{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:IK6E6JAQ27O3J5HH2OXT452X2Q","short_pith_number":"pith:IK6E6JAQ","canonical_record":{"source":{"id":"1501.05686","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2015-01-23T00:34:24Z","cross_cats_sorted":[],"title_canon_sha256":"3e4f262cf30c08ea4eb005070a027a2459b7246c42f65fad2f9a4f5110c1bfa0","abstract_canon_sha256":"316dd3d8097a3c81eaa294feeb179a42e33b9ceb7d6340b54064bb831f625681"},"schema_version":"1.0"},"canonical_sha256":"42bc4f2410d7ddb4f4e7d3af3e7757d42d4172ca5a38dbe4b49a7aa88b97fad6","source":{"kind":"arxiv","id":"1501.05686","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1501.05686","created_at":"2026-05-18T01:41:09Z"},{"alias_kind":"arxiv_version","alias_value":"1501.05686v1","created_at":"2026-05-18T01:41:09Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1501.05686","created_at":"2026-05-18T01:41:09Z"},{"alias_kind":"pith_short_12","alias_value":"IK6E6JAQ27O3","created_at":"2026-05-18T12:29:25Z"},{"alias_kind":"pith_short_16","alias_value":"IK6E6JAQ27O3J5HH","created_at":"2026-05-18T12:29:25Z"},{"alias_kind":"pith_short_8","alias_value":"IK6E6JAQ","created_at":"2026-05-18T12:29:25Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:IK6E6JAQ27O3J5HH2OXT452X2Q","target":"record","payload":{"canonical_record":{"source":{"id":"1501.05686","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2015-01-23T00:34:24Z","cross_cats_sorted":[],"title_canon_sha256":"3e4f262cf30c08ea4eb005070a027a2459b7246c42f65fad2f9a4f5110c1bfa0","abstract_canon_sha256":"316dd3d8097a3c81eaa294feeb179a42e33b9ceb7d6340b54064bb831f625681"},"schema_version":"1.0"},"canonical_sha256":"42bc4f2410d7ddb4f4e7d3af3e7757d42d4172ca5a38dbe4b49a7aa88b97fad6","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:41:09.148688Z","signature_b64":"Cc47GfTLDOc1UEdllTMQHyf8haWVNtd38RL2gI0uZlEzGUsjIDkvsFR5peCIWckp58qCqwf+/ffUIW7vugS1Bg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"42bc4f2410d7ddb4f4e7d3af3e7757d42d4172ca5a38dbe4b49a7aa88b97fad6","last_reissued_at":"2026-05-18T01:41:09.148175Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:41:09.148175Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1501.05686","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":"2026-05-18T01:41:09Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"RJAleJ+t+EyAFQ5c4HYn+gSDdf2faN6/AjCnVXgvpVBO3FvS4/6uU+J/i1odbdiWpzu/3geiG+lHHzgiAUR0BQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T00:11:44.147079Z"},"content_sha256":"0da6903fa37db3b36011cda92d07c847e530d4172ad93da7efba5f56185548d8","schema_version":"1.0","event_id":"sha256:0da6903fa37db3b36011cda92d07c847e530d4172ad93da7efba5f56185548d8"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:IK6E6JAQ27O3J5HH2OXT452X2Q","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Modified E91 protocol demonstration with hybrid entanglement photon source","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Akihisa Tomita, Hirotaka Terai, Ken-ichiro Yoshino, Masahide Sasaki, Mikio Fujiwara, Morio Toyoshima, Shigehito Miki, Taro Yamashita, Yoshihiro Nambu, Zhen Wang","submitted_at":"2015-01-23T00:34:24Z","abstract_excerpt":"We report on an experimental demonstration of the modified Ekert 91 protocol of quantum key distribution using a hybrid entanglement source with two different degrees of freedoms, a 1550 nm time-bin qubit and 810 nm polarization qubit. The violation of the Clauser-Horne-Shimony-Holt inequality could be demonstrated for the entanglement between the polarization qubit in free space and the time-bin qubit through 20 km fiber transmission. The secure key rate in our system is estimated 70-150 bps."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1501.05686","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":"2026-05-18T01:41:09Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"rgu/nHfQni8TehZS7pzXiuLSZYxAZh3WMGf0/knoyYUoTltWBar5auqzD3nEnr6qSCUaxN31QGtmh/hr5rQQBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T00:11:44.147788Z"},"content_sha256":"97b852a75c0cbdcca3217db0ec710c15e9499db2938daed2a18ae8a06e6be01a","schema_version":"1.0","event_id":"sha256:97b852a75c0cbdcca3217db0ec710c15e9499db2938daed2a18ae8a06e6be01a"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/IK6E6JAQ27O3J5HH2OXT452X2Q/bundle.json","state_url":"https://pith.science/pith/IK6E6JAQ27O3J5HH2OXT452X2Q/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/IK6E6JAQ27O3J5HH2OXT452X2Q/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":"2026-05-28T00:11:44Z","links":{"resolver":"https://pith.science/pith/IK6E6JAQ27O3J5HH2OXT452X2Q","bundle":"https://pith.science/pith/IK6E6JAQ27O3J5HH2OXT452X2Q/bundle.json","state":"https://pith.science/pith/IK6E6JAQ27O3J5HH2OXT452X2Q/state.json","well_known_bundle":"https://pith.science/.well-known/pith/IK6E6JAQ27O3J5HH2OXT452X2Q/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:IK6E6JAQ27O3J5HH2OXT452X2Q","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":"316dd3d8097a3c81eaa294feeb179a42e33b9ceb7d6340b54064bb831f625681","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2015-01-23T00:34:24Z","title_canon_sha256":"3e4f262cf30c08ea4eb005070a027a2459b7246c42f65fad2f9a4f5110c1bfa0"},"schema_version":"1.0","source":{"id":"1501.05686","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1501.05686","created_at":"2026-05-18T01:41:09Z"},{"alias_kind":"arxiv_version","alias_value":"1501.05686v1","created_at":"2026-05-18T01:41:09Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1501.05686","created_at":"2026-05-18T01:41:09Z"},{"alias_kind":"pith_short_12","alias_value":"IK6E6JAQ27O3","created_at":"2026-05-18T12:29:25Z"},{"alias_kind":"pith_short_16","alias_value":"IK6E6JAQ27O3J5HH","created_at":"2026-05-18T12:29:25Z"},{"alias_kind":"pith_short_8","alias_value":"IK6E6JAQ","created_at":"2026-05-18T12:29:25Z"}],"graph_snapshots":[{"event_id":"sha256:97b852a75c0cbdcca3217db0ec710c15e9499db2938daed2a18ae8a06e6be01a","target":"graph","created_at":"2026-05-18T01:41:09Z","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 an experimental demonstration of the modified Ekert 91 protocol of quantum key distribution using a hybrid entanglement source with two different degrees of freedoms, a 1550 nm time-bin qubit and 810 nm polarization qubit. The violation of the Clauser-Horne-Shimony-Holt inequality could be demonstrated for the entanglement between the polarization qubit in free space and the time-bin qubit through 20 km fiber transmission. The secure key rate in our system is estimated 70-150 bps.","authors_text":"Akihisa Tomita, Hirotaka Terai, Ken-ichiro Yoshino, Masahide Sasaki, Mikio Fujiwara, Morio Toyoshima, Shigehito Miki, Taro Yamashita, Yoshihiro Nambu, Zhen Wang","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2015-01-23T00:34:24Z","title":"Modified E91 protocol demonstration with hybrid entanglement photon source"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1501.05686","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":"sha256:0da6903fa37db3b36011cda92d07c847e530d4172ad93da7efba5f56185548d8","target":"record","created_at":"2026-05-18T01:41:09Z","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":"316dd3d8097a3c81eaa294feeb179a42e33b9ceb7d6340b54064bb831f625681","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2015-01-23T00:34:24Z","title_canon_sha256":"3e4f262cf30c08ea4eb005070a027a2459b7246c42f65fad2f9a4f5110c1bfa0"},"schema_version":"1.0","source":{"id":"1501.05686","kind":"arxiv","version":1}},"canonical_sha256":"42bc4f2410d7ddb4f4e7d3af3e7757d42d4172ca5a38dbe4b49a7aa88b97fad6","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"42bc4f2410d7ddb4f4e7d3af3e7757d42d4172ca5a38dbe4b49a7aa88b97fad6","first_computed_at":"2026-05-18T01:41:09.148175Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:41:09.148175Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Cc47GfTLDOc1UEdllTMQHyf8haWVNtd38RL2gI0uZlEzGUsjIDkvsFR5peCIWckp58qCqwf+/ffUIW7vugS1Bg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:41:09.148688Z","signed_message":"canonical_sha256_bytes"},"source_id":"1501.05686","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:0da6903fa37db3b36011cda92d07c847e530d4172ad93da7efba5f56185548d8","sha256:97b852a75c0cbdcca3217db0ec710c15e9499db2938daed2a18ae8a06e6be01a"],"state_sha256":"2f6899c12f7db55ed16dfb5f8f723e25da2ab830a0c8375279427ae56298e502"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"t5WE1vzPPfA30EvZ9uW15mBJ7YU9IGbXZLche3tBI2x+IQlJ+EFjf+c7RUKCPBS4n4syQrzZvYgzV0TVKQqODg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-28T00:11:44.151483Z","bundle_sha256":"ae452f2dbf91994c5f2e209af6d19562038bae3002a4e39587cdcfb0380f3718"}}