{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:OHIIVMKUBTFDAX5VCWQE64QZSQ","short_pith_number":"pith:OHIIVMKU","canonical_record":{"source":{"id":"2111.00380","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2021-10-31T02:27:44Z","cross_cats_sorted":[],"title_canon_sha256":"f4e7ee4fc95debac0baad0bfbd1f2d3b47e4868786b7757dcef002611bd1cae1","abstract_canon_sha256":"fa6a2aad38d0b26b6292aa125cddd212ec7f4c57ecb985f04b623d195ee50d6c"},"schema_version":"1.0"},"canonical_sha256":"71d08ab1540cca305fb515a04f72199412869611b56139b6f3e3b1b5e2fe827a","source":{"kind":"arxiv","id":"2111.00380","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2111.00380","created_at":"2026-07-05T03:27:42Z"},{"alias_kind":"arxiv_version","alias_value":"2111.00380v1","created_at":"2026-07-05T03:27:42Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2111.00380","created_at":"2026-07-05T03:27:42Z"},{"alias_kind":"pith_short_12","alias_value":"OHIIVMKUBTFD","created_at":"2026-07-05T03:27:42Z"},{"alias_kind":"pith_short_16","alias_value":"OHIIVMKUBTFDAX5V","created_at":"2026-07-05T03:27:42Z"},{"alias_kind":"pith_short_8","alias_value":"OHIIVMKU","created_at":"2026-07-05T03:27:42Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:OHIIVMKUBTFDAX5VCWQE64QZSQ","target":"record","payload":{"canonical_record":{"source":{"id":"2111.00380","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2021-10-31T02:27:44Z","cross_cats_sorted":[],"title_canon_sha256":"f4e7ee4fc95debac0baad0bfbd1f2d3b47e4868786b7757dcef002611bd1cae1","abstract_canon_sha256":"fa6a2aad38d0b26b6292aa125cddd212ec7f4c57ecb985f04b623d195ee50d6c"},"schema_version":"1.0"},"canonical_sha256":"71d08ab1540cca305fb515a04f72199412869611b56139b6f3e3b1b5e2fe827a","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T03:27:42.062718Z","signature_b64":"8LDNwplKt1NsBijf+tBobz7qoE98g9JgvWE51wARbQ1kRTIQ7ydw5iFjtgvVDU6gdksGXiRfzHfgj8kkNh5JDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"71d08ab1540cca305fb515a04f72199412869611b56139b6f3e3b1b5e2fe827a","last_reissued_at":"2026-07-05T03:27:42.062186Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T03:27:42.062186Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2111.00380","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":"2026-07-05T03:27:42Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"1KSMqktQGkBBQZwNljuYXfCebV4xgdBjzqnI63uIRF0J350w0n+2z5RK++N1Z9meA57bRd8TEZmJSwRIxRdTAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-03T15:40:05.187745Z"},"content_sha256":"f8338c5b039c5abbf32ad795b14718a0a32cbe860e61efd839a84c0e18de2766","schema_version":"1.0","event_id":"sha256:f8338c5b039c5abbf32ad795b14718a0a32cbe860e61efd839a84c0e18de2766"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:OHIIVMKUBTFDAX5VCWQE64QZSQ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Demonstration of 50 km Fiber-optic two-way quantum time transfer at femtosecond-scale precision","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Honglei Quan, Huibo Hong, Mingtao Cao, Ruifang Dong, Runai Quan, Shougang Zhang, Tao Liu, Wenxiang Xue, Wenyu Zhao, Xiao Xiang, Yuting Liu","submitted_at":"2021-10-31T02:27:44Z","abstract_excerpt":"The two-way quantum time transfer method has been proposed and experimentally demonstrated for its potential enhancements in precision and better guarantee of security. To further testify its advantage in practical applications, the applicable direct transmission distance as well as the achievable synchronization precision between independent time scales is of great interest. In this paper, an experiment on two-way quantum time transfer has been carried out over a 50 km long fiber link. With the common clock reference, a short-term stability of 2.6 ps at an averaging time of 7 s and a long-ter"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2111.00380","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2111.00380/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-05T03:27:42Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"bpWY82X2DIoa12P0G8hWLkbQ4BULDc3YwQuQMq3Igdhse0/tkTQZYTeqGMvPb7A3B6eC6N/srpChgHM2B0l9DQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-03T15:40:05.188304Z"},"content_sha256":"6cfd18892f17ac7e4ef014a88ac53fb426002c9c1e53fba54fc71316617fe76a","schema_version":"1.0","event_id":"sha256:6cfd18892f17ac7e4ef014a88ac53fb426002c9c1e53fba54fc71316617fe76a"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/OHIIVMKUBTFDAX5VCWQE64QZSQ/bundle.json","state_url":"https://pith.science/pith/OHIIVMKUBTFDAX5VCWQE64QZSQ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/OHIIVMKUBTFDAX5VCWQE64QZSQ/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":"2026-08-03T15:40:05Z","links":{"resolver":"https://pith.science/pith/OHIIVMKUBTFDAX5VCWQE64QZSQ","bundle":"https://pith.science/pith/OHIIVMKUBTFDAX5VCWQE64QZSQ/bundle.json","state":"https://pith.science/pith/OHIIVMKUBTFDAX5VCWQE64QZSQ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/OHIIVMKUBTFDAX5VCWQE64QZSQ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:OHIIVMKUBTFDAX5VCWQE64QZSQ","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":"fa6a2aad38d0b26b6292aa125cddd212ec7f4c57ecb985f04b623d195ee50d6c","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2021-10-31T02:27:44Z","title_canon_sha256":"f4e7ee4fc95debac0baad0bfbd1f2d3b47e4868786b7757dcef002611bd1cae1"},"schema_version":"1.0","source":{"id":"2111.00380","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2111.00380","created_at":"2026-07-05T03:27:42Z"},{"alias_kind":"arxiv_version","alias_value":"2111.00380v1","created_at":"2026-07-05T03:27:42Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2111.00380","created_at":"2026-07-05T03:27:42Z"},{"alias_kind":"pith_short_12","alias_value":"OHIIVMKUBTFD","created_at":"2026-07-05T03:27:42Z"},{"alias_kind":"pith_short_16","alias_value":"OHIIVMKUBTFDAX5V","created_at":"2026-07-05T03:27:42Z"},{"alias_kind":"pith_short_8","alias_value":"OHIIVMKU","created_at":"2026-07-05T03:27:42Z"}],"graph_snapshots":[{"event_id":"sha256:6cfd18892f17ac7e4ef014a88ac53fb426002c9c1e53fba54fc71316617fe76a","target":"graph","created_at":"2026-07-05T03:27:42Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2111.00380/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The two-way quantum time transfer method has been proposed and experimentally demonstrated for its potential enhancements in precision and better guarantee of security. To further testify its advantage in practical applications, the applicable direct transmission distance as well as the achievable synchronization precision between independent time scales is of great interest. In this paper, an experiment on two-way quantum time transfer has been carried out over a 50 km long fiber link. With the common clock reference, a short-term stability of 2.6 ps at an averaging time of 7 s and a long-ter","authors_text":"Honglei Quan, Huibo Hong, Mingtao Cao, Ruifang Dong, Runai Quan, Shougang Zhang, Tao Liu, Wenxiang Xue, Wenyu Zhao, Xiao Xiang, Yuting Liu","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2021-10-31T02:27:44Z","title":"Demonstration of 50 km Fiber-optic two-way quantum time transfer at femtosecond-scale precision"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2111.00380","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:f8338c5b039c5abbf32ad795b14718a0a32cbe860e61efd839a84c0e18de2766","target":"record","created_at":"2026-07-05T03:27:42Z","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":"fa6a2aad38d0b26b6292aa125cddd212ec7f4c57ecb985f04b623d195ee50d6c","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2021-10-31T02:27:44Z","title_canon_sha256":"f4e7ee4fc95debac0baad0bfbd1f2d3b47e4868786b7757dcef002611bd1cae1"},"schema_version":"1.0","source":{"id":"2111.00380","kind":"arxiv","version":1}},"canonical_sha256":"71d08ab1540cca305fb515a04f72199412869611b56139b6f3e3b1b5e2fe827a","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"71d08ab1540cca305fb515a04f72199412869611b56139b6f3e3b1b5e2fe827a","first_computed_at":"2026-07-05T03:27:42.062186Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T03:27:42.062186Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"8LDNwplKt1NsBijf+tBobz7qoE98g9JgvWE51wARbQ1kRTIQ7ydw5iFjtgvVDU6gdksGXiRfzHfgj8kkNh5JDw==","signature_status":"signed_v1","signed_at":"2026-07-05T03:27:42.062718Z","signed_message":"canonical_sha256_bytes"},"source_id":"2111.00380","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:f8338c5b039c5abbf32ad795b14718a0a32cbe860e61efd839a84c0e18de2766","sha256:6cfd18892f17ac7e4ef014a88ac53fb426002c9c1e53fba54fc71316617fe76a"],"state_sha256":"ce1f01d22b5fbf0878bed8abdb61c590fa4cf1ae6b383c279df168c735868414"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"HRFRc+R8OeAmeQoY0laUZxZI8uVA83EjmVQAhzOgLw47aENbCVStE8N2FbmRoGpRUfm3Q+QiFOpe5eEmp09MBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-03T15:40:05.193503Z","bundle_sha256":"22f9ee45e327f742d79c0e68f157f27790a4a7fc2ac8ad3e659d9ac505dd7617"}}