{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2012:IZUQR2HDVQIMNUWQLQBZN2YKMM","short_pith_number":"pith:IZUQR2HD","canonical_record":{"source":{"id":"1207.0441","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2012-07-02T16:34:44Z","cross_cats_sorted":[],"title_canon_sha256":"34d02a219e6988fa3c1504a21b1f31aade98dc411507b4d3cc77e08d35d6e8f7","abstract_canon_sha256":"066b9620ac28f8e93b9aa6c2e7f53194e321c2d598ef5df6a5fc810b88ebb004"},"schema_version":"1.0"},"canonical_sha256":"466908e8e3ac10c6d2d05c0396eb0a6332ccce37f3c0c1eda64d24dc9915f147","source":{"kind":"arxiv","id":"1207.0441","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1207.0441","created_at":"2026-05-18T01:56:35Z"},{"alias_kind":"arxiv_version","alias_value":"1207.0441v1","created_at":"2026-05-18T01:56:35Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1207.0441","created_at":"2026-05-18T01:56:35Z"},{"alias_kind":"pith_short_12","alias_value":"IZUQR2HDVQIM","created_at":"2026-05-18T12:27:09Z"},{"alias_kind":"pith_short_16","alias_value":"IZUQR2HDVQIMNUWQ","created_at":"2026-05-18T12:27:09Z"},{"alias_kind":"pith_short_8","alias_value":"IZUQR2HD","created_at":"2026-05-18T12:27:09Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2012:IZUQR2HDVQIMNUWQLQBZN2YKMM","target":"record","payload":{"canonical_record":{"source":{"id":"1207.0441","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2012-07-02T16:34:44Z","cross_cats_sorted":[],"title_canon_sha256":"34d02a219e6988fa3c1504a21b1f31aade98dc411507b4d3cc77e08d35d6e8f7","abstract_canon_sha256":"066b9620ac28f8e93b9aa6c2e7f53194e321c2d598ef5df6a5fc810b88ebb004"},"schema_version":"1.0"},"canonical_sha256":"466908e8e3ac10c6d2d05c0396eb0a6332ccce37f3c0c1eda64d24dc9915f147","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:56:35.665380Z","signature_b64":"c4pJb4TZ8ZV1I9WyDB5BhaBWNBFAulVbaofFv7ociO6HhygBnJTZU5jLaVRj2qIQvxNwyMmpAX0fluWjrmoyBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"466908e8e3ac10c6d2d05c0396eb0a6332ccce37f3c0c1eda64d24dc9915f147","last_reissued_at":"2026-05-18T01:56:35.664987Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:56:35.664987Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1207.0441","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:56:35Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"/HrGttmjQ1GDwVmEhyYnT9SVUND/iN+anNjq2kwYJTY+0kHl+i0ldKPD4L4KI4/WTbrkHTftH4mGwBL6eVT0Aw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T23:30:16.091479Z"},"content_sha256":"b30561e53987167bcdf16b4d953b482ad0c3b06a115707c57466de051d2037b8","schema_version":"1.0","event_id":"sha256:b30561e53987167bcdf16b4d953b482ad0c3b06a115707c57466de051d2037b8"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2012:IZUQR2HDVQIMNUWQLQBZN2YKMM","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"MHz rate and efficient synchronous heralding of single photons at telecom wavelengths","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Bruno Sanguinetti, Enrico Pomarico, Hugo Zbinden, Rob Thew, Thiago Guerreiro","submitted_at":"2012-07-02T16:34:44Z","abstract_excerpt":"We report on the realization of a synchronous source of heralded single photons at telecom wavelengths with MHz heralding rates and high heralding efficiency. This source is based on the generation of photon pairs at 810 and 1550 nm via Spontaneous Parametric Down Conversion (SPDC) in a 1 cm periodically poled lithium niobate (PPLN) crystal pumped by a 532 nm pulsed laser. As high rates are fundamental for multi-photon experiments, we show that single telecom photons can be announced at 4.4MHz rate with 45% heralding efficiency. When we focus only on the optimization of the coupling of the her"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1207.0441","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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:56:35Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"bB2qFL/++1ngZigKsol9qnlrl41TJIGFauVU74gqor1AyTbFTuJf+aSObd77Aup2aYW3nNgS7V4RB+GDGdFSAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T23:30:16.092135Z"},"content_sha256":"f6e2f855d1017ee31c3f18baab801ee62f52fd40fa0d242e6a52910431f74fd4","schema_version":"1.0","event_id":"sha256:f6e2f855d1017ee31c3f18baab801ee62f52fd40fa0d242e6a52910431f74fd4"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/IZUQR2HDVQIMNUWQLQBZN2YKMM/bundle.json","state_url":"https://pith.science/pith/IZUQR2HDVQIMNUWQLQBZN2YKMM/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/IZUQR2HDVQIMNUWQLQBZN2YKMM/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":"2026-05-25T23:30:16Z","links":{"resolver":"https://pith.science/pith/IZUQR2HDVQIMNUWQLQBZN2YKMM","bundle":"https://pith.science/pith/IZUQR2HDVQIMNUWQLQBZN2YKMM/bundle.json","state":"https://pith.science/pith/IZUQR2HDVQIMNUWQLQBZN2YKMM/state.json","well_known_bundle":"https://pith.science/.well-known/pith/IZUQR2HDVQIMNUWQLQBZN2YKMM/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:IZUQR2HDVQIMNUWQLQBZN2YKMM","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":"066b9620ac28f8e93b9aa6c2e7f53194e321c2d598ef5df6a5fc810b88ebb004","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2012-07-02T16:34:44Z","title_canon_sha256":"34d02a219e6988fa3c1504a21b1f31aade98dc411507b4d3cc77e08d35d6e8f7"},"schema_version":"1.0","source":{"id":"1207.0441","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1207.0441","created_at":"2026-05-18T01:56:35Z"},{"alias_kind":"arxiv_version","alias_value":"1207.0441v1","created_at":"2026-05-18T01:56:35Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1207.0441","created_at":"2026-05-18T01:56:35Z"},{"alias_kind":"pith_short_12","alias_value":"IZUQR2HDVQIM","created_at":"2026-05-18T12:27:09Z"},{"alias_kind":"pith_short_16","alias_value":"IZUQR2HDVQIMNUWQ","created_at":"2026-05-18T12:27:09Z"},{"alias_kind":"pith_short_8","alias_value":"IZUQR2HD","created_at":"2026-05-18T12:27:09Z"}],"graph_snapshots":[{"event_id":"sha256:f6e2f855d1017ee31c3f18baab801ee62f52fd40fa0d242e6a52910431f74fd4","target":"graph","created_at":"2026-05-18T01:56:35Z","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 the realization of a synchronous source of heralded single photons at telecom wavelengths with MHz heralding rates and high heralding efficiency. This source is based on the generation of photon pairs at 810 and 1550 nm via Spontaneous Parametric Down Conversion (SPDC) in a 1 cm periodically poled lithium niobate (PPLN) crystal pumped by a 532 nm pulsed laser. As high rates are fundamental for multi-photon experiments, we show that single telecom photons can be announced at 4.4MHz rate with 45% heralding efficiency. When we focus only on the optimization of the coupling of the her","authors_text":"Bruno Sanguinetti, Enrico Pomarico, Hugo Zbinden, Rob Thew, Thiago Guerreiro","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2012-07-02T16:34:44Z","title":"MHz rate and efficient synchronous heralding of single photons at telecom wavelengths"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1207.0441","kind":"arxiv","version":1},"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:b30561e53987167bcdf16b4d953b482ad0c3b06a115707c57466de051d2037b8","target":"record","created_at":"2026-05-18T01:56:35Z","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":"066b9620ac28f8e93b9aa6c2e7f53194e321c2d598ef5df6a5fc810b88ebb004","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2012-07-02T16:34:44Z","title_canon_sha256":"34d02a219e6988fa3c1504a21b1f31aade98dc411507b4d3cc77e08d35d6e8f7"},"schema_version":"1.0","source":{"id":"1207.0441","kind":"arxiv","version":1}},"canonical_sha256":"466908e8e3ac10c6d2d05c0396eb0a6332ccce37f3c0c1eda64d24dc9915f147","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"466908e8e3ac10c6d2d05c0396eb0a6332ccce37f3c0c1eda64d24dc9915f147","first_computed_at":"2026-05-18T01:56:35.664987Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:56:35.664987Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"c4pJb4TZ8ZV1I9WyDB5BhaBWNBFAulVbaofFv7ociO6HhygBnJTZU5jLaVRj2qIQvxNwyMmpAX0fluWjrmoyBw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:56:35.665380Z","signed_message":"canonical_sha256_bytes"},"source_id":"1207.0441","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b30561e53987167bcdf16b4d953b482ad0c3b06a115707c57466de051d2037b8","sha256:f6e2f855d1017ee31c3f18baab801ee62f52fd40fa0d242e6a52910431f74fd4"],"state_sha256":"492fa1120adfa147f97a404d0d45356079707b364baf702f747b8a1f1541acde"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"0ZTGa8+hOwz+ofu7BXy6TA5mlWILbRC5jJD6zMoQI/59ahLjG2/XK64ZSHxR5kwUxxiLJFO1ZwK7rrGcBwIdDQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-25T23:30:16.095626Z","bundle_sha256":"a59bd656db39fa643f83993fa2ece5b9eacf91d108bfd4b55fb69337f5cda022"}}