{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:ORRDMCWPV76ZHANVMVT4WMXZIE","short_pith_number":"pith:ORRDMCWP","canonical_record":{"source":{"id":"1904.13124","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.optics","submitted_at":"2019-04-30T09:44:35Z","cross_cats_sorted":[],"title_canon_sha256":"ef0e2ce7ee9605d18a0e7622b7bdc015822bd8d3755982e95a7af1121c491337","abstract_canon_sha256":"6d42171b6e1e6d2e322476d947589e1344af97b18aee95c289747ba573646526"},"schema_version":"1.0"},"canonical_sha256":"7462360acfaffd9381b56567cb32f9413d21ee785b5aef00fef307c60830585b","source":{"kind":"arxiv","id":"1904.13124","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1904.13124","created_at":"2026-05-17T23:47:22Z"},{"alias_kind":"arxiv_version","alias_value":"1904.13124v1","created_at":"2026-05-17T23:47:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1904.13124","created_at":"2026-05-17T23:47:22Z"},{"alias_kind":"pith_short_12","alias_value":"ORRDMCWPV76Z","created_at":"2026-05-18T12:33:24Z"},{"alias_kind":"pith_short_16","alias_value":"ORRDMCWPV76ZHANV","created_at":"2026-05-18T12:33:24Z"},{"alias_kind":"pith_short_8","alias_value":"ORRDMCWP","created_at":"2026-05-18T12:33:24Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:ORRDMCWPV76ZHANVMVT4WMXZIE","target":"record","payload":{"canonical_record":{"source":{"id":"1904.13124","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.optics","submitted_at":"2019-04-30T09:44:35Z","cross_cats_sorted":[],"title_canon_sha256":"ef0e2ce7ee9605d18a0e7622b7bdc015822bd8d3755982e95a7af1121c491337","abstract_canon_sha256":"6d42171b6e1e6d2e322476d947589e1344af97b18aee95c289747ba573646526"},"schema_version":"1.0"},"canonical_sha256":"7462360acfaffd9381b56567cb32f9413d21ee785b5aef00fef307c60830585b","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:47:22.099453Z","signature_b64":"MqQ07HOzVrkw1JAEd7mxbEiuoTIg/OUd0l72WCmf6bAz0KxT3ySGoF0p/DcEgTASCD77o6hSxUg0fueRdDRNAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"7462360acfaffd9381b56567cb32f9413d21ee785b5aef00fef307c60830585b","last_reissued_at":"2026-05-17T23:47:22.099043Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:47:22.099043Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1904.13124","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":"2026-05-17T23:47:22Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+spxS8pC5UimXO7YLCokj4vTxRkFMof0IKOY4hwoqh1HuWk5ABqAZa8bwpX/rJLN7V/zWbfKe+3MxpCdKB5xBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-09T11:11:20.846408Z"},"content_sha256":"3fef24739a51d1e8f421ae8da42b334c9be1dce6515ac849e6015e6e145ca4a5","schema_version":"1.0","event_id":"sha256:3fef24739a51d1e8f421ae8da42b334c9be1dce6515ac849e6015e6e145ca4a5"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:ORRDMCWPV76ZHANVMVT4WMXZIE","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"QCL-based frequency metrology from the mid-infrared to the THz range: a review","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"physics.optics","authors_text":"Francesco Cappelli, Luigi Consolino, Mario Siciliani de Cumis, Paolo De Natale","submitted_at":"2019-04-30T09:44:35Z","abstract_excerpt":"Quantum cascade lasers (QCLs) are becoming a key tool for plenty of applications, from the mid-infrared (mid-IR) to the THz range. Progress in related areas, such as the development of ultra-low-loss crystalline microresonators, optical frequency standards, and optical fiber networks for time and frequency dissemination, is paving the way for unprecedented applications in many fields. For most demanding applications, a thorough control of QCLs emission must be achieved. In the last few years, QCLs unique spectral features have been unveiled, while multifrequency QCLs have been demonstrated. Ul"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1904.13124","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":"2026-05-17T23:47:22Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"yfhFdAGve/DLOitfH7tlLlpxUU3CtQRVR/eGwNK7YhW6VfJ8hfxCz5AkzTd102A4E/z9ZIpJvyQFGvYAbbZrAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-09T11:11:20.846754Z"},"content_sha256":"57ef1e341ad4ddbd1dad10ebf5a385e7f02faccf819edcea2ada0bc038ac86c6","schema_version":"1.0","event_id":"sha256:57ef1e341ad4ddbd1dad10ebf5a385e7f02faccf819edcea2ada0bc038ac86c6"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/ORRDMCWPV76ZHANVMVT4WMXZIE/bundle.json","state_url":"https://pith.science/pith/ORRDMCWPV76ZHANVMVT4WMXZIE/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/ORRDMCWPV76ZHANVMVT4WMXZIE/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":"2026-06-09T11:11:20Z","links":{"resolver":"https://pith.science/pith/ORRDMCWPV76ZHANVMVT4WMXZIE","bundle":"https://pith.science/pith/ORRDMCWPV76ZHANVMVT4WMXZIE/bundle.json","state":"https://pith.science/pith/ORRDMCWPV76ZHANVMVT4WMXZIE/state.json","well_known_bundle":"https://pith.science/.well-known/pith/ORRDMCWPV76ZHANVMVT4WMXZIE/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:ORRDMCWPV76ZHANVMVT4WMXZIE","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":"6d42171b6e1e6d2e322476d947589e1344af97b18aee95c289747ba573646526","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.optics","submitted_at":"2019-04-30T09:44:35Z","title_canon_sha256":"ef0e2ce7ee9605d18a0e7622b7bdc015822bd8d3755982e95a7af1121c491337"},"schema_version":"1.0","source":{"id":"1904.13124","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1904.13124","created_at":"2026-05-17T23:47:22Z"},{"alias_kind":"arxiv_version","alias_value":"1904.13124v1","created_at":"2026-05-17T23:47:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1904.13124","created_at":"2026-05-17T23:47:22Z"},{"alias_kind":"pith_short_12","alias_value":"ORRDMCWPV76Z","created_at":"2026-05-18T12:33:24Z"},{"alias_kind":"pith_short_16","alias_value":"ORRDMCWPV76ZHANV","created_at":"2026-05-18T12:33:24Z"},{"alias_kind":"pith_short_8","alias_value":"ORRDMCWP","created_at":"2026-05-18T12:33:24Z"}],"graph_snapshots":[{"event_id":"sha256:57ef1e341ad4ddbd1dad10ebf5a385e7f02faccf819edcea2ada0bc038ac86c6","target":"graph","created_at":"2026-05-17T23:47:22Z","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":"Quantum cascade lasers (QCLs) are becoming a key tool for plenty of applications, from the mid-infrared (mid-IR) to the THz range. Progress in related areas, such as the development of ultra-low-loss crystalline microresonators, optical frequency standards, and optical fiber networks for time and frequency dissemination, is paving the way for unprecedented applications in many fields. For most demanding applications, a thorough control of QCLs emission must be achieved. In the last few years, QCLs unique spectral features have been unveiled, while multifrequency QCLs have been demonstrated. Ul","authors_text":"Francesco Cappelli, Luigi Consolino, Mario Siciliani de Cumis, Paolo De Natale","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.optics","submitted_at":"2019-04-30T09:44:35Z","title":"QCL-based frequency metrology from the mid-infrared to the THz range: a review"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1904.13124","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":"sha256:3fef24739a51d1e8f421ae8da42b334c9be1dce6515ac849e6015e6e145ca4a5","target":"record","created_at":"2026-05-17T23:47:22Z","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":"6d42171b6e1e6d2e322476d947589e1344af97b18aee95c289747ba573646526","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.optics","submitted_at":"2019-04-30T09:44:35Z","title_canon_sha256":"ef0e2ce7ee9605d18a0e7622b7bdc015822bd8d3755982e95a7af1121c491337"},"schema_version":"1.0","source":{"id":"1904.13124","kind":"arxiv","version":1}},"canonical_sha256":"7462360acfaffd9381b56567cb32f9413d21ee785b5aef00fef307c60830585b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"7462360acfaffd9381b56567cb32f9413d21ee785b5aef00fef307c60830585b","first_computed_at":"2026-05-17T23:47:22.099043Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:47:22.099043Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"MqQ07HOzVrkw1JAEd7mxbEiuoTIg/OUd0l72WCmf6bAz0KxT3ySGoF0p/DcEgTASCD77o6hSxUg0fueRdDRNAA==","signature_status":"signed_v1","signed_at":"2026-05-17T23:47:22.099453Z","signed_message":"canonical_sha256_bytes"},"source_id":"1904.13124","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:3fef24739a51d1e8f421ae8da42b334c9be1dce6515ac849e6015e6e145ca4a5","sha256:57ef1e341ad4ddbd1dad10ebf5a385e7f02faccf819edcea2ada0bc038ac86c6"],"state_sha256":"56cfe06cfe4850d7c9a91bd1fd8f5fc15316f5b222c267cf8e70b71cfdbc7e4b"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"tt/0m5s78U9Y3UurFJFWgrSZcmMNjx+jxFKvyi5tgIqEX2KDli11ZqoiF66NzWelEQLZ/44tkxXNaPTcalXlBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-09T11:11:20.848543Z","bundle_sha256":"3c1ffedd982552a18c2aa62e75bed71daa12f0dcf7edcdfc207e01a2ec0694e0"}}