{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:AF4JYDVNXD2M2INGDNYV3KUG5S","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":"f4e89297a144d05a1d60bba8460bbe6d0be2a651c1286d04353f6381237fdfaa","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2015-01-23T09:33:52Z","title_canon_sha256":"56422465f8793a6c8717f359375bee70857c845188a27d6c628bfa3df8b3fadd"},"schema_version":"1.0","source":{"id":"1501.05750","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1501.05750","created_at":"2026-05-18T02:28:49Z"},{"alias_kind":"arxiv_version","alias_value":"1501.05750v1","created_at":"2026-05-18T02:28:49Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1501.05750","created_at":"2026-05-18T02:28:49Z"},{"alias_kind":"pith_short_12","alias_value":"AF4JYDVNXD2M","created_at":"2026-05-18T12:29:10Z"},{"alias_kind":"pith_short_16","alias_value":"AF4JYDVNXD2M2ING","created_at":"2026-05-18T12:29:10Z"},{"alias_kind":"pith_short_8","alias_value":"AF4JYDVN","created_at":"2026-05-18T12:29:10Z"}],"graph_snapshots":[{"event_id":"sha256:2a70d3a1c12ce607013a13f0d7b62ea04cc04fd02d8f797b082a168a744574fc","target":"graph","created_at":"2026-05-18T02:28:49Z","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":"This paper presents a single-step tunable group delay phaser for spectrum sniffing. This device may be seen as a \"time filter\", where frequencies are suppressed by time separation rather than by spectral attenuation. Compared to its multiple-step counterpart, this phaser features higher processing resolution, greater simplicity, lower loss and better channel equalization, due to the smaller and channel-independent group delay swing. A three-channel example is provided for illustration.","authors_text":"Christophe Caloz, Qingfeng Zhang, Rui Wang, Tongfeng Guo, Yifan Chen","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2015-01-23T09:33:52Z","title":"Single-Step Tunable Group Delay Phaser for Real-Time Spectrum Sniffing"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1501.05750","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":"sha256:3e5d957d091450b403957904fcb36593343dd2376b0768cd74e2664ee03e27f9","target":"record","created_at":"2026-05-18T02:28:49Z","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":"f4e89297a144d05a1d60bba8460bbe6d0be2a651c1286d04353f6381237fdfaa","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2015-01-23T09:33:52Z","title_canon_sha256":"56422465f8793a6c8717f359375bee70857c845188a27d6c628bfa3df8b3fadd"},"schema_version":"1.0","source":{"id":"1501.05750","kind":"arxiv","version":1}},"canonical_sha256":"01789c0eadb8f4cd21a61b715daa86ec8d78d81926c3545b14e59f07b2439b2f","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"01789c0eadb8f4cd21a61b715daa86ec8d78d81926c3545b14e59f07b2439b2f","first_computed_at":"2026-05-18T02:28:49.085926Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:28:49.085926Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"8X3FqU89PBS0zf22y7t4X1mR8OFAQ9hPUDOC5iujIIINOrjDS6hzbqAyxWpViPTm4uozliraUmcNeKfJ8SrgCA==","signature_status":"signed_v1","signed_at":"2026-05-18T02:28:49.086288Z","signed_message":"canonical_sha256_bytes"},"source_id":"1501.05750","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:3e5d957d091450b403957904fcb36593343dd2376b0768cd74e2664ee03e27f9","sha256:2a70d3a1c12ce607013a13f0d7b62ea04cc04fd02d8f797b082a168a744574fc"],"state_sha256":"785da477c9d7e404f9fb6b2c7e210672a3e2ee85c710a9aed81051a05b5a6a88"}