{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:HAOIDWGPOCUBBR4S72OHZPFPTZ","short_pith_number":"pith:HAOIDWGP","canonical_record":{"source":{"id":"2108.05346","kind":"arxiv","version":3},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2021-08-11T17:56:37Z","cross_cats_sorted":["physics.optics"],"title_canon_sha256":"a316663693a539cfa74347c76679a8bd4944659bfa9310e0d978603fda86ce65","abstract_canon_sha256":"dffd4bf0215cf561c2f0fbdfd01ca1e813a5a5e22a79a4d9cd6f91b27df96c3f"},"schema_version":"1.0"},"canonical_sha256":"381c81d8cf70a810c792fe9c7cbcaf9e4efa13b08959d1e45a78ef8086084b2b","source":{"kind":"arxiv","id":"2108.05346","version":3},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2108.05346","created_at":"2026-07-05T04:27:44Z"},{"alias_kind":"arxiv_version","alias_value":"2108.05346v3","created_at":"2026-07-05T04:27:44Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2108.05346","created_at":"2026-07-05T04:27:44Z"},{"alias_kind":"pith_short_12","alias_value":"HAOIDWGPOCUB","created_at":"2026-07-05T04:27:44Z"},{"alias_kind":"pith_short_16","alias_value":"HAOIDWGPOCUBBR4S","created_at":"2026-07-05T04:27:44Z"},{"alias_kind":"pith_short_8","alias_value":"HAOIDWGP","created_at":"2026-07-05T04:27:44Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:HAOIDWGPOCUBBR4S72OHZPFPTZ","target":"record","payload":{"canonical_record":{"source":{"id":"2108.05346","kind":"arxiv","version":3},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2021-08-11T17:56:37Z","cross_cats_sorted":["physics.optics"],"title_canon_sha256":"a316663693a539cfa74347c76679a8bd4944659bfa9310e0d978603fda86ce65","abstract_canon_sha256":"dffd4bf0215cf561c2f0fbdfd01ca1e813a5a5e22a79a4d9cd6f91b27df96c3f"},"schema_version":"1.0"},"canonical_sha256":"381c81d8cf70a810c792fe9c7cbcaf9e4efa13b08959d1e45a78ef8086084b2b","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T04:27:44.479354Z","signature_b64":"Ys5Br08gJA+e+SCMx3TZc8r/rpFSg6z0iskXX2u4gbLyjgtAf8vjVgxBs/oi3ea/9SLBWiQbLGsil7yCq7DvCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"381c81d8cf70a810c792fe9c7cbcaf9e4efa13b08959d1e45a78ef8086084b2b","last_reissued_at":"2026-07-05T04:27:44.478832Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T04:27:44.478832Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2108.05346","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":"2026-07-05T04:27:44Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"F2Nn+kYfGBV5lhwxfp65e8Y6mNbAmWGe3S7SjlkTocHpykYnE4ul6yVICVeToq3uLBnjMxQW0jR8rLN3T+61BA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-09T13:22:21.668516Z"},"content_sha256":"c489436af91ebb1a7cf4056055aecd32a0f06e0f49eb905853ac6fc359e67404","schema_version":"1.0","event_id":"sha256:c489436af91ebb1a7cf4056055aecd32a0f06e0f49eb905853ac6fc359e67404"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:HAOIDWGPOCUBBR4S72OHZPFPTZ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Quantum microscopy based on Hong-Ou-Mandel interference","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["physics.optics"],"primary_cat":"quant-ph","authors_text":"Ashley Lyons, Bienvenu Ndagano, Daniele Faccio, Dominic Branford, Erik M. Gauger, Hugo Defienne, Niclas Westerberg, Yash D. Shah","submitted_at":"2021-08-11T17:56:37Z","abstract_excerpt":"Hong-Ou-Mandel (HOM) interference, the bunching of indistinguishable photons at a beam splitter, is a staple of quantum optics and lies at the heart of many quantum sensing approaches and recent optical quantum computers. Here, we report a full-field, scan-free, quantum imaging technique that exploits HOM interference to reconstruct the surface depth profile of transparent samples. We demonstrate the ability to retrieve images with micrometre-scale depth features with a photon flux as small as 7 photon pairs per frame. Using a single photon avalanche diode camera we measure both the bunched an"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2108.05346","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2108.05346/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":"2026-07-05T04:27:44Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"E9d+8LOLNG5axsrI55OywGOm/VGzsJ7LsrQu1uWaDHi2TMUumN5ArPfRbfWkJ3Sa34etYj5yBDO1mX2GqnfcDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-09T13:22:21.668897Z"},"content_sha256":"6ac8df3dea314f227b750c9ac8d1903bb43e0a8c79f7cc55be19902e404eb726","schema_version":"1.0","event_id":"sha256:6ac8df3dea314f227b750c9ac8d1903bb43e0a8c79f7cc55be19902e404eb726"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/HAOIDWGPOCUBBR4S72OHZPFPTZ/bundle.json","state_url":"https://pith.science/pith/HAOIDWGPOCUBBR4S72OHZPFPTZ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/HAOIDWGPOCUBBR4S72OHZPFPTZ/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":"2026-07-09T13:22:21Z","links":{"resolver":"https://pith.science/pith/HAOIDWGPOCUBBR4S72OHZPFPTZ","bundle":"https://pith.science/pith/HAOIDWGPOCUBBR4S72OHZPFPTZ/bundle.json","state":"https://pith.science/pith/HAOIDWGPOCUBBR4S72OHZPFPTZ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/HAOIDWGPOCUBBR4S72OHZPFPTZ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:HAOIDWGPOCUBBR4S72OHZPFPTZ","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":"dffd4bf0215cf561c2f0fbdfd01ca1e813a5a5e22a79a4d9cd6f91b27df96c3f","cross_cats_sorted":["physics.optics"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2021-08-11T17:56:37Z","title_canon_sha256":"a316663693a539cfa74347c76679a8bd4944659bfa9310e0d978603fda86ce65"},"schema_version":"1.0","source":{"id":"2108.05346","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2108.05346","created_at":"2026-07-05T04:27:44Z"},{"alias_kind":"arxiv_version","alias_value":"2108.05346v3","created_at":"2026-07-05T04:27:44Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2108.05346","created_at":"2026-07-05T04:27:44Z"},{"alias_kind":"pith_short_12","alias_value":"HAOIDWGPOCUB","created_at":"2026-07-05T04:27:44Z"},{"alias_kind":"pith_short_16","alias_value":"HAOIDWGPOCUBBR4S","created_at":"2026-07-05T04:27:44Z"},{"alias_kind":"pith_short_8","alias_value":"HAOIDWGP","created_at":"2026-07-05T04:27:44Z"}],"graph_snapshots":[{"event_id":"sha256:6ac8df3dea314f227b750c9ac8d1903bb43e0a8c79f7cc55be19902e404eb726","target":"graph","created_at":"2026-07-05T04:27:44Z","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/2108.05346/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Hong-Ou-Mandel (HOM) interference, the bunching of indistinguishable photons at a beam splitter, is a staple of quantum optics and lies at the heart of many quantum sensing approaches and recent optical quantum computers. Here, we report a full-field, scan-free, quantum imaging technique that exploits HOM interference to reconstruct the surface depth profile of transparent samples. We demonstrate the ability to retrieve images with micrometre-scale depth features with a photon flux as small as 7 photon pairs per frame. Using a single photon avalanche diode camera we measure both the bunched an","authors_text":"Ashley Lyons, Bienvenu Ndagano, Daniele Faccio, Dominic Branford, Erik M. Gauger, Hugo Defienne, Niclas Westerberg, Yash D. Shah","cross_cats":["physics.optics"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2021-08-11T17:56:37Z","title":"Quantum microscopy based on Hong-Ou-Mandel interference"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2108.05346","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:c489436af91ebb1a7cf4056055aecd32a0f06e0f49eb905853ac6fc359e67404","target":"record","created_at":"2026-07-05T04:27:44Z","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":"dffd4bf0215cf561c2f0fbdfd01ca1e813a5a5e22a79a4d9cd6f91b27df96c3f","cross_cats_sorted":["physics.optics"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2021-08-11T17:56:37Z","title_canon_sha256":"a316663693a539cfa74347c76679a8bd4944659bfa9310e0d978603fda86ce65"},"schema_version":"1.0","source":{"id":"2108.05346","kind":"arxiv","version":3}},"canonical_sha256":"381c81d8cf70a810c792fe9c7cbcaf9e4efa13b08959d1e45a78ef8086084b2b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"381c81d8cf70a810c792fe9c7cbcaf9e4efa13b08959d1e45a78ef8086084b2b","first_computed_at":"2026-07-05T04:27:44.478832Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T04:27:44.478832Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Ys5Br08gJA+e+SCMx3TZc8r/rpFSg6z0iskXX2u4gbLyjgtAf8vjVgxBs/oi3ea/9SLBWiQbLGsil7yCq7DvCQ==","signature_status":"signed_v1","signed_at":"2026-07-05T04:27:44.479354Z","signed_message":"canonical_sha256_bytes"},"source_id":"2108.05346","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c489436af91ebb1a7cf4056055aecd32a0f06e0f49eb905853ac6fc359e67404","sha256:6ac8df3dea314f227b750c9ac8d1903bb43e0a8c79f7cc55be19902e404eb726"],"state_sha256":"c222260ea121cc8c048b91d4d81883008ee5008d9aca1b5b5b3370f93f018a36"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"AC4W5e7em3/sNh2sVcYvCJ3C8Zy2SshlVR3TK7pgcARmS2QnhX0B1oV7/S4fSRaNSopz4kcPNXUW4K4xauWuBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-09T13:22:21.671362Z","bundle_sha256":"3908e8af5fa49e62e0b2a55195dfd2adefdbf8099b1c4a54637fc25874d3143f"}}