{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2026:LCN6EXHZ5EWMXWPTQAJYCYSAHM","short_pith_number":"pith:LCN6EXHZ","canonical_record":{"source":{"id":"2605.30701","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.optics","submitted_at":"2026-05-29T00:50:33Z","cross_cats_sorted":[],"title_canon_sha256":"c3cf09dd66ef7b59cc00f9ae180da0cdf2c90ff2da03061e3bb31dae383bab04","abstract_canon_sha256":"94230c980d5635c4f856f3bafa28dd144d5dbd07b2d7a5210203777da0174354"},"schema_version":"1.0"},"canonical_sha256":"589be25cf9e92ccbd9f380138162403b3b3651a3cf98835dcd1721dbd290e5af","source":{"kind":"arxiv","id":"2605.30701","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2605.30701","created_at":"2026-06-01T01:03:09Z"},{"alias_kind":"arxiv_version","alias_value":"2605.30701v1","created_at":"2026-06-01T01:03:09Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2605.30701","created_at":"2026-06-01T01:03:09Z"},{"alias_kind":"pith_short_12","alias_value":"LCN6EXHZ5EWM","created_at":"2026-06-01T01:03:09Z"},{"alias_kind":"pith_short_16","alias_value":"LCN6EXHZ5EWMXWPT","created_at":"2026-06-01T01:03:09Z"},{"alias_kind":"pith_short_8","alias_value":"LCN6EXHZ","created_at":"2026-06-01T01:03:09Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2026:LCN6EXHZ5EWMXWPTQAJYCYSAHM","target":"record","payload":{"canonical_record":{"source":{"id":"2605.30701","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.optics","submitted_at":"2026-05-29T00:50:33Z","cross_cats_sorted":[],"title_canon_sha256":"c3cf09dd66ef7b59cc00f9ae180da0cdf2c90ff2da03061e3bb31dae383bab04","abstract_canon_sha256":"94230c980d5635c4f856f3bafa28dd144d5dbd07b2d7a5210203777da0174354"},"schema_version":"1.0"},"canonical_sha256":"589be25cf9e92ccbd9f380138162403b3b3651a3cf98835dcd1721dbd290e5af","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-06-01T01:03:09.284791Z","signature_b64":"KF1VEQ27TeeM0z/leK2hYTGId14ZocnDvlpOlsUGHr2aBavBHwu6+5H/DFKvcal2h/v8bjldGch+Nq7exeqdBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"589be25cf9e92ccbd9f380138162403b3b3651a3cf98835dcd1721dbd290e5af","last_reissued_at":"2026-06-01T01:03:09.284013Z","signature_status":"signed_v1","first_computed_at":"2026-06-01T01:03:09.284013Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2605.30701","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":"2026-06-01T01:03:09Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"iqmHrAYz57yESzw/SmuGsm7SAqd7lT/VqJfmZJz5YxB+HdWk/Pr3ciFPeqJlyltdQ1T/Wzx63tvYoogWI0xCCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T22:31:51.736182Z"},"content_sha256":"9d76ed8c8f7f4441aa1a6440cf605c8d7813f096a7eb7e8118e7fb968aad96b6","schema_version":"1.0","event_id":"sha256:9d76ed8c8f7f4441aa1a6440cf605c8d7813f096a7eb7e8118e7fb968aad96b6"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2026:LCN6EXHZ5EWMXWPTQAJYCYSAHM","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"High-speed mid-infrared single-photon upconversion spectrometer","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"physics.optics","authors_text":"Ben Sun, E Wu, Hairun Guo, Heping Zeng, Jianan Fang, Kun Huang, Ming Yan, Tingting Zheng, Yongyuan Chu","submitted_at":"2026-05-29T00:50:33Z","abstract_excerpt":"Sensitive and fast mid-infrared (MIR) spectroscopy is highly attractive in a variety of applications including astronomical observation, pharmaceutical synthesis, and environmental monitoring. However, the performance of conventional MIR spectrometers has long been hindered by the limited sensitivity of narrow-bandgap detectors and/or the deficient brightness of broadband light sources. Here, we devise and implement an ultra-sensitive and broadband MIR upconversion spectrometer, which integrates a supercontinuum source covering 1.5-4.2 $\\mu$m based on a silicon nitride nanophotonic waveguide. "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2605.30701","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/2605.30701/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":"2026-06-01T01:03:09Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+D0IBBmMUuLIbpYZtU+pYB/Wc9Opf21RJyeT2CHl1Ox5Xs/AoF1mfvc6YTdnB79oThh1NbUbPIwlEBJkFCV7DA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T22:31:51.736582Z"},"content_sha256":"10db0baef12d02da44510117fb24441d45c80e52976deb32fb82fd8d18f63ccf","schema_version":"1.0","event_id":"sha256:10db0baef12d02da44510117fb24441d45c80e52976deb32fb82fd8d18f63ccf"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/LCN6EXHZ5EWMXWPTQAJYCYSAHM/bundle.json","state_url":"https://pith.science/pith/LCN6EXHZ5EWMXWPTQAJYCYSAHM/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/LCN6EXHZ5EWMXWPTQAJYCYSAHM/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":"2026-06-03T22:31:51Z","links":{"resolver":"https://pith.science/pith/LCN6EXHZ5EWMXWPTQAJYCYSAHM","bundle":"https://pith.science/pith/LCN6EXHZ5EWMXWPTQAJYCYSAHM/bundle.json","state":"https://pith.science/pith/LCN6EXHZ5EWMXWPTQAJYCYSAHM/state.json","well_known_bundle":"https://pith.science/.well-known/pith/LCN6EXHZ5EWMXWPTQAJYCYSAHM/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:LCN6EXHZ5EWMXWPTQAJYCYSAHM","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":"94230c980d5635c4f856f3bafa28dd144d5dbd07b2d7a5210203777da0174354","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.optics","submitted_at":"2026-05-29T00:50:33Z","title_canon_sha256":"c3cf09dd66ef7b59cc00f9ae180da0cdf2c90ff2da03061e3bb31dae383bab04"},"schema_version":"1.0","source":{"id":"2605.30701","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2605.30701","created_at":"2026-06-01T01:03:09Z"},{"alias_kind":"arxiv_version","alias_value":"2605.30701v1","created_at":"2026-06-01T01:03:09Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2605.30701","created_at":"2026-06-01T01:03:09Z"},{"alias_kind":"pith_short_12","alias_value":"LCN6EXHZ5EWM","created_at":"2026-06-01T01:03:09Z"},{"alias_kind":"pith_short_16","alias_value":"LCN6EXHZ5EWMXWPT","created_at":"2026-06-01T01:03:09Z"},{"alias_kind":"pith_short_8","alias_value":"LCN6EXHZ","created_at":"2026-06-01T01:03:09Z"}],"graph_snapshots":[{"event_id":"sha256:10db0baef12d02da44510117fb24441d45c80e52976deb32fb82fd8d18f63ccf","target":"graph","created_at":"2026-06-01T01:03:09Z","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/2605.30701/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Sensitive and fast mid-infrared (MIR) spectroscopy is highly attractive in a variety of applications including astronomical observation, pharmaceutical synthesis, and environmental monitoring. However, the performance of conventional MIR spectrometers has long been hindered by the limited sensitivity of narrow-bandgap detectors and/or the deficient brightness of broadband light sources. Here, we devise and implement an ultra-sensitive and broadband MIR upconversion spectrometer, which integrates a supercontinuum source covering 1.5-4.2 $\\mu$m based on a silicon nitride nanophotonic waveguide. ","authors_text":"Ben Sun, E Wu, Hairun Guo, Heping Zeng, Jianan Fang, Kun Huang, Ming Yan, Tingting Zheng, Yongyuan Chu","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.optics","submitted_at":"2026-05-29T00:50:33Z","title":"High-speed mid-infrared single-photon upconversion spectrometer"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2605.30701","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":"sha256:9d76ed8c8f7f4441aa1a6440cf605c8d7813f096a7eb7e8118e7fb968aad96b6","target":"record","created_at":"2026-06-01T01:03:09Z","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":"94230c980d5635c4f856f3bafa28dd144d5dbd07b2d7a5210203777da0174354","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.optics","submitted_at":"2026-05-29T00:50:33Z","title_canon_sha256":"c3cf09dd66ef7b59cc00f9ae180da0cdf2c90ff2da03061e3bb31dae383bab04"},"schema_version":"1.0","source":{"id":"2605.30701","kind":"arxiv","version":1}},"canonical_sha256":"589be25cf9e92ccbd9f380138162403b3b3651a3cf98835dcd1721dbd290e5af","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"589be25cf9e92ccbd9f380138162403b3b3651a3cf98835dcd1721dbd290e5af","first_computed_at":"2026-06-01T01:03:09.284013Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-06-01T01:03:09.284013Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"KF1VEQ27TeeM0z/leK2hYTGId14ZocnDvlpOlsUGHr2aBavBHwu6+5H/DFKvcal2h/v8bjldGch+Nq7exeqdBQ==","signature_status":"signed_v1","signed_at":"2026-06-01T01:03:09.284791Z","signed_message":"canonical_sha256_bytes"},"source_id":"2605.30701","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:9d76ed8c8f7f4441aa1a6440cf605c8d7813f096a7eb7e8118e7fb968aad96b6","sha256:10db0baef12d02da44510117fb24441d45c80e52976deb32fb82fd8d18f63ccf"],"state_sha256":"56df212415f0e3980021259802f6063aedd94427384982895bc25d7cbb3e4b98"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"znc7IViHPW+gABJA4OB17GgTNtUEqClGpg9tDIdj6Evi6RJlTJ2kTQjqIwdHWj7/pM3BA8S0NxtKJjtTGttrDw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-03T22:31:51.738651Z","bundle_sha256":"97ef5448ea177b74594ad6fec17f4c3c51e89d62700d90d546943636a1ac6c6f"}}