c407de0b2a6c416a96ff3e3856b452b551d8cfb2cf56a69807d4c96213","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:01:19.665991Z","signature_b64":"ll5SykvAsYN/VXhuO/F9V74OYlHf9vTbjNMn3eh1BVf2Cm60rfxqXMNFdKI0wBrrylXsv+wuhwOP8FwIeW/sCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"5f2f49c407de0b2a6c416a96ff3e3856b452b551d8cfb2cf56a69807d4c96213","last_reissued_at":"2026-05-18T00:01:19.665451Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:01:19.665451Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1801.10535","source_version":3,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:01:19Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"NFs/X1NvnrvCjKYGbF+BhjJFlDtYirMZkV0c6e55MYI0lZmfvJYHvRVvO9KIf7HWvTRQYD8ldiEpYC5m/OYRAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-24T14:32:23.849271Z"},"content_sha256":"726b46da94deda4eb39b6381ed07e9ceea5a78efe7c4336d2f21ae4a9c37312f","schema_version":"1.0","event_id":"sha256:726b46da94deda4eb39b6381ed07e9ceea5a78efe7c4336d2f21ae4a9c37312f"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:L4XUTRAH3YFSU3CBNKLP6PRYK2","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Comparison of coherence area measurement techniques for bright entangled twin beams","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["quant-ph"],"primary_cat":"physics.optics","authors_text":"Alberto M. Marino, Ashok Kumar, Hayden Nunley","submitted_at":"2018-01-31T16:40:22Z","abstract_excerpt":"Quantum states of light with multiple spatial modes are fundamental for quantum imaging and parallel quantum information processing. Thus, their characterization, which can be achieved through measurements of the coherence area, is an important area of research. We present a comparative study between two different measurement techniques for the coherence area of bright entangled twin beams of light generated with a four-wave mixing process in a hot rubidium vapor cell. The first one provides a direct characterization of the size of the coherence area and is based on correlation measurements be"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1801.10535","kind":"arxiv","version":3},"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":"2026-05-18T00:01:19Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"QLe8nkobFOS1UD4rsmZAFuRdcGElILYEZIRs2lmGvS3LbWAp2zYuZBocAOH0Wt8mwwHGeGlYczrH+lPDOVI5Ag==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-24T14:32:23.849638Z"},"content_sha256":"8f5ad0690cd71e8e53617c29c7bd62db7fd97d6fe960d98d1e6a3b4b456f8f9a","schema_version":"1.0","event_id":"sha256:8f5ad0690cd71e8e53617c29c7bd62db7fd97d6fe960d98d1e6a3b4b456f8f9a"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/L4XUTRAH3YFSU3CBNKLP6PRYK2/bundle.json","state_url":"https://pith.science/pith/L4XUTRAH3YFSU3CBNKLP6PRYK2/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/L4XUTRAH3YFSU3CBNKLP6PRYK2/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":"2026-06-24T14:32:23Z","links":{"resolver":"https://pith.science/pith/L4XUTRAH3YFSU3CBNKLP6PRYK2","bundle":"https://pith.science/pith/L4XUTRAH3YFSU3CBNKLP6PRYK2/bundle.json","state":"https://pith.science/pith/L4XUTRAH3YFSU3CBNKLP6PRYK2/state.json","well_known_bundle":"https://pith.science/.well-known/pith/L4XUTRAH3YFSU3CBNKLP6PRYK2/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:L4XUTRAH3YFSU3CBNKLP6PRYK2","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":"e379582913ef859da540a0631583eba927ed0ef5c0dcce326928a500101aed7c","cross_cats_sorted":["quant-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2018-01-31T16:40:22Z","title_canon_sha256":"e4a2a5db947e4307179a46c07aca976d1b6f6bf7a037b22ffaa8ce66850aa375"},"schema_version":"1.0","source":{"id":"1801.10535","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1801.10535","created_at":"2026-05-18T00:01:19Z"},{"alias_kind":"arxiv_version","alias_value":"1801.10535v3","created_at":"2026-05-18T00:01:19Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1801.10535","created_at":"2026-05-18T00:01:19Z"},{"alias_kind":"pith_short_12","alias_value":"L4XUTRAH3YFS","created_at":"2026-05-18T12:32:33Z"},{"alias_kind":"pith_short_16","alias_value":"L4XUTRAH3YFSU3CB","created_at":"2026-05-18T12:32:33Z"},{"alias_kind":"pith_short_8","alias_value":"L4XUTRAH","created_at":"2026-05-18T12:32:33Z"}],"graph_snapshots":[{"event_id":"sha256:8f5ad0690cd71e8e53617c29c7bd62db7fd97d6fe960d98d1e6a3b4b456f8f9a","target":"graph","created_at":"2026-05-18T00:01:19Z","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":"Quantum states of light with multiple spatial modes are fundamental for quantum imaging and parallel quantum information processing. Thus, their characterization, which can be achieved through measurements of the coherence area, is an important area of research. We present a comparative study between two different measurement techniques for the coherence area of bright entangled twin beams of light generated with a four-wave mixing process in a hot rubidium vapor cell. The first one provides a direct characterization of the size of the coherence area and is based on correlation measurements be","authors_text":"Alberto M. Marino, Ashok Kumar, Hayden Nunley","cross_cats":["quant-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2018-01-31T16:40:22Z","title":"Comparison of coherence area measurement techniques for bright entangled twin beams"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1801.10535","kind":"arxiv","version":3},"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":"sha256:726b46da94deda4eb39b6381ed07e9ceea5a78efe7c4336d2f21ae4a9c37312f","target":"record","created_at":"2026-05-18T00:01:19Z","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":"e379582913ef859da540a0631583eba927ed0ef5c0dcce326928a500101aed7c","cross_cats_sorted":["quant-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2018-01-31T16:40:22Z","title_canon_sha256":"e4a2a5db947e4307179a46c07aca976d1b6f6bf7a037b22ffaa8ce66850aa375"},"schema_version":"1.0","source":{"id":"1801.10535","kind":"arxiv","version":3}},"canonical_sha256":"5f2f49c407de0b2a6c416a96ff3e3856b452b551d8cfb2cf56a69807d4c96213","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"5f2f49c407de0b2a6c416a96ff3e3856b452b551d8cfb2cf56a69807d4c96213","first_computed_at":"2026-05-18T00:01:19.665451Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:01:19.665451Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"ll5SykvAsYN/VXhuO/F9V74OYlHf9vTbjNMn3eh1BVf2Cm60rfxqXMNFdKI0wBrrylXsv+wuhwOP8FwIeW/sCg==","signature_status":"signed_v1","signed_at":"2026-05-18T00:01:19.665991Z","signed_message":"canonical_sha256_bytes"},"source_id":"1801.10535","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:726b46da94deda4eb39b6381ed07e9ceea5a78efe7c4336d2f21ae4a9c37312f","sha256:8f5ad0690cd71e8e53617c29c7bd62db7fd97d6fe960d98d1e6a3b4b456f8f9a"],"state_sha256":"a6601d1f45bb4f25e463a3701ac5c382c385ba990968a12fc12ae3116bbc12cc"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"N/ilMGVRTm117sCo3FEsywvTcr/U/ZNHiZo7NQjoByAMT2mnrjAXLQS//JklaXcHlVFRmLrsv/uu0r+k/FlVCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-24T14:32:23.851901Z","bundle_sha256":"a97eeb6506d297682cea976543b068784ff8ff1dde029f86a9570a2266f83725"}}