{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:R4WWAVE7EFPBQQXQGX3BVG4EAY","short_pith_number":"pith:R4WWAVE7","canonical_record":{"source":{"id":"1804.00357","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2018-04-01T23:33:08Z","cross_cats_sorted":["physics.app-ph"],"title_canon_sha256":"f3051a44bd05124ce0915ab2129696133f78bc8d523a746374282623ebda7278","abstract_canon_sha256":"6605a2924ba415ff64ea25062c8cb50f2bc1efd0ff09586edc1df50e1f31c0c7"},"schema_version":"1.0"},"canonical_sha256":"8f2d60549f215e1842f035f61a9b8406386f302eedee5e78c41f50cb75b39d18","source":{"kind":"arxiv","id":"1804.00357","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1804.00357","created_at":"2026-05-18T00:02:54Z"},{"alias_kind":"arxiv_version","alias_value":"1804.00357v1","created_at":"2026-05-18T00:02:54Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1804.00357","created_at":"2026-05-18T00:02:54Z"},{"alias_kind":"pith_short_12","alias_value":"R4WWAVE7EFPB","created_at":"2026-05-18T12:32:50Z"},{"alias_kind":"pith_short_16","alias_value":"R4WWAVE7EFPBQQXQ","created_at":"2026-05-18T12:32:50Z"},{"alias_kind":"pith_short_8","alias_value":"R4WWAVE7","created_at":"2026-05-18T12:32:50Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:R4WWAVE7EFPBQQXQGX3BVG4EAY","target":"record","payload":{"canonical_record":{"source":{"id":"1804.00357","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2018-04-01T23:33:08Z","cross_cats_sorted":["physics.app-ph"],"title_canon_sha256":"f3051a44bd05124ce0915ab2129696133f78bc8d523a746374282623ebda7278","abstract_canon_sha256":"6605a2924ba415ff64ea25062c8cb50f2bc1efd0ff09586edc1df50e1f31c0c7"},"schema_version":"1.0"},"canonical_sha256":"8f2d60549f215e1842f035f61a9b8406386f302eedee5e78c41f50cb75b39d18","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:02:54.991614Z","signature_b64":"oTSzJyJv0pWsoGs5EPc1a/vLwVPIdzztk+Lr5O/AP6Tp787UCKddJL7zRqC7F8jeHRm1CbI0Ke4jFJ3+9fw/DQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"8f2d60549f215e1842f035f61a9b8406386f302eedee5e78c41f50cb75b39d18","last_reissued_at":"2026-05-18T00:02:54.990745Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:02:54.990745Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1804.00357","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":"2026-05-18T00:02:54Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"dGY+yHNBEg5m3m0sOYDI6W6Uzc7ZR5TWnEDYOFS48hitH+lDqlzUfTtbOQT98st9uUGOvWd6K1ja4SHRRjR4DQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T00:34:11.681597Z"},"content_sha256":"edaecb2da9729585ded9e3d87b1c7fc14404bd02adaa548e51cb11a0ccde6ad0","schema_version":"1.0","event_id":"sha256:edaecb2da9729585ded9e3d87b1c7fc14404bd02adaa548e51cb11a0ccde6ad0"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:R4WWAVE7EFPBQQXQGX3BVG4EAY","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Fully integrated ultra-low power Kerr comb generation","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.app-ph"],"primary_cat":"physics.optics","authors_text":"Alexander L. Gaeta, Brian Stern, Michal Lipson, Xingchen Ji, Yoshitomo Okawachi","submitted_at":"2018-04-01T23:33:08Z","abstract_excerpt":"Optical frequency combs are broadband sources that offer mutually-coherent, equidistant spectral lines with unprecedented precision in frequency and timing for an array of applications. Kerr frequency combs in microresonators require a single-frequency pump laser and have offered the promise of highly compact, scalable, and power efficient devices. Here, we realize this promise by demonstrating the first fully integrated Kerr frequency comb source through use of extremely low-loss silicon nitride waveguides that form both the microresonator and an integrated laser cavity. Our device generates "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1804.00357","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":"2026-05-18T00:02:54Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"QyxfJtxcJCJQW5ez98qYDtVaTTUEuqIzXDZ5/bGWtU4ybD9rv+TbU0tjfuBlEN3NYfV0zQEzXOFOcFH59nJzCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T00:34:11.682243Z"},"content_sha256":"4a9cac2bb3c7261742935038fe57683097a295173ef449c5fbb82aa48bfa8531","schema_version":"1.0","event_id":"sha256:4a9cac2bb3c7261742935038fe57683097a295173ef449c5fbb82aa48bfa8531"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/R4WWAVE7EFPBQQXQGX3BVG4EAY/bundle.json","state_url":"https://pith.science/pith/R4WWAVE7EFPBQQXQGX3BVG4EAY/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/R4WWAVE7EFPBQQXQGX3BVG4EAY/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":"2026-05-26T00:34:11Z","links":{"resolver":"https://pith.science/pith/R4WWAVE7EFPBQQXQGX3BVG4EAY","bundle":"https://pith.science/pith/R4WWAVE7EFPBQQXQGX3BVG4EAY/bundle.json","state":"https://pith.science/pith/R4WWAVE7EFPBQQXQGX3BVG4EAY/state.json","well_known_bundle":"https://pith.science/.well-known/pith/R4WWAVE7EFPBQQXQGX3BVG4EAY/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:R4WWAVE7EFPBQQXQGX3BVG4EAY","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":"6605a2924ba415ff64ea25062c8cb50f2bc1efd0ff09586edc1df50e1f31c0c7","cross_cats_sorted":["physics.app-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2018-04-01T23:33:08Z","title_canon_sha256":"f3051a44bd05124ce0915ab2129696133f78bc8d523a746374282623ebda7278"},"schema_version":"1.0","source":{"id":"1804.00357","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1804.00357","created_at":"2026-05-18T00:02:54Z"},{"alias_kind":"arxiv_version","alias_value":"1804.00357v1","created_at":"2026-05-18T00:02:54Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1804.00357","created_at":"2026-05-18T00:02:54Z"},{"alias_kind":"pith_short_12","alias_value":"R4WWAVE7EFPB","created_at":"2026-05-18T12:32:50Z"},{"alias_kind":"pith_short_16","alias_value":"R4WWAVE7EFPBQQXQ","created_at":"2026-05-18T12:32:50Z"},{"alias_kind":"pith_short_8","alias_value":"R4WWAVE7","created_at":"2026-05-18T12:32:50Z"}],"graph_snapshots":[{"event_id":"sha256:4a9cac2bb3c7261742935038fe57683097a295173ef449c5fbb82aa48bfa8531","target":"graph","created_at":"2026-05-18T00:02:54Z","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":"Optical frequency combs are broadband sources that offer mutually-coherent, equidistant spectral lines with unprecedented precision in frequency and timing for an array of applications. Kerr frequency combs in microresonators require a single-frequency pump laser and have offered the promise of highly compact, scalable, and power efficient devices. Here, we realize this promise by demonstrating the first fully integrated Kerr frequency comb source through use of extremely low-loss silicon nitride waveguides that form both the microresonator and an integrated laser cavity. Our device generates ","authors_text":"Alexander L. Gaeta, Brian Stern, Michal Lipson, Xingchen Ji, Yoshitomo Okawachi","cross_cats":["physics.app-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2018-04-01T23:33:08Z","title":"Fully integrated ultra-low power Kerr comb generation"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1804.00357","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:edaecb2da9729585ded9e3d87b1c7fc14404bd02adaa548e51cb11a0ccde6ad0","target":"record","created_at":"2026-05-18T00:02:54Z","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":"6605a2924ba415ff64ea25062c8cb50f2bc1efd0ff09586edc1df50e1f31c0c7","cross_cats_sorted":["physics.app-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2018-04-01T23:33:08Z","title_canon_sha256":"f3051a44bd05124ce0915ab2129696133f78bc8d523a746374282623ebda7278"},"schema_version":"1.0","source":{"id":"1804.00357","kind":"arxiv","version":1}},"canonical_sha256":"8f2d60549f215e1842f035f61a9b8406386f302eedee5e78c41f50cb75b39d18","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"8f2d60549f215e1842f035f61a9b8406386f302eedee5e78c41f50cb75b39d18","first_computed_at":"2026-05-18T00:02:54.990745Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:02:54.990745Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"oTSzJyJv0pWsoGs5EPc1a/vLwVPIdzztk+Lr5O/AP6Tp787UCKddJL7zRqC7F8jeHRm1CbI0Ke4jFJ3+9fw/DQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:02:54.991614Z","signed_message":"canonical_sha256_bytes"},"source_id":"1804.00357","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:edaecb2da9729585ded9e3d87b1c7fc14404bd02adaa548e51cb11a0ccde6ad0","sha256:4a9cac2bb3c7261742935038fe57683097a295173ef449c5fbb82aa48bfa8531"],"state_sha256":"a063afdfd5b6cd1df0e630633b241a0bbb717c8503f3a234e2bcf7be064e0f80"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"xHzdCa3TpD9Qmyn15fnDDwl0sHQu0084456r7nLCTuLSSH3wZa+0P6pIaV1xjmF+qWRg0sYWPGBTO70gRFjnCQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T00:34:11.686141Z","bundle_sha256":"88aa0ed0f524d5830d65caf7180be926d6ec5e4eb116cd815440fe3f138a7533"}}