{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2010:V3UVXOSZB627YK7XITRGVOAQIF","short_pith_number":"pith:V3UVXOSZ","canonical_record":{"source":{"id":"1007.2599","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2010-07-15T15:57:40Z","cross_cats_sorted":[],"title_canon_sha256":"766a73acb76c2dcbf577d9da5cd821906191a0195190ad70091337a81d494a3f","abstract_canon_sha256":"3b8a042c591e60f424264a23d6aec3016bc3a8ff6ac7ebf14d208b30f43f4d69"},"schema_version":"1.0"},"canonical_sha256":"aee95bba590fb5fc2bf744e26ab810416c5c07c1224831173d7759b47bf5c787","source":{"kind":"arxiv","id":"1007.2599","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1007.2599","created_at":"2026-05-18T04:34:08Z"},{"alias_kind":"arxiv_version","alias_value":"1007.2599v2","created_at":"2026-05-18T04:34:08Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1007.2599","created_at":"2026-05-18T04:34:08Z"},{"alias_kind":"pith_short_12","alias_value":"V3UVXOSZB627","created_at":"2026-05-18T12:26:15Z"},{"alias_kind":"pith_short_16","alias_value":"V3UVXOSZB627YK7X","created_at":"2026-05-18T12:26:15Z"},{"alias_kind":"pith_short_8","alias_value":"V3UVXOSZ","created_at":"2026-05-18T12:26:15Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2010:V3UVXOSZB627YK7XITRGVOAQIF","target":"record","payload":{"canonical_record":{"source":{"id":"1007.2599","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2010-07-15T15:57:40Z","cross_cats_sorted":[],"title_canon_sha256":"766a73acb76c2dcbf577d9da5cd821906191a0195190ad70091337a81d494a3f","abstract_canon_sha256":"3b8a042c591e60f424264a23d6aec3016bc3a8ff6ac7ebf14d208b30f43f4d69"},"schema_version":"1.0"},"canonical_sha256":"aee95bba590fb5fc2bf744e26ab810416c5c07c1224831173d7759b47bf5c787","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:34:08.774123Z","signature_b64":"Jzj6Lcl1LPe18meJXLP6BG6iT1L9pbVuqbNpR0rxSN33NVXpZcsqFxU88NiHNtgrKWwMCo5n67CbFZ4xVopsDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"aee95bba590fb5fc2bf744e26ab810416c5c07c1224831173d7759b47bf5c787","last_reissued_at":"2026-05-18T04:34:08.773747Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:34:08.773747Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1007.2599","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":"2026-05-18T04:34:08Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"3OSbXEQTyr2sYmqV5JYsnRPi3C3VysuAGqUNiWOWmBgFtPajblJEXz05B1mBNWTFlOKB8uqHJph7yp9+4hZZCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-08T23:09:22.034578Z"},"content_sha256":"8e1ea1bf2913b3141014eb01fbb73d2f91fafa1cd42b9902a96783d57d4c022c","schema_version":"1.0","event_id":"sha256:8e1ea1bf2913b3141014eb01fbb73d2f91fafa1cd42b9902a96783d57d4c022c"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2010:V3UVXOSZB627YK7XITRGVOAQIF","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Accessing the purity of a single photon by the width of the Hong-Ou-Mandel interference","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Christine Silberhorn, Kaisa Laiho, Katiuscia N. Cassemiro","submitted_at":"2010-07-15T15:57:40Z","abstract_excerpt":"We demonstrate a method to determine the spectral purity of single photons. The technique is based on the Hong-Ou-Mandel (HOM) interference between a single photon state and a suitably prepared coherent field. We show that the temporal width of the HOM dip is not only related to reciprocal of the spectral width but also to the underlying quantum coherence. Therefore, by measuring the width of both the HOM dip and the spectrum one can directly quantify the degree of spectral purity. The distinct advantage of our proposal is that it obviates the need for perfect mode matching, since it does not "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1007.2599","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":""},"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":"2026-05-18T04:34:08Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"XfZjiXqaZMUV54KNZQ99j2ft0TAo2bwHiR6aYWiWqksL7CLKt4oypanJAQMBrdNuYTPSS2+tUSjw9cM+AqrMAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-08T23:09:22.034925Z"},"content_sha256":"27549618a990c26561d9d091eaa3d0eac5f46ab56955322374e7767a66e2c12f","schema_version":"1.0","event_id":"sha256:27549618a990c26561d9d091eaa3d0eac5f46ab56955322374e7767a66e2c12f"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/V3UVXOSZB627YK7XITRGVOAQIF/bundle.json","state_url":"https://pith.science/pith/V3UVXOSZB627YK7XITRGVOAQIF/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/V3UVXOSZB627YK7XITRGVOAQIF/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":"2026-06-08T23:09:22Z","links":{"resolver":"https://pith.science/pith/V3UVXOSZB627YK7XITRGVOAQIF","bundle":"https://pith.science/pith/V3UVXOSZB627YK7XITRGVOAQIF/bundle.json","state":"https://pith.science/pith/V3UVXOSZB627YK7XITRGVOAQIF/state.json","well_known_bundle":"https://pith.science/.well-known/pith/V3UVXOSZB627YK7XITRGVOAQIF/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2010:V3UVXOSZB627YK7XITRGVOAQIF","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":"3b8a042c591e60f424264a23d6aec3016bc3a8ff6ac7ebf14d208b30f43f4d69","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2010-07-15T15:57:40Z","title_canon_sha256":"766a73acb76c2dcbf577d9da5cd821906191a0195190ad70091337a81d494a3f"},"schema_version":"1.0","source":{"id":"1007.2599","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1007.2599","created_at":"2026-05-18T04:34:08Z"},{"alias_kind":"arxiv_version","alias_value":"1007.2599v2","created_at":"2026-05-18T04:34:08Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1007.2599","created_at":"2026-05-18T04:34:08Z"},{"alias_kind":"pith_short_12","alias_value":"V3UVXOSZB627","created_at":"2026-05-18T12:26:15Z"},{"alias_kind":"pith_short_16","alias_value":"V3UVXOSZB627YK7X","created_at":"2026-05-18T12:26:15Z"},{"alias_kind":"pith_short_8","alias_value":"V3UVXOSZ","created_at":"2026-05-18T12:26:15Z"}],"graph_snapshots":[{"event_id":"sha256:27549618a990c26561d9d091eaa3d0eac5f46ab56955322374e7767a66e2c12f","target":"graph","created_at":"2026-05-18T04:34:08Z","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 demonstrate a method to determine the spectral purity of single photons. The technique is based on the Hong-Ou-Mandel (HOM) interference between a single photon state and a suitably prepared coherent field. We show that the temporal width of the HOM dip is not only related to reciprocal of the spectral width but also to the underlying quantum coherence. Therefore, by measuring the width of both the HOM dip and the spectrum one can directly quantify the degree of spectral purity. The distinct advantage of our proposal is that it obviates the need for perfect mode matching, since it does not ","authors_text":"Christine Silberhorn, Kaisa Laiho, Katiuscia N. Cassemiro","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2010-07-15T15:57:40Z","title":"Accessing the purity of a single photon by the width of the Hong-Ou-Mandel interference"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1007.2599","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":"sha256:8e1ea1bf2913b3141014eb01fbb73d2f91fafa1cd42b9902a96783d57d4c022c","target":"record","created_at":"2026-05-18T04:34:08Z","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":"3b8a042c591e60f424264a23d6aec3016bc3a8ff6ac7ebf14d208b30f43f4d69","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2010-07-15T15:57:40Z","title_canon_sha256":"766a73acb76c2dcbf577d9da5cd821906191a0195190ad70091337a81d494a3f"},"schema_version":"1.0","source":{"id":"1007.2599","kind":"arxiv","version":2}},"canonical_sha256":"aee95bba590fb5fc2bf744e26ab810416c5c07c1224831173d7759b47bf5c787","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"aee95bba590fb5fc2bf744e26ab810416c5c07c1224831173d7759b47bf5c787","first_computed_at":"2026-05-18T04:34:08.773747Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:34:08.773747Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Jzj6Lcl1LPe18meJXLP6BG6iT1L9pbVuqbNpR0rxSN33NVXpZcsqFxU88NiHNtgrKWwMCo5n67CbFZ4xVopsDw==","signature_status":"signed_v1","signed_at":"2026-05-18T04:34:08.774123Z","signed_message":"canonical_sha256_bytes"},"source_id":"1007.2599","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:8e1ea1bf2913b3141014eb01fbb73d2f91fafa1cd42b9902a96783d57d4c022c","sha256:27549618a990c26561d9d091eaa3d0eac5f46ab56955322374e7767a66e2c12f"],"state_sha256":"03df3f18812a177373a1edfc2cc71e9bbe203db786f506419087f8c40e6ab414"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"WZ4lAwr1Y1X/nmge/S6hf6Zx7Px1JQne+Cjvaej7mzFIK4VXyRrQfk9DZcJiaLpIh/pBNHSslpa7fO9JGqV1DQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-08T23:09:22.036858Z","bundle_sha256":"fccf557b9332a172b19ec9529aa766f1534c14841fda82ebec04a702b11e6119"}}