{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:HXPISRM5EHE5BL22EIZEDOIU7N","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":"57d6508dcaa0ff14e4399b443c823a876d39a34cf071d3f8b28434c3e86fe2c1","cross_cats_sorted":["physics.optics"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2012-10-16T20:56:05Z","title_canon_sha256":"9f587e5fc377b8d375523b37ab03c11b3fe945f90404f151e2d7cab6451fc9bf"},"schema_version":"1.0","source":{"id":"1210.4575","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1210.4575","created_at":"2026-05-18T01:53:53Z"},{"alias_kind":"arxiv_version","alias_value":"1210.4575v2","created_at":"2026-05-18T01:53:53Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1210.4575","created_at":"2026-05-18T01:53:53Z"},{"alias_kind":"pith_short_12","alias_value":"HXPISRM5EHE5","created_at":"2026-05-18T12:27:09Z"},{"alias_kind":"pith_short_16","alias_value":"HXPISRM5EHE5BL22","created_at":"2026-05-18T12:27:09Z"},{"alias_kind":"pith_short_8","alias_value":"HXPISRM5","created_at":"2026-05-18T12:27:09Z"}],"graph_snapshots":[{"event_id":"sha256:bd2aa84d47b9c5b584a9487a2365faa393f8dd2556f021facf682b6312c31d08","target":"graph","created_at":"2026-05-18T01:53:53Z","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 report on a Hong-Ou-Mandel (HOM) interference experiment for quantum states with photon numbers per mode as large as 10^6 generated via high-gain parametric down conversion (PDC). The standard technique of coincidence counting leads in this case to a dip with a very low visibility. By measuring, instead of coincidence rate, the variance of the photon-number difference, we observe a peak with 99.99% visibility. From the shape of the peak, one can infer information about the temporal mode structure of the PDC radiation, including the degree of frequency/time entanglement.","authors_text":"Gerd Leuchs, Kirill Yu. Spasibko, Maria V. Chekhova, Timur Sh. Iskhakov","cross_cats":["physics.optics"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2012-10-16T20:56:05Z","title":"Macroscopic Hong-Ou-Mandel interference"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1210.4575","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":"sha256:4266c7d23767c9077dc7b04c739c3488c0277e34d28fd7f1862e74417f71871a","target":"record","created_at":"2026-05-18T01:53:53Z","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":"57d6508dcaa0ff14e4399b443c823a876d39a34cf071d3f8b28434c3e86fe2c1","cross_cats_sorted":["physics.optics"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2012-10-16T20:56:05Z","title_canon_sha256":"9f587e5fc377b8d375523b37ab03c11b3fe945f90404f151e2d7cab6451fc9bf"},"schema_version":"1.0","source":{"id":"1210.4575","kind":"arxiv","version":2}},"canonical_sha256":"3dde89459d21c9d0af5a223241b914fb4f86d0e3ac0e58ecb8ca1114830905cc","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"3dde89459d21c9d0af5a223241b914fb4f86d0e3ac0e58ecb8ca1114830905cc","first_computed_at":"2026-05-18T01:53:53.923125Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:53:53.923125Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"00+ndHPXEiBffJTJL2r/ZVxZM2PzXB/E+a4kUD8AA4/MXuxMcJKqAWpFJq5utk9cT7czL8bBTOjnyCTt0OMBBw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:53:53.923824Z","signed_message":"canonical_sha256_bytes"},"source_id":"1210.4575","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:4266c7d23767c9077dc7b04c739c3488c0277e34d28fd7f1862e74417f71871a","sha256:bd2aa84d47b9c5b584a9487a2365faa393f8dd2556f021facf682b6312c31d08"],"state_sha256":"d3d2d6c446f5b23b5926ec06889f8742eb283da96044b93634b731417b1a58d6"}