{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:PGDLIR5NFJWQBCHM5OKJDCQD3K","short_pith_number":"pith:PGDLIR5N","canonical_record":{"source":{"id":"1901.06934","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2019-01-21T13:42:07Z","cross_cats_sorted":[],"title_canon_sha256":"78d7dab70661b6b90364a6ebfcabe8e4f0bfcd5e2b9f507dfc8fa3578cdc5a15","abstract_canon_sha256":"e18628501ee8c72ad69d887140efebc5dd855b2ba360d72b3a249c3a480495f8"},"schema_version":"1.0"},"canonical_sha256":"7986b447ad2a6d0088eceb94918a03dab8ab8a4a571341c9aeacf815295c7a70","source":{"kind":"arxiv","id":"1901.06934","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1901.06934","created_at":"2026-05-17T23:42:42Z"},{"alias_kind":"arxiv_version","alias_value":"1901.06934v2","created_at":"2026-05-17T23:42:42Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1901.06934","created_at":"2026-05-17T23:42:42Z"},{"alias_kind":"pith_short_12","alias_value":"PGDLIR5NFJWQ","created_at":"2026-05-18T12:33:24Z"},{"alias_kind":"pith_short_16","alias_value":"PGDLIR5NFJWQBCHM","created_at":"2026-05-18T12:33:24Z"},{"alias_kind":"pith_short_8","alias_value":"PGDLIR5N","created_at":"2026-05-18T12:33:24Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:PGDLIR5NFJWQBCHM5OKJDCQD3K","target":"record","payload":{"canonical_record":{"source":{"id":"1901.06934","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2019-01-21T13:42:07Z","cross_cats_sorted":[],"title_canon_sha256":"78d7dab70661b6b90364a6ebfcabe8e4f0bfcd5e2b9f507dfc8fa3578cdc5a15","abstract_canon_sha256":"e18628501ee8c72ad69d887140efebc5dd855b2ba360d72b3a249c3a480495f8"},"schema_version":"1.0"},"canonical_sha256":"7986b447ad2a6d0088eceb94918a03dab8ab8a4a571341c9aeacf815295c7a70","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:42:42.467564Z","signature_b64":"ZOeJwuVMLNHs3bkLyqoVbKp0md9fKBiqrfimO3atnYTYxXRRmJMBUPj2ejHyOWRS0GKWslCFILhiMXSTGJDIAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"7986b447ad2a6d0088eceb94918a03dab8ab8a4a571341c9aeacf815295c7a70","last_reissued_at":"2026-05-17T23:42:42.466974Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:42:42.466974Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1901.06934","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-17T23:42:42Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"G74MsHRtblacEpppVOkJc1o771r+qIqVE8i15tc3mo+5az44jdNKcllvGhKHtjb/BxtxzrOukpfK79F1VutyAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T17:45:42.995188Z"},"content_sha256":"21179967fe343ff478ed124d2bb3e6911bdaeb5625bd0b086ab9ddbd8a29e0e1","schema_version":"1.0","event_id":"sha256:21179967fe343ff478ed124d2bb3e6911bdaeb5625bd0b086ab9ddbd8a29e0e1"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:PGDLIR5NFJWQBCHM5OKJDCQD3K","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Wideband on-chip terahertz spectrometer based on a superconducting filterbank","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.IM","authors_text":"Akira Endo, Alejandro Pascual Laguna, Behnam Mirzaei, David J. Thoen, Jochem J. A. Baselmans, Juan Bueno, Junya Suzuki, Kenichi Karatsu, Masato Naruse, Nuria Llombart, Nuri van Marrewijk, Ozan Yurduseven, Paul P. van der Werf, Pieter J. de Visser, Robert Huiting, Sjoerd Bosma, Stephen J. C. Yates, Teun M. Klapwijk, Vignesh Murugesan","submitted_at":"2019-01-21T13:42:07Z","abstract_excerpt":"Terahertz spectrometers with a wide instantaneous frequency coverage for passive remote sensing are enormously attractive for many terahertz applications, such as astronomy, atmospheric science and security. Here we demonstrate a wide-band terahertz spectrometer based on a single superconducting chip. The chip consists of an antenna coupled to a transmission line filterbank, with a microwave kinetic inductance detector behind each filter. Using frequency division multiplexing, all detectors are read-out simultaneously creating a wide-band spectrometer with an instantaneous bandwidth of 45 GHz "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1901.06934","kind":"arxiv","version":2},"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":"2026-05-17T23:42:42Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"OdVtxjMCDGFwNVQ+YTp/bwizsu6jtSSZsKnYxYmfLKJCHkFYPMZTHUiFqOUgcsP2VWO/+P8Slw3lDjEeGB2nCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T17:45:42.995637Z"},"content_sha256":"fb8f23e46c6d72a9c4e3e130358034ab4498b9448bedb117e2d5071cebcb3f3f","schema_version":"1.0","event_id":"sha256:fb8f23e46c6d72a9c4e3e130358034ab4498b9448bedb117e2d5071cebcb3f3f"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/PGDLIR5NFJWQBCHM5OKJDCQD3K/bundle.json","state_url":"https://pith.science/pith/PGDLIR5NFJWQBCHM5OKJDCQD3K/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/PGDLIR5NFJWQBCHM5OKJDCQD3K/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":"2026-05-25T17:45:42Z","links":{"resolver":"https://pith.science/pith/PGDLIR5NFJWQBCHM5OKJDCQD3K","bundle":"https://pith.science/pith/PGDLIR5NFJWQBCHM5OKJDCQD3K/bundle.json","state":"https://pith.science/pith/PGDLIR5NFJWQBCHM5OKJDCQD3K/state.json","well_known_bundle":"https://pith.science/.well-known/pith/PGDLIR5NFJWQBCHM5OKJDCQD3K/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:PGDLIR5NFJWQBCHM5OKJDCQD3K","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":"e18628501ee8c72ad69d887140efebc5dd855b2ba360d72b3a249c3a480495f8","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2019-01-21T13:42:07Z","title_canon_sha256":"78d7dab70661b6b90364a6ebfcabe8e4f0bfcd5e2b9f507dfc8fa3578cdc5a15"},"schema_version":"1.0","source":{"id":"1901.06934","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1901.06934","created_at":"2026-05-17T23:42:42Z"},{"alias_kind":"arxiv_version","alias_value":"1901.06934v2","created_at":"2026-05-17T23:42:42Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1901.06934","created_at":"2026-05-17T23:42:42Z"},{"alias_kind":"pith_short_12","alias_value":"PGDLIR5NFJWQ","created_at":"2026-05-18T12:33:24Z"},{"alias_kind":"pith_short_16","alias_value":"PGDLIR5NFJWQBCHM","created_at":"2026-05-18T12:33:24Z"},{"alias_kind":"pith_short_8","alias_value":"PGDLIR5N","created_at":"2026-05-18T12:33:24Z"}],"graph_snapshots":[{"event_id":"sha256:fb8f23e46c6d72a9c4e3e130358034ab4498b9448bedb117e2d5071cebcb3f3f","target":"graph","created_at":"2026-05-17T23:42:42Z","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":"Terahertz spectrometers with a wide instantaneous frequency coverage for passive remote sensing are enormously attractive for many terahertz applications, such as astronomy, atmospheric science and security. Here we demonstrate a wide-band terahertz spectrometer based on a single superconducting chip. The chip consists of an antenna coupled to a transmission line filterbank, with a microwave kinetic inductance detector behind each filter. Using frequency division multiplexing, all detectors are read-out simultaneously creating a wide-band spectrometer with an instantaneous bandwidth of 45 GHz ","authors_text":"Akira Endo, Alejandro Pascual Laguna, Behnam Mirzaei, David J. Thoen, Jochem J. A. Baselmans, Juan Bueno, Junya Suzuki, Kenichi Karatsu, Masato Naruse, Nuria Llombart, Nuri van Marrewijk, Ozan Yurduseven, Paul P. van der Werf, Pieter J. de Visser, Robert Huiting, Sjoerd Bosma, Stephen J. C. Yates, Teun M. Klapwijk, Vignesh Murugesan","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2019-01-21T13:42:07Z","title":"Wideband on-chip terahertz spectrometer based on a superconducting filterbank"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1901.06934","kind":"arxiv","version":2},"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":"sha256:21179967fe343ff478ed124d2bb3e6911bdaeb5625bd0b086ab9ddbd8a29e0e1","target":"record","created_at":"2026-05-17T23:42:42Z","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":"e18628501ee8c72ad69d887140efebc5dd855b2ba360d72b3a249c3a480495f8","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2019-01-21T13:42:07Z","title_canon_sha256":"78d7dab70661b6b90364a6ebfcabe8e4f0bfcd5e2b9f507dfc8fa3578cdc5a15"},"schema_version":"1.0","source":{"id":"1901.06934","kind":"arxiv","version":2}},"canonical_sha256":"7986b447ad2a6d0088eceb94918a03dab8ab8a4a571341c9aeacf815295c7a70","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"7986b447ad2a6d0088eceb94918a03dab8ab8a4a571341c9aeacf815295c7a70","first_computed_at":"2026-05-17T23:42:42.466974Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:42:42.466974Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"ZOeJwuVMLNHs3bkLyqoVbKp0md9fKBiqrfimO3atnYTYxXRRmJMBUPj2ejHyOWRS0GKWslCFILhiMXSTGJDIAA==","signature_status":"signed_v1","signed_at":"2026-05-17T23:42:42.467564Z","signed_message":"canonical_sha256_bytes"},"source_id":"1901.06934","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:21179967fe343ff478ed124d2bb3e6911bdaeb5625bd0b086ab9ddbd8a29e0e1","sha256:fb8f23e46c6d72a9c4e3e130358034ab4498b9448bedb117e2d5071cebcb3f3f"],"state_sha256":"b6b236ab705d651ef4140b485460c92f52f785bd836d232b152938047b415feb"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Fmo6pcxlsg30Bv5FEublUDesV3KprL48ouroNj4cNb6Ac4KmdNPyWHWmqGf/3/bTQrFlSlz3/4ufrae4vgLsDA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-25T17:45:42.998926Z","bundle_sha256":"6239c4470331f701279cb17148f5018c88259eebe34dca5d3e05afe1779fa548"}}