{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:XPEVBGI6YSWNMYWXQIASQ7JNB4","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":"f659ad3a982e1362816bcb0f11d94c686e7479988e8bad17a4f4ec2ebe0c57eb","cross_cats_sorted":["physics.ins-det"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2017-06-21T03:25:22Z","title_canon_sha256":"db0704902216d303697b2e0cf15cdcaae015b6b268af61ee5c627da873b6ec0f"},"schema_version":"1.0","source":{"id":"1706.06730","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1706.06730","created_at":"2026-05-18T00:41:57Z"},{"alias_kind":"arxiv_version","alias_value":"1706.06730v1","created_at":"2026-05-18T00:41:57Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1706.06730","created_at":"2026-05-18T00:41:57Z"},{"alias_kind":"pith_short_12","alias_value":"XPEVBGI6YSWN","created_at":"2026-05-18T12:31:56Z"},{"alias_kind":"pith_short_16","alias_value":"XPEVBGI6YSWNMYWX","created_at":"2026-05-18T12:31:56Z"},{"alias_kind":"pith_short_8","alias_value":"XPEVBGI6","created_at":"2026-05-18T12:31:56Z"}],"graph_snapshots":[{"event_id":"sha256:6bf2a5879d6574329f56e422d7fcbd8080dfa2d403b273616bd0f1891b15f31e","target":"graph","created_at":"2026-05-18T00:41:57Z","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":"Ultrahigh-resolution optical strain sensors provide powerful tools in various scientific and engineering fields, ranging from long-baseline interferometers to civil and aerospace industries. Here we demonstrate an ultrahigh-resolution fibre strain sensing method by directly detecting the time-of-flight (TOF) change of the optical pulse train generated from a free-running passively mode-locked laser (MLL) frequency comb. We achieved a local strain resolution of 18 p{\\epsilon}/Hz1/2 and 1.9 p{\\epsilon}/Hz1/2 at 1 Hz and 3 kHz, respectively, with largedynamic range of >154 dB at 3 kHz. For remote","authors_text":"Chan-Gi Jeon, Dohyeon Kwon, Jungwon Kim, Kebin Shi, Shuangyou Zhang, Xing Chen, Xing Lu, Zhigang Zhang","cross_cats":["physics.ins-det"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2017-06-21T03:25:22Z","title":"Ultrasensitive, high-dynamic-range and broadband strain sensing by time-of-flight detection with femtosecond-laser frequency combs"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1706.06730","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":"sha256:68a5d782a78d2b71906c326feb698cca57cc6a45f50082ff95509e3d5c804047","target":"record","created_at":"2026-05-18T00:41:57Z","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":"f659ad3a982e1362816bcb0f11d94c686e7479988e8bad17a4f4ec2ebe0c57eb","cross_cats_sorted":["physics.ins-det"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2017-06-21T03:25:22Z","title_canon_sha256":"db0704902216d303697b2e0cf15cdcaae015b6b268af61ee5c627da873b6ec0f"},"schema_version":"1.0","source":{"id":"1706.06730","kind":"arxiv","version":1}},"canonical_sha256":"bbc950991ec4acd662d78201287d2d0f36f5d7c2f24b8ac40c3cd5047e8135e5","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"bbc950991ec4acd662d78201287d2d0f36f5d7c2f24b8ac40c3cd5047e8135e5","first_computed_at":"2026-05-18T00:41:57.024927Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:41:57.024927Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"hjHO9ezIQQS5llglxlLb8f39e5gt7aBSrubaXsyZt8q+Pm/J7Ct68fsh9DGz0xpVqdi1ygJ/iH1gWNRcFYYNBg==","signature_status":"signed_v1","signed_at":"2026-05-18T00:41:57.025461Z","signed_message":"canonical_sha256_bytes"},"source_id":"1706.06730","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:68a5d782a78d2b71906c326feb698cca57cc6a45f50082ff95509e3d5c804047","sha256:6bf2a5879d6574329f56e422d7fcbd8080dfa2d403b273616bd0f1891b15f31e"],"state_sha256":"915c091af4c9eef9657d1a17688cf279368262ff39b6b559283b5c3e1dda859f"}