{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:D4QWJXRSH6EFZR7Y4QZAVXH72W","short_pith_number":"pith:D4QWJXRS","canonical_record":{"source":{"id":"2105.11512","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"eess.IV","submitted_at":"2021-05-24T19:44:43Z","cross_cats_sorted":["cs.IT","math.IT","physics.optics","stat.AP"],"title_canon_sha256":"621f58bb605283c8d2bb1bf2871faa5e319a3ebb776a7e59f8ea6686e221a380","abstract_canon_sha256":"3d689e2f29852be27a9ceb4ff7822dd78e00aa8d81f6c29286e7a3044c5e1022"},"schema_version":"1.0"},"canonical_sha256":"1f2164de323f885cc7f8e4320adcffd5b0ebe8e12dfeb583b1f21e3ff460af8a","source":{"kind":"arxiv","id":"2105.11512","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2105.11512","created_at":"2026-07-05T03:57:40Z"},{"alias_kind":"arxiv_version","alias_value":"2105.11512v2","created_at":"2026-07-05T03:57:40Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2105.11512","created_at":"2026-07-05T03:57:40Z"},{"alias_kind":"pith_short_12","alias_value":"D4QWJXRSH6EF","created_at":"2026-07-05T03:57:40Z"},{"alias_kind":"pith_short_16","alias_value":"D4QWJXRSH6EFZR7Y","created_at":"2026-07-05T03:57:40Z"},{"alias_kind":"pith_short_8","alias_value":"D4QWJXRS","created_at":"2026-07-05T03:57:40Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:D4QWJXRSH6EFZR7Y4QZAVXH72W","target":"record","payload":{"canonical_record":{"source":{"id":"2105.11512","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"eess.IV","submitted_at":"2021-05-24T19:44:43Z","cross_cats_sorted":["cs.IT","math.IT","physics.optics","stat.AP"],"title_canon_sha256":"621f58bb605283c8d2bb1bf2871faa5e319a3ebb776a7e59f8ea6686e221a380","abstract_canon_sha256":"3d689e2f29852be27a9ceb4ff7822dd78e00aa8d81f6c29286e7a3044c5e1022"},"schema_version":"1.0"},"canonical_sha256":"1f2164de323f885cc7f8e4320adcffd5b0ebe8e12dfeb583b1f21e3ff460af8a","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T03:57:40.152741Z","signature_b64":"0fg/kr5w2ZacQThTnt8YJoqnTAddC5ZF6JkxYkCN6rgvsi6K8KXi1bFVl9iCfNIiv5CemaJOcct/h3ydTakGDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"1f2164de323f885cc7f8e4320adcffd5b0ebe8e12dfeb583b1f21e3ff460af8a","last_reissued_at":"2026-07-05T03:57:40.152279Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T03:57:40.152279Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2105.11512","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T03:57:40Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"itZ5Kwhh8/pjJh7e9yPqB9n4QPPkIhjiRLhv2h2Jyz8YlP/WIYoXFgECRXGgHwOjkluBxvnJZWMkPMy9NFWeAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-12T09:17:31.011627Z"},"content_sha256":"878edb593cad5f734ebc76755926b59c9c0be4401d80c54a08f928a173a69c6a","schema_version":"1.0","event_id":"sha256:878edb593cad5f734ebc76755926b59c9c0be4401d80c54a08f928a173a69c6a"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:D4QWJXRSH6EFZR7Y4QZAVXH72W","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Towards Low-Photon Nanoscale Imaging: Holographic Phase Retrieval via Maximum Likelihood Optimization","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["cs.IT","math.IT","physics.optics","stat.AP"],"primary_cat":"eess.IV","authors_text":"David A. Barmherzig, Ju Sun","submitted_at":"2021-05-24T19:44:43Z","abstract_excerpt":"A new algorithmic framework is presented for holographic phase retrieval via maximum likelihood optimization, which allows for practical and robust image reconstruction. This framework is especially well-suited for holographic coherent diffraction imaging in the \\textit{low-photon regime}, where data is highly corrupted by Poisson shot noise. Thus, this methodology provides a viable solution towards the advent of \\textit{low-photon nanoscale imaging}, which is a fundamental challenge facing the current state of imaging technologies. Practical optimization algorithms are derived and implemented"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2105.11512","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2105.11512/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-05T03:57:40Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"FBUjC3FuRzXRa7D9WpZsBoDNSt/pLiYXuzw109143zianlSyNJc7GnuZiBVmxQQAgJuzIPE2RnsjN3/poyDaCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-12T09:17:31.012693Z"},"content_sha256":"5d5e4400bc5ed0124fe49c19be609bdbc69370547a89c1748d55d5e60d766ad9","schema_version":"1.0","event_id":"sha256:5d5e4400bc5ed0124fe49c19be609bdbc69370547a89c1748d55d5e60d766ad9"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/D4QWJXRSH6EFZR7Y4QZAVXH72W/bundle.json","state_url":"https://pith.science/pith/D4QWJXRSH6EFZR7Y4QZAVXH72W/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/D4QWJXRSH6EFZR7Y4QZAVXH72W/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":"2026-08-12T09:17:31Z","links":{"resolver":"https://pith.science/pith/D4QWJXRSH6EFZR7Y4QZAVXH72W","bundle":"https://pith.science/pith/D4QWJXRSH6EFZR7Y4QZAVXH72W/bundle.json","state":"https://pith.science/pith/D4QWJXRSH6EFZR7Y4QZAVXH72W/state.json","well_known_bundle":"https://pith.science/.well-known/pith/D4QWJXRSH6EFZR7Y4QZAVXH72W/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:D4QWJXRSH6EFZR7Y4QZAVXH72W","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":"3d689e2f29852be27a9ceb4ff7822dd78e00aa8d81f6c29286e7a3044c5e1022","cross_cats_sorted":["cs.IT","math.IT","physics.optics","stat.AP"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"eess.IV","submitted_at":"2021-05-24T19:44:43Z","title_canon_sha256":"621f58bb605283c8d2bb1bf2871faa5e319a3ebb776a7e59f8ea6686e221a380"},"schema_version":"1.0","source":{"id":"2105.11512","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2105.11512","created_at":"2026-07-05T03:57:40Z"},{"alias_kind":"arxiv_version","alias_value":"2105.11512v2","created_at":"2026-07-05T03:57:40Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2105.11512","created_at":"2026-07-05T03:57:40Z"},{"alias_kind":"pith_short_12","alias_value":"D4QWJXRSH6EF","created_at":"2026-07-05T03:57:40Z"},{"alias_kind":"pith_short_16","alias_value":"D4QWJXRSH6EFZR7Y","created_at":"2026-07-05T03:57:40Z"},{"alias_kind":"pith_short_8","alias_value":"D4QWJXRS","created_at":"2026-07-05T03:57:40Z"}],"graph_snapshots":[{"event_id":"sha256:5d5e4400bc5ed0124fe49c19be609bdbc69370547a89c1748d55d5e60d766ad9","target":"graph","created_at":"2026-07-05T03:57:40Z","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/2105.11512/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"A new algorithmic framework is presented for holographic phase retrieval via maximum likelihood optimization, which allows for practical and robust image reconstruction. This framework is especially well-suited for holographic coherent diffraction imaging in the \\textit{low-photon regime}, where data is highly corrupted by Poisson shot noise. Thus, this methodology provides a viable solution towards the advent of \\textit{low-photon nanoscale imaging}, which is a fundamental challenge facing the current state of imaging technologies. Practical optimization algorithms are derived and implemented","authors_text":"David A. Barmherzig, Ju Sun","cross_cats":["cs.IT","math.IT","physics.optics","stat.AP"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"eess.IV","submitted_at":"2021-05-24T19:44:43Z","title":"Towards Low-Photon Nanoscale Imaging: Holographic Phase Retrieval via Maximum Likelihood Optimization"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2105.11512","kind":"arxiv","version":2},"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":"sha256:878edb593cad5f734ebc76755926b59c9c0be4401d80c54a08f928a173a69c6a","target":"record","created_at":"2026-07-05T03:57:40Z","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":"3d689e2f29852be27a9ceb4ff7822dd78e00aa8d81f6c29286e7a3044c5e1022","cross_cats_sorted":["cs.IT","math.IT","physics.optics","stat.AP"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"eess.IV","submitted_at":"2021-05-24T19:44:43Z","title_canon_sha256":"621f58bb605283c8d2bb1bf2871faa5e319a3ebb776a7e59f8ea6686e221a380"},"schema_version":"1.0","source":{"id":"2105.11512","kind":"arxiv","version":2}},"canonical_sha256":"1f2164de323f885cc7f8e4320adcffd5b0ebe8e12dfeb583b1f21e3ff460af8a","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"1f2164de323f885cc7f8e4320adcffd5b0ebe8e12dfeb583b1f21e3ff460af8a","first_computed_at":"2026-07-05T03:57:40.152279Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T03:57:40.152279Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"0fg/kr5w2ZacQThTnt8YJoqnTAddC5ZF6JkxYkCN6rgvsi6K8KXi1bFVl9iCfNIiv5CemaJOcct/h3ydTakGDg==","signature_status":"signed_v1","signed_at":"2026-07-05T03:57:40.152741Z","signed_message":"canonical_sha256_bytes"},"source_id":"2105.11512","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:878edb593cad5f734ebc76755926b59c9c0be4401d80c54a08f928a173a69c6a","sha256:5d5e4400bc5ed0124fe49c19be609bdbc69370547a89c1748d55d5e60d766ad9"],"state_sha256":"761c452e5dabf523a02ef9bcff22f69298cf06ed347ef400a88994e513abb62e"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"xbmwmMjdJ73VqXC9JPci59rZzGoEEiSi+aPY6rIcueTsCOhfKsNGHObdRMbXXhtNmCwjA3tF2iSUIPkyRdWwDg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-12T09:17:31.027947Z","bundle_sha256":"3cbdd716e25600fbedf129c39c79e4a1f621d9289621375d71a7b864d51eb7c2"}}