{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2017:PH2U3SOA6LJ33JVVUW2STRFJPG","short_pith_number":"pith:PH2U3SOA","schema_version":"1.0","canonical_sha256":"79f54dc9c0f2d3bda6b5a5b529c4a979971f0cf55a9f7fda5ed1612b54c8c9da","source":{"kind":"arxiv","id":"1706.01790","version":1},"attestation_state":"computed","paper":{"title":"Heralding pure single photons: a comparision between counter-propagating and co-propagating twin photons","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Alessandra Gatti, Enrico Brambilla","submitted_at":"2017-06-06T14:39:06Z","abstract_excerpt":"We investigate different strategies suitable to generate pure heralded single photons through spontaneous parametric down-conversion, comparing the counter-propagating geometry studied in [1] with more conventional co-propagating configurations which enhance the purity of the heralded photon state through the technique of group-velocity matching. Our analysis is based on the correlation of twin photons in the temporal domain,a non-standard approach that provides a physical view of the mechanisms that permit to eliminate the temporal entanglement of the state and to generate high-purity heralde"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1706.01790","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2017-06-06T14:39:06Z","cross_cats_sorted":[],"title_canon_sha256":"718e09d29f30c6dfbacc5037217fd29c37eb051076d132ce777df6efe6c12360","abstract_canon_sha256":"b7948a6169db20551e57c69d317ebf545ac9695a3ce7e6fc4564c5e3db6b18e6"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:24:52.509865Z","signature_b64":"HUBYV7JuKpYTePTXupbqCSh1bAsE34Ooj9zvCo6486PQqUdzEOY3RdBKNWF5APlKB08K8lcUpv7xZgmc0ed7Dw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"79f54dc9c0f2d3bda6b5a5b529c4a979971f0cf55a9f7fda5ed1612b54c8c9da","last_reissued_at":"2026-05-18T00:24:52.509276Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:24:52.509276Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Heralding pure single photons: a comparision between counter-propagating and co-propagating twin photons","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Alessandra Gatti, Enrico Brambilla","submitted_at":"2017-06-06T14:39:06Z","abstract_excerpt":"We investigate different strategies suitable to generate pure heralded single photons through spontaneous parametric down-conversion, comparing the counter-propagating geometry studied in [1] with more conventional co-propagating configurations which enhance the purity of the heralded photon state through the technique of group-velocity matching. Our analysis is based on the correlation of twin photons in the temporal domain,a non-standard approach that provides a physical view of the mechanisms that permit to eliminate the temporal entanglement of the state and to generate high-purity heralde"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1706.01790","kind":"arxiv","version":1},"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"},"aliases":[{"alias_kind":"arxiv","alias_value":"1706.01790","created_at":"2026-05-18T00:24:52.509408+00:00"},{"alias_kind":"arxiv_version","alias_value":"1706.01790v1","created_at":"2026-05-18T00:24:52.509408+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1706.01790","created_at":"2026-05-18T00:24:52.509408+00:00"},{"alias_kind":"pith_short_12","alias_value":"PH2U3SOA6LJ3","created_at":"2026-05-18T12:31:37.085036+00:00"},{"alias_kind":"pith_short_16","alias_value":"PH2U3SOA6LJ33JVV","created_at":"2026-05-18T12:31:37.085036+00:00"},{"alias_kind":"pith_short_8","alias_value":"PH2U3SOA","created_at":"2026-05-18T12:31:37.085036+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/PH2U3SOA6LJ33JVVUW2STRFJPG","json":"https://pith.science/pith/PH2U3SOA6LJ33JVVUW2STRFJPG.json","graph_json":"https://pith.science/api/pith-number/PH2U3SOA6LJ33JVVUW2STRFJPG/graph.json","events_json":"https://pith.science/api/pith-number/PH2U3SOA6LJ33JVVUW2STRFJPG/events.json","paper":"https://pith.science/paper/PH2U3SOA"},"agent_actions":{"view_html":"https://pith.science/pith/PH2U3SOA6LJ33JVVUW2STRFJPG","download_json":"https://pith.science/pith/PH2U3SOA6LJ33JVVUW2STRFJPG.json","view_paper":"https://pith.science/paper/PH2U3SOA","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1706.01790&json=true","fetch_graph":"https://pith.science/api/pith-number/PH2U3SOA6LJ33JVVUW2STRFJPG/graph.json","fetch_events":"https://pith.science/api/pith-number/PH2U3SOA6LJ33JVVUW2STRFJPG/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/PH2U3SOA6LJ33JVVUW2STRFJPG/action/timestamp_anchor","attest_storage":"https://pith.science/pith/PH2U3SOA6LJ33JVVUW2STRFJPG/action/storage_attestation","attest_author":"https://pith.science/pith/PH2U3SOA6LJ33JVVUW2STRFJPG/action/author_attestation","sign_citation":"https://pith.science/pith/PH2U3SOA6LJ33JVVUW2STRFJPG/action/citation_signature","submit_replication":"https://pith.science/pith/PH2U3SOA6LJ33JVVUW2STRFJPG/action/replication_record"}},"created_at":"2026-05-18T00:24:52.509408+00:00","updated_at":"2026-05-18T00:24:52.509408+00:00"}