{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:WQVUM5VMCVQHB3MLQ5OOK3DBKI","short_pith_number":"pith:WQVUM5VM","canonical_record":{"source":{"id":"1303.6015","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2013-03-25T01:42:16Z","cross_cats_sorted":["physics.optics"],"title_canon_sha256":"06dcb2c5e1628e77fed2884ee798da566495a1aa8f47f26b2d1ed6a2ae7a2685","abstract_canon_sha256":"88da93d891b10b43979b0aaf1e2c44df13b3a3d41c89a82b1d7899262031e43f"},"schema_version":"1.0"},"canonical_sha256":"b42b4676ac156070ed8b875ce56c615201124de1309a17bb6f7c3b88dad501bd","source":{"kind":"arxiv","id":"1303.6015","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1303.6015","created_at":"2026-05-18T03:27:12Z"},{"alias_kind":"arxiv_version","alias_value":"1303.6015v1","created_at":"2026-05-18T03:27:12Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1303.6015","created_at":"2026-05-18T03:27:12Z"},{"alias_kind":"pith_short_12","alias_value":"WQVUM5VMCVQH","created_at":"2026-05-18T12:28:04Z"},{"alias_kind":"pith_short_16","alias_value":"WQVUM5VMCVQHB3ML","created_at":"2026-05-18T12:28:04Z"},{"alias_kind":"pith_short_8","alias_value":"WQVUM5VM","created_at":"2026-05-18T12:28:04Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:WQVUM5VMCVQHB3MLQ5OOK3DBKI","target":"record","payload":{"canonical_record":{"source":{"id":"1303.6015","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2013-03-25T01:42:16Z","cross_cats_sorted":["physics.optics"],"title_canon_sha256":"06dcb2c5e1628e77fed2884ee798da566495a1aa8f47f26b2d1ed6a2ae7a2685","abstract_canon_sha256":"88da93d891b10b43979b0aaf1e2c44df13b3a3d41c89a82b1d7899262031e43f"},"schema_version":"1.0"},"canonical_sha256":"b42b4676ac156070ed8b875ce56c615201124de1309a17bb6f7c3b88dad501bd","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:27:12.056214Z","signature_b64":"cYE9lfpgxO6z6IRrCQxtSBQph9cuBBbtKb0aLws6LhouNPLdVH9uVt7tdY92+Lm8ozqwvNEPPJL3/GnO0JssCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b42b4676ac156070ed8b875ce56c615201124de1309a17bb6f7c3b88dad501bd","last_reissued_at":"2026-05-18T03:27:12.055537Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:27:12.055537Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1303.6015","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":"2026-05-18T03:27:12Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"2HzcTmkquIeJRXQaKmsCm7ztbQOpR4pFs0BADs68sj9dlWvNlEULORVWcg0IPQSVJnLRwOYWVdaqs3gE2rqoAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-21T21:03:20.117974Z"},"content_sha256":"308ec4409385a287d44a0ca5341f0cbd2700f55591302391c49bb057451b5ccd","schema_version":"1.0","event_id":"sha256:308ec4409385a287d44a0ca5341f0cbd2700f55591302391c49bb057451b5ccd"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:WQVUM5VMCVQHB3MLQ5OOK3DBKI","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Widely tunable single photon source with high purity at telecom wavelength","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.optics"],"primary_cat":"quant-ph","authors_text":"Hugo Benichi, Kentaro Wakui, Masahide Sasaki, Rui-Bo Jin, Ryosuke Shimizu","submitted_at":"2013-03-25T01:42:16Z","abstract_excerpt":"We theoretically and experimentally investigate the spectral tunability and purity of photon pairs generated from spontaneous parametric down conversion in periodically poled $\\mathrm{KTiOPO_4}$ crystal with group-velocity matching condition. The numerical simulation predicts that the purity of joint spectral intensity ($P_{JSI}$) and the purity of joint spectral amplitude ($P_{JSA}$) can be kept higher than 0.98 and 0.81, respectively, when the wavelength is tuned from 1460 nm to 1675 nm, which covers the S-, C-, L-, and U-band in telecommunication wavelengths. We also directly measured the j"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1303.6015","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":"2026-05-18T03:27:12Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"oG91ui26z+ev3P/euAKMGRvND9zXGzvl8XLrgIxU26Nm3nXRcKvWnKbPvXpeXXjsyUODobpNladZsWl3cTDwDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-21T21:03:20.118610Z"},"content_sha256":"752e654404b3fefb15b1042aabdb1bcf84d71ebf49e483b0e2f42b6adcc62e7f","schema_version":"1.0","event_id":"sha256:752e654404b3fefb15b1042aabdb1bcf84d71ebf49e483b0e2f42b6adcc62e7f"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/WQVUM5VMCVQHB3MLQ5OOK3DBKI/bundle.json","state_url":"https://pith.science/pith/WQVUM5VMCVQHB3MLQ5OOK3DBKI/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/WQVUM5VMCVQHB3MLQ5OOK3DBKI/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":"2026-06-21T21:03:20Z","links":{"resolver":"https://pith.science/pith/WQVUM5VMCVQHB3MLQ5OOK3DBKI","bundle":"https://pith.science/pith/WQVUM5VMCVQHB3MLQ5OOK3DBKI/bundle.json","state":"https://pith.science/pith/WQVUM5VMCVQHB3MLQ5OOK3DBKI/state.json","well_known_bundle":"https://pith.science/.well-known/pith/WQVUM5VMCVQHB3MLQ5OOK3DBKI/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:WQVUM5VMCVQHB3MLQ5OOK3DBKI","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":"88da93d891b10b43979b0aaf1e2c44df13b3a3d41c89a82b1d7899262031e43f","cross_cats_sorted":["physics.optics"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2013-03-25T01:42:16Z","title_canon_sha256":"06dcb2c5e1628e77fed2884ee798da566495a1aa8f47f26b2d1ed6a2ae7a2685"},"schema_version":"1.0","source":{"id":"1303.6015","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1303.6015","created_at":"2026-05-18T03:27:12Z"},{"alias_kind":"arxiv_version","alias_value":"1303.6015v1","created_at":"2026-05-18T03:27:12Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1303.6015","created_at":"2026-05-18T03:27:12Z"},{"alias_kind":"pith_short_12","alias_value":"WQVUM5VMCVQH","created_at":"2026-05-18T12:28:04Z"},{"alias_kind":"pith_short_16","alias_value":"WQVUM5VMCVQHB3ML","created_at":"2026-05-18T12:28:04Z"},{"alias_kind":"pith_short_8","alias_value":"WQVUM5VM","created_at":"2026-05-18T12:28:04Z"}],"graph_snapshots":[{"event_id":"sha256:752e654404b3fefb15b1042aabdb1bcf84d71ebf49e483b0e2f42b6adcc62e7f","target":"graph","created_at":"2026-05-18T03:27:12Z","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 theoretically and experimentally investigate the spectral tunability and purity of photon pairs generated from spontaneous parametric down conversion in periodically poled $\\mathrm{KTiOPO_4}$ crystal with group-velocity matching condition. The numerical simulation predicts that the purity of joint spectral intensity ($P_{JSI}$) and the purity of joint spectral amplitude ($P_{JSA}$) can be kept higher than 0.98 and 0.81, respectively, when the wavelength is tuned from 1460 nm to 1675 nm, which covers the S-, C-, L-, and U-band in telecommunication wavelengths. We also directly measured the j","authors_text":"Hugo Benichi, Kentaro Wakui, Masahide Sasaki, Rui-Bo Jin, Ryosuke Shimizu","cross_cats":["physics.optics"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2013-03-25T01:42:16Z","title":"Widely tunable single photon source with high purity at telecom wavelength"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1303.6015","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":"sha256:308ec4409385a287d44a0ca5341f0cbd2700f55591302391c49bb057451b5ccd","target":"record","created_at":"2026-05-18T03:27:12Z","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":"88da93d891b10b43979b0aaf1e2c44df13b3a3d41c89a82b1d7899262031e43f","cross_cats_sorted":["physics.optics"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2013-03-25T01:42:16Z","title_canon_sha256":"06dcb2c5e1628e77fed2884ee798da566495a1aa8f47f26b2d1ed6a2ae7a2685"},"schema_version":"1.0","source":{"id":"1303.6015","kind":"arxiv","version":1}},"canonical_sha256":"b42b4676ac156070ed8b875ce56c615201124de1309a17bb6f7c3b88dad501bd","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b42b4676ac156070ed8b875ce56c615201124de1309a17bb6f7c3b88dad501bd","first_computed_at":"2026-05-18T03:27:12.055537Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:27:12.055537Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"cYE9lfpgxO6z6IRrCQxtSBQph9cuBBbtKb0aLws6LhouNPLdVH9uVt7tdY92+Lm8ozqwvNEPPJL3/GnO0JssCQ==","signature_status":"signed_v1","signed_at":"2026-05-18T03:27:12.056214Z","signed_message":"canonical_sha256_bytes"},"source_id":"1303.6015","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:308ec4409385a287d44a0ca5341f0cbd2700f55591302391c49bb057451b5ccd","sha256:752e654404b3fefb15b1042aabdb1bcf84d71ebf49e483b0e2f42b6adcc62e7f"],"state_sha256":"9a869766920f63d79c470f96aadecaf695fa7dcf614c3c899e500b89abe1132b"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"4k1+P0iWfn9YtTPL3XFMngTJim1Yz7HlPTlE2X6LZv9HUcjIsPg2sVDLit44DuV5oU8es/WWkN2cAptxZ4BLAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-21T21:03:20.121329Z","bundle_sha256":"48c36f0716a30acb00efc9d0b193e926bce752f1be68f5c710ce20519c5130c6"}}