{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:UNE4WZYNN4O6XIQPOMWAEHYJFR","short_pith_number":"pith:UNE4WZYN","canonical_record":{"source":{"id":"1502.05444","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2015-02-18T23:52:09Z","cross_cats_sorted":[],"title_canon_sha256":"3004b2643aa760f33f0256415b34d100c22339fd40ef27c9f36dc42bc52f1df5","abstract_canon_sha256":"dec33e1acd6d9cc8ea224cdab3ec312d06d5e17a9a7ccdd0ac8ed10d0772a194"},"schema_version":"1.0"},"canonical_sha256":"a349cb670d6f1deba20f732c021f092c52a31db156c5eed770ef992e5f6d2117","source":{"kind":"arxiv","id":"1502.05444","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1502.05444","created_at":"2026-05-18T02:26:46Z"},{"alias_kind":"arxiv_version","alias_value":"1502.05444v1","created_at":"2026-05-18T02:26:46Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1502.05444","created_at":"2026-05-18T02:26:46Z"},{"alias_kind":"pith_short_12","alias_value":"UNE4WZYNN4O6","created_at":"2026-05-18T12:29:44Z"},{"alias_kind":"pith_short_16","alias_value":"UNE4WZYNN4O6XIQP","created_at":"2026-05-18T12:29:44Z"},{"alias_kind":"pith_short_8","alias_value":"UNE4WZYN","created_at":"2026-05-18T12:29:44Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:UNE4WZYNN4O6XIQPOMWAEHYJFR","target":"record","payload":{"canonical_record":{"source":{"id":"1502.05444","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2015-02-18T23:52:09Z","cross_cats_sorted":[],"title_canon_sha256":"3004b2643aa760f33f0256415b34d100c22339fd40ef27c9f36dc42bc52f1df5","abstract_canon_sha256":"dec33e1acd6d9cc8ea224cdab3ec312d06d5e17a9a7ccdd0ac8ed10d0772a194"},"schema_version":"1.0"},"canonical_sha256":"a349cb670d6f1deba20f732c021f092c52a31db156c5eed770ef992e5f6d2117","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:26:46.522110Z","signature_b64":"io/S5R85/PpdtIzj+kBur2RUqExXFUaOWu1TvmCEE1XTsm1LupJN9GbpibwFJJ8qpuPT0EEMtCT8Dy5ePHvVCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a349cb670d6f1deba20f732c021f092c52a31db156c5eed770ef992e5f6d2117","last_reissued_at":"2026-05-18T02:26:46.521727Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:26:46.521727Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1502.05444","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":"2026-05-18T02:26:46Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"U77gmL8996XkHLczVr9EcZxmmXYGZ7muSKhUyRtqZ9cbFE15wcHYE1vHwUuiZEIcPzKJf4uzQpVyukP6D1itCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T03:28:54.326877Z"},"content_sha256":"46f617b4490379217084ff30d12ee99a9f77ec267474fcd6c364a494ac94e3e7","schema_version":"1.0","event_id":"sha256:46f617b4490379217084ff30d12ee99a9f77ec267474fcd6c364a494ac94e3e7"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:UNE4WZYNN4O6XIQPOMWAEHYJFR","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A low-phase-noise 18 GHz Kerr frequency microcomb phase-locked over 65 THz","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.optics","authors_text":"C. W. Wong, D.-L. Kwong, H. Zhou, J. Yang, M. Yu, S.-W. Huang","submitted_at":"2015-02-18T23:52:09Z","abstract_excerpt":"Laser frequency combs are coherent light sources that simultaneously provide pristine frequency spacings for precision metrology and the fundamental basis for ultrafast and attosecond sciences. Recently, nonlinear parametric conversion in high-Q microresonators has been suggested as an alternative platform for optical frequency combs, though almost all in 100 GHz frequencies or more. Here we report a low-phase-noise on-chip Kerr frequency comb with mode spacing compatible with high-speed silicon optoelectronics. The waveguide cross-section of the silicon nitride spiral resonator is designed to"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1502.05444","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":"2026-05-18T02:26:46Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"oKfFuRjKMHRIsp+kjqEAECiHNEQ7c5oV+xirQeJCCGxal+gAnCQ1OrzRlXfpqkKg/0pFvUTValcllaejgTQQBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T03:28:54.327223Z"},"content_sha256":"d1d0f0fd74a267bf69c442f7bb99b93efae2e00065aeb8bf0ed918eea2939b44","schema_version":"1.0","event_id":"sha256:d1d0f0fd74a267bf69c442f7bb99b93efae2e00065aeb8bf0ed918eea2939b44"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/UNE4WZYNN4O6XIQPOMWAEHYJFR/bundle.json","state_url":"https://pith.science/pith/UNE4WZYNN4O6XIQPOMWAEHYJFR/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/UNE4WZYNN4O6XIQPOMWAEHYJFR/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":"2026-06-01T03:28:54Z","links":{"resolver":"https://pith.science/pith/UNE4WZYNN4O6XIQPOMWAEHYJFR","bundle":"https://pith.science/pith/UNE4WZYNN4O6XIQPOMWAEHYJFR/bundle.json","state":"https://pith.science/pith/UNE4WZYNN4O6XIQPOMWAEHYJFR/state.json","well_known_bundle":"https://pith.science/.well-known/pith/UNE4WZYNN4O6XIQPOMWAEHYJFR/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:UNE4WZYNN4O6XIQPOMWAEHYJFR","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":"dec33e1acd6d9cc8ea224cdab3ec312d06d5e17a9a7ccdd0ac8ed10d0772a194","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2015-02-18T23:52:09Z","title_canon_sha256":"3004b2643aa760f33f0256415b34d100c22339fd40ef27c9f36dc42bc52f1df5"},"schema_version":"1.0","source":{"id":"1502.05444","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1502.05444","created_at":"2026-05-18T02:26:46Z"},{"alias_kind":"arxiv_version","alias_value":"1502.05444v1","created_at":"2026-05-18T02:26:46Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1502.05444","created_at":"2026-05-18T02:26:46Z"},{"alias_kind":"pith_short_12","alias_value":"UNE4WZYNN4O6","created_at":"2026-05-18T12:29:44Z"},{"alias_kind":"pith_short_16","alias_value":"UNE4WZYNN4O6XIQP","created_at":"2026-05-18T12:29:44Z"},{"alias_kind":"pith_short_8","alias_value":"UNE4WZYN","created_at":"2026-05-18T12:29:44Z"}],"graph_snapshots":[{"event_id":"sha256:d1d0f0fd74a267bf69c442f7bb99b93efae2e00065aeb8bf0ed918eea2939b44","target":"graph","created_at":"2026-05-18T02:26:46Z","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":"Laser frequency combs are coherent light sources that simultaneously provide pristine frequency spacings for precision metrology and the fundamental basis for ultrafast and attosecond sciences. Recently, nonlinear parametric conversion in high-Q microresonators has been suggested as an alternative platform for optical frequency combs, though almost all in 100 GHz frequencies or more. Here we report a low-phase-noise on-chip Kerr frequency comb with mode spacing compatible with high-speed silicon optoelectronics. The waveguide cross-section of the silicon nitride spiral resonator is designed to","authors_text":"C. W. Wong, D.-L. Kwong, H. Zhou, J. Yang, M. Yu, S.-W. Huang","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2015-02-18T23:52:09Z","title":"A low-phase-noise 18 GHz Kerr frequency microcomb phase-locked over 65 THz"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1502.05444","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":"sha256:46f617b4490379217084ff30d12ee99a9f77ec267474fcd6c364a494ac94e3e7","target":"record","created_at":"2026-05-18T02:26:46Z","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":"dec33e1acd6d9cc8ea224cdab3ec312d06d5e17a9a7ccdd0ac8ed10d0772a194","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2015-02-18T23:52:09Z","title_canon_sha256":"3004b2643aa760f33f0256415b34d100c22339fd40ef27c9f36dc42bc52f1df5"},"schema_version":"1.0","source":{"id":"1502.05444","kind":"arxiv","version":1}},"canonical_sha256":"a349cb670d6f1deba20f732c021f092c52a31db156c5eed770ef992e5f6d2117","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a349cb670d6f1deba20f732c021f092c52a31db156c5eed770ef992e5f6d2117","first_computed_at":"2026-05-18T02:26:46.521727Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:26:46.521727Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"io/S5R85/PpdtIzj+kBur2RUqExXFUaOWu1TvmCEE1XTsm1LupJN9GbpibwFJJ8qpuPT0EEMtCT8Dy5ePHvVCw==","signature_status":"signed_v1","signed_at":"2026-05-18T02:26:46.522110Z","signed_message":"canonical_sha256_bytes"},"source_id":"1502.05444","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:46f617b4490379217084ff30d12ee99a9f77ec267474fcd6c364a494ac94e3e7","sha256:d1d0f0fd74a267bf69c442f7bb99b93efae2e00065aeb8bf0ed918eea2939b44"],"state_sha256":"3e202874e106f77a4287d8f03aa65f70c0b805fa55a75c1892664ac6468f335f"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"LnGrLBQvLPK59ox84a5W8xGgeu01znucMeHV1CqMsnedXkgppd8tA3Mnq5bXlrl3fdRf/2O/RXsn0inmnXIbDw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-01T03:28:54.329459Z","bundle_sha256":"33988066e9fdabda92671cff5beb900c6ca0ab04ae64f926603a39f355cb57db"}}