{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2010:LNHEESSZRAEPHHLRQ5QMKLHVEC","short_pith_number":"pith:LNHEESSZ","canonical_record":{"source":{"id":"1008.0893","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2010-08-05T00:12:30Z","cross_cats_sorted":[],"title_canon_sha256":"ba713723b92693d56684897f9bd0907ebdf80a6a60c5bde697204002c4d214f8","abstract_canon_sha256":"e3e05fba2ea1fb9b9e01206e0c425de3d57073f1223fc4b04d0cbe50ced50fea"},"schema_version":"1.0"},"canonical_sha256":"5b4e424a598808f39d718760c52cf520bed421a19971062d6277ea40a5108f34","source":{"kind":"arxiv","id":"1008.0893","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1008.0893","created_at":"2026-05-18T02:05:59Z"},{"alias_kind":"arxiv_version","alias_value":"1008.0893v1","created_at":"2026-05-18T02:05:59Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1008.0893","created_at":"2026-05-18T02:05:59Z"},{"alias_kind":"pith_short_12","alias_value":"LNHEESSZRAEP","created_at":"2026-05-18T12:26:10Z"},{"alias_kind":"pith_short_16","alias_value":"LNHEESSZRAEPHHLR","created_at":"2026-05-18T12:26:10Z"},{"alias_kind":"pith_short_8","alias_value":"LNHEESSZ","created_at":"2026-05-18T12:26:10Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2010:LNHEESSZRAEPHHLRQ5QMKLHVEC","target":"record","payload":{"canonical_record":{"source":{"id":"1008.0893","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2010-08-05T00:12:30Z","cross_cats_sorted":[],"title_canon_sha256":"ba713723b92693d56684897f9bd0907ebdf80a6a60c5bde697204002c4d214f8","abstract_canon_sha256":"e3e05fba2ea1fb9b9e01206e0c425de3d57073f1223fc4b04d0cbe50ced50fea"},"schema_version":"1.0"},"canonical_sha256":"5b4e424a598808f39d718760c52cf520bed421a19971062d6277ea40a5108f34","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:05:59.120008Z","signature_b64":"ILNW+FmDry9n1TxYzTmm/qHw4xg9mXm1jcEi1AKalNxViRnBxvDNYrbMZ+8Ev0vA/NBjQmiQu5u/8zAw41JiDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"5b4e424a598808f39d718760c52cf520bed421a19971062d6277ea40a5108f34","last_reissued_at":"2026-05-18T02:05:59.119280Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:05:59.119280Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1008.0893","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":"2026-05-18T02:05:59Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"kLxS0xXY5cqVvpHXXhbXdzo3ThXdFaDP8NZzcvcxVjkQq5YpWoNchEGgOO8q4d843FNkwxII8CbW8cH9+PrLDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-06T23:20:06.371057Z"},"content_sha256":"bdeddfc6b3b02254023cd6a03ccefa739024f954c72fcb48c24b6b047c70d24e","schema_version":"1.0","event_id":"sha256:bdeddfc6b3b02254023cd6a03ccefa739024f954c72fcb48c24b6b047c70d24e"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2010:LNHEESSZRAEPHHLRQ5QMKLHVEC","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Photon level crosstalk between parallel fibers installed in urban area","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Masahide Sasaki, Mikio Fujiwara, Shigehito Miki, Taro Yamashita, Zhen Wang","submitted_at":"2010-08-05T00:12:30Z","abstract_excerpt":"We estimate the channel characteristics of field-installed dark fibers at single photon levels for quantum key distribution (QKD). Measured fibers are telecom single-mode dark fibers over 45 km connecting a center and suburbs of Tokyo. Their total losses are about 14dB, and 50% of the whole lengths are aerial lines. We find that stray light from other public internet fibers is dominant and crosstalk occurs at bending points in laying cables. These results mean the crosstalk from public networks can increase the bit error rate in the QKD system, and imply an underlying information leakage throu"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1008.0893","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":"2026-05-18T02:05:59Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ZEiKzKhYj3aYZmaB9fNLQjLin8diRvg4xG450hYTFDEeGeSj7T7SBcRbHPtIxevu0EyB0q6JYvCkTeieJRPJDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-06T23:20:06.371795Z"},"content_sha256":"35217448c62792ab672bd04d20d649848e93e6a5d4c35c18ec09624f705067c8","schema_version":"1.0","event_id":"sha256:35217448c62792ab672bd04d20d649848e93e6a5d4c35c18ec09624f705067c8"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/LNHEESSZRAEPHHLRQ5QMKLHVEC/bundle.json","state_url":"https://pith.science/pith/LNHEESSZRAEPHHLRQ5QMKLHVEC/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/LNHEESSZRAEPHHLRQ5QMKLHVEC/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":"2026-06-06T23:20:06Z","links":{"resolver":"https://pith.science/pith/LNHEESSZRAEPHHLRQ5QMKLHVEC","bundle":"https://pith.science/pith/LNHEESSZRAEPHHLRQ5QMKLHVEC/bundle.json","state":"https://pith.science/pith/LNHEESSZRAEPHHLRQ5QMKLHVEC/state.json","well_known_bundle":"https://pith.science/.well-known/pith/LNHEESSZRAEPHHLRQ5QMKLHVEC/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2010:LNHEESSZRAEPHHLRQ5QMKLHVEC","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":"e3e05fba2ea1fb9b9e01206e0c425de3d57073f1223fc4b04d0cbe50ced50fea","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2010-08-05T00:12:30Z","title_canon_sha256":"ba713723b92693d56684897f9bd0907ebdf80a6a60c5bde697204002c4d214f8"},"schema_version":"1.0","source":{"id":"1008.0893","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1008.0893","created_at":"2026-05-18T02:05:59Z"},{"alias_kind":"arxiv_version","alias_value":"1008.0893v1","created_at":"2026-05-18T02:05:59Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1008.0893","created_at":"2026-05-18T02:05:59Z"},{"alias_kind":"pith_short_12","alias_value":"LNHEESSZRAEP","created_at":"2026-05-18T12:26:10Z"},{"alias_kind":"pith_short_16","alias_value":"LNHEESSZRAEPHHLR","created_at":"2026-05-18T12:26:10Z"},{"alias_kind":"pith_short_8","alias_value":"LNHEESSZ","created_at":"2026-05-18T12:26:10Z"}],"graph_snapshots":[{"event_id":"sha256:35217448c62792ab672bd04d20d649848e93e6a5d4c35c18ec09624f705067c8","target":"graph","created_at":"2026-05-18T02:05:59Z","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 estimate the channel characteristics of field-installed dark fibers at single photon levels for quantum key distribution (QKD). Measured fibers are telecom single-mode dark fibers over 45 km connecting a center and suburbs of Tokyo. Their total losses are about 14dB, and 50% of the whole lengths are aerial lines. We find that stray light from other public internet fibers is dominant and crosstalk occurs at bending points in laying cables. These results mean the crosstalk from public networks can increase the bit error rate in the QKD system, and imply an underlying information leakage throu","authors_text":"Masahide Sasaki, Mikio Fujiwara, Shigehito Miki, Taro Yamashita, Zhen Wang","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2010-08-05T00:12:30Z","title":"Photon level crosstalk between parallel fibers installed in urban area"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1008.0893","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:bdeddfc6b3b02254023cd6a03ccefa739024f954c72fcb48c24b6b047c70d24e","target":"record","created_at":"2026-05-18T02:05:59Z","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":"e3e05fba2ea1fb9b9e01206e0c425de3d57073f1223fc4b04d0cbe50ced50fea","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2010-08-05T00:12:30Z","title_canon_sha256":"ba713723b92693d56684897f9bd0907ebdf80a6a60c5bde697204002c4d214f8"},"schema_version":"1.0","source":{"id":"1008.0893","kind":"arxiv","version":1}},"canonical_sha256":"5b4e424a598808f39d718760c52cf520bed421a19971062d6277ea40a5108f34","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"5b4e424a598808f39d718760c52cf520bed421a19971062d6277ea40a5108f34","first_computed_at":"2026-05-18T02:05:59.119280Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:05:59.119280Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"ILNW+FmDry9n1TxYzTmm/qHw4xg9mXm1jcEi1AKalNxViRnBxvDNYrbMZ+8Ev0vA/NBjQmiQu5u/8zAw41JiDw==","signature_status":"signed_v1","signed_at":"2026-05-18T02:05:59.120008Z","signed_message":"canonical_sha256_bytes"},"source_id":"1008.0893","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:bdeddfc6b3b02254023cd6a03ccefa739024f954c72fcb48c24b6b047c70d24e","sha256:35217448c62792ab672bd04d20d649848e93e6a5d4c35c18ec09624f705067c8"],"state_sha256":"2152d462603529d31a9d4e5a3957f46e4509b480f49f01519ef60702a8c3a437"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"O3TuL02d+s4rcPwlORoj+tA9HYnotYzNEL4zpRkL7WVIlCwECSDeZkqi/BEtVqfgNBOlyNIGIYTMC+d17ItQCA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-06T23:20:06.376036Z","bundle_sha256":"9da497b3c52b5f60cdefd8faaf346b7b371e16450c4418577b5a872c0503e1b6"}}