{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2023:CCXBH4YMUUUCMRA2BLISMXHL4I","short_pith_number":"pith:CCXBH4YM","canonical_record":{"source":{"id":"2306.09027","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2023-06-15T10:37:11Z","cross_cats_sorted":["physics.app-ph"],"title_canon_sha256":"2708779b052ff4e26da18dd13868ab4dde7022c9707333089384dc414dfe74ec","abstract_canon_sha256":"f05435f096cf8c2431e203896a1c53a23c07590559ad9d90500b57d1921f8c03"},"schema_version":"1.0"},"canonical_sha256":"10ae13f30ca52826441a0ad1265cebe22d1eba9883476783e2cc99c0dae6f26d","source":{"kind":"arxiv","id":"2306.09027","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2306.09027","created_at":"2026-07-05T06:21:07Z"},{"alias_kind":"arxiv_version","alias_value":"2306.09027v1","created_at":"2026-07-05T06:21:07Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2306.09027","created_at":"2026-07-05T06:21:07Z"},{"alias_kind":"pith_short_12","alias_value":"CCXBH4YMUUUC","created_at":"2026-07-05T06:21:07Z"},{"alias_kind":"pith_short_16","alias_value":"CCXBH4YMUUUCMRA2","created_at":"2026-07-05T06:21:07Z"},{"alias_kind":"pith_short_8","alias_value":"CCXBH4YM","created_at":"2026-07-05T06:21:07Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2023:CCXBH4YMUUUCMRA2BLISMXHL4I","target":"record","payload":{"canonical_record":{"source":{"id":"2306.09027","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2023-06-15T10:37:11Z","cross_cats_sorted":["physics.app-ph"],"title_canon_sha256":"2708779b052ff4e26da18dd13868ab4dde7022c9707333089384dc414dfe74ec","abstract_canon_sha256":"f05435f096cf8c2431e203896a1c53a23c07590559ad9d90500b57d1921f8c03"},"schema_version":"1.0"},"canonical_sha256":"10ae13f30ca52826441a0ad1265cebe22d1eba9883476783e2cc99c0dae6f26d","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T06:21:07.730782Z","signature_b64":"knBYoJmr8OppariCwL8UWo7BUnxKPZSdA4xbFjc4coKPPrapIX/oocFj6zvF39VOyKIOk/AVCOb23YkmSAGhCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"10ae13f30ca52826441a0ad1265cebe22d1eba9883476783e2cc99c0dae6f26d","last_reissued_at":"2026-07-05T06:21:07.730328Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T06:21:07.730328Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2306.09027","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":"2026-07-05T06:21:07Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Es5OpFNgtpzzpZZlvw2ZHcxX7Sh3GYDxrnMrYBJRyLCcHIsV0gRWJcEqfe/FyF4tXWoyR59PoB1y26HTSuprDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-07T13:53:41.302386Z"},"content_sha256":"002ad284cfb5e7a85db85c3172fd6de8e03cd79e4b9138e64e820135bb8a7664","schema_version":"1.0","event_id":"sha256:002ad284cfb5e7a85db85c3172fd6de8e03cd79e4b9138e64e820135bb8a7664"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2023:CCXBH4YMUUUCMRA2BLISMXHL4I","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Ultra-low-loss optical interconnect enabled by topological unidirectional guided resonance","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.app-ph"],"primary_cat":"physics.optics","authors_text":"Chao Peng, Feifan Wang, Haoran Wang, Xiaoyu Zhang, Xuefan Yin, Yi Zuo, Yuefeng Hu, Zihao Chen, Zixuan Zhang","submitted_at":"2023-06-15T10:37:11Z","abstract_excerpt":"Grating couplers that interconnect photonic chips to off-chip components are of essential importance for various optoelectronics applications. Despite numerous efforts in past decades, existing grating couplers still suffer from poor energy efficiency and thus hinder photonic integration toward a larger scale. Here, we theoretically propose and experimentally demonstrate a method to achieve ultra-low-loss grating coupler by employing topological unidirectional guided resonances (UGRs). Leveraging the unidirectional emitting nature of UGRs, the useless downward radiation is greatly suppressed w"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2306.09027","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/2306.09027/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":"2026-07-05T06:21:07Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"fu4q9IkY+JhK5EFqXUSM2M6ww6/YFVDxjWKRaSbXP++Lh9sl5AEJDlGVQdmpHcLxPSYKozER7vSO9f4O9ZHoDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-07T13:53:41.302752Z"},"content_sha256":"d8bbb224c86427af210f4440d16ba619c64be0ef8e550fa2ecaa9012396a4ad1","schema_version":"1.0","event_id":"sha256:d8bbb224c86427af210f4440d16ba619c64be0ef8e550fa2ecaa9012396a4ad1"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/CCXBH4YMUUUCMRA2BLISMXHL4I/bundle.json","state_url":"https://pith.science/pith/CCXBH4YMUUUCMRA2BLISMXHL4I/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/CCXBH4YMUUUCMRA2BLISMXHL4I/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":"2026-07-07T13:53:41Z","links":{"resolver":"https://pith.science/pith/CCXBH4YMUUUCMRA2BLISMXHL4I","bundle":"https://pith.science/pith/CCXBH4YMUUUCMRA2BLISMXHL4I/bundle.json","state":"https://pith.science/pith/CCXBH4YMUUUCMRA2BLISMXHL4I/state.json","well_known_bundle":"https://pith.science/.well-known/pith/CCXBH4YMUUUCMRA2BLISMXHL4I/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2023:CCXBH4YMUUUCMRA2BLISMXHL4I","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":"f05435f096cf8c2431e203896a1c53a23c07590559ad9d90500b57d1921f8c03","cross_cats_sorted":["physics.app-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2023-06-15T10:37:11Z","title_canon_sha256":"2708779b052ff4e26da18dd13868ab4dde7022c9707333089384dc414dfe74ec"},"schema_version":"1.0","source":{"id":"2306.09027","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2306.09027","created_at":"2026-07-05T06:21:07Z"},{"alias_kind":"arxiv_version","alias_value":"2306.09027v1","created_at":"2026-07-05T06:21:07Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2306.09027","created_at":"2026-07-05T06:21:07Z"},{"alias_kind":"pith_short_12","alias_value":"CCXBH4YMUUUC","created_at":"2026-07-05T06:21:07Z"},{"alias_kind":"pith_short_16","alias_value":"CCXBH4YMUUUCMRA2","created_at":"2026-07-05T06:21:07Z"},{"alias_kind":"pith_short_8","alias_value":"CCXBH4YM","created_at":"2026-07-05T06:21:07Z"}],"graph_snapshots":[{"event_id":"sha256:d8bbb224c86427af210f4440d16ba619c64be0ef8e550fa2ecaa9012396a4ad1","target":"graph","created_at":"2026-07-05T06:21:07Z","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/2306.09027/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Grating couplers that interconnect photonic chips to off-chip components are of essential importance for various optoelectronics applications. Despite numerous efforts in past decades, existing grating couplers still suffer from poor energy efficiency and thus hinder photonic integration toward a larger scale. Here, we theoretically propose and experimentally demonstrate a method to achieve ultra-low-loss grating coupler by employing topological unidirectional guided resonances (UGRs). Leveraging the unidirectional emitting nature of UGRs, the useless downward radiation is greatly suppressed w","authors_text":"Chao Peng, Feifan Wang, Haoran Wang, Xiaoyu Zhang, Xuefan Yin, Yi Zuo, Yuefeng Hu, Zihao Chen, Zixuan Zhang","cross_cats":["physics.app-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2023-06-15T10:37:11Z","title":"Ultra-low-loss optical interconnect enabled by topological unidirectional guided resonance"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2306.09027","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":"sha256:002ad284cfb5e7a85db85c3172fd6de8e03cd79e4b9138e64e820135bb8a7664","target":"record","created_at":"2026-07-05T06:21:07Z","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":"f05435f096cf8c2431e203896a1c53a23c07590559ad9d90500b57d1921f8c03","cross_cats_sorted":["physics.app-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2023-06-15T10:37:11Z","title_canon_sha256":"2708779b052ff4e26da18dd13868ab4dde7022c9707333089384dc414dfe74ec"},"schema_version":"1.0","source":{"id":"2306.09027","kind":"arxiv","version":1}},"canonical_sha256":"10ae13f30ca52826441a0ad1265cebe22d1eba9883476783e2cc99c0dae6f26d","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"10ae13f30ca52826441a0ad1265cebe22d1eba9883476783e2cc99c0dae6f26d","first_computed_at":"2026-07-05T06:21:07.730328Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T06:21:07.730328Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"knBYoJmr8OppariCwL8UWo7BUnxKPZSdA4xbFjc4coKPPrapIX/oocFj6zvF39VOyKIOk/AVCOb23YkmSAGhCw==","signature_status":"signed_v1","signed_at":"2026-07-05T06:21:07.730782Z","signed_message":"canonical_sha256_bytes"},"source_id":"2306.09027","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:002ad284cfb5e7a85db85c3172fd6de8e03cd79e4b9138e64e820135bb8a7664","sha256:d8bbb224c86427af210f4440d16ba619c64be0ef8e550fa2ecaa9012396a4ad1"],"state_sha256":"94e4d38ca286340b89c897bcedbe5ed02f0c2611a9fdaf7a427d8e9a8b1226c2"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"mBPnSq0PkPhnFWullsm4h+wKSl/GXEQICAewjMiwsWo8xeoFQDFy+ZwVAXqEiRiQ+5uckDEJChgFM+wPhu9DDQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-07T13:53:41.304666Z","bundle_sha256":"1f8ef3eb7a57fd352e9d2b72aab2649df2419f86c4e2bac115bd91b583946b9f"}}