{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2024:MQR3DOLYJT3JLF7LG2Z4LSHBFL","short_pith_number":"pith:MQR3DOLY","canonical_record":{"source":{"id":"2407.10273","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2024-07-14T17:05:27Z","cross_cats_sorted":["physics.comp-ph"],"title_canon_sha256":"9221e3bad0460e84f9dbaf9d21182c48f34e70b059eead9769cb3f76cf897cfc","abstract_canon_sha256":"8b4fc4eb2144b7328a42746ca1d0a2809f15c199889f8a3c22aedb2af64d716d"},"schema_version":"1.0"},"canonical_sha256":"6423b1b9784cf69597eb36b3c5c8e12ada269b02cb32cdcf5d64c6d6e07e7e37","source":{"kind":"arxiv","id":"2407.10273","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2407.10273","created_at":"2026-07-05T09:43:31Z"},{"alias_kind":"arxiv_version","alias_value":"2407.10273v2","created_at":"2026-07-05T09:43:31Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2407.10273","created_at":"2026-07-05T09:43:31Z"},{"alias_kind":"pith_short_12","alias_value":"MQR3DOLYJT3J","created_at":"2026-07-05T09:43:31Z"},{"alias_kind":"pith_short_16","alias_value":"MQR3DOLYJT3JLF7L","created_at":"2026-07-05T09:43:31Z"},{"alias_kind":"pith_short_8","alias_value":"MQR3DOLY","created_at":"2026-07-05T09:43:31Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2024:MQR3DOLYJT3JLF7LG2Z4LSHBFL","target":"record","payload":{"canonical_record":{"source":{"id":"2407.10273","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2024-07-14T17:05:27Z","cross_cats_sorted":["physics.comp-ph"],"title_canon_sha256":"9221e3bad0460e84f9dbaf9d21182c48f34e70b059eead9769cb3f76cf897cfc","abstract_canon_sha256":"8b4fc4eb2144b7328a42746ca1d0a2809f15c199889f8a3c22aedb2af64d716d"},"schema_version":"1.0"},"canonical_sha256":"6423b1b9784cf69597eb36b3c5c8e12ada269b02cb32cdcf5d64c6d6e07e7e37","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T09:43:31.592237Z","signature_b64":"fkVNBHTiwIAEThGKIlFn3HG0ig5v0tTDj2XaLkUaChoOkdb/F2BYBkUM06ynVmPwE423OwtkS98f0Wzl1KFcCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"6423b1b9784cf69597eb36b3c5c8e12ada269b02cb32cdcf5d64c6d6e07e7e37","last_reissued_at":"2026-07-05T09:43:31.591752Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T09:43:31.591752Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2407.10273","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":"2026-07-05T09:43:31Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"5LTHZnPcQ4hqILufxC+EiDX++4TjOkW8TSyjLfCnRh1P6pzLwuijYYaSqY6vnZjaCnoyYMgp2iXPEGJsrqMlAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-26T18:14:04.611889Z"},"content_sha256":"3acad601d42c81835b5f3f939834fb401e239b234ea6134b1312d77947274de1","schema_version":"1.0","event_id":"sha256:3acad601d42c81835b5f3f939834fb401e239b234ea6134b1312d77947274de1"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2024:MQR3DOLYJT3JLF7LG2Z4LSHBFL","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Quantized Inverse Design for Photonic Integrated Circuits","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.comp-ph"],"primary_cat":"physics.optics","authors_text":"Bodo Rosenhahn, Fabian Hartmann, Frederik Schubert, J\\\"orn Ostermann, Konrad Bethmann, Marco Munderloh, Reinhard Caspary, Yannik Mahlau","submitted_at":"2024-07-14T17:05:27Z","abstract_excerpt":"The inverse design of photonic integrated circuits (PICs) presents distinctive computational challenges, including their large memory requirements. Advancements in the two-photon polymerization (2PP) fabrication process introduce additional complexity, necessitating the development of more flexible optimization algorithms to enable the creation of multi-material 3D structures with unique properties. This paper presents a memory efficient reverse-mode automatic differentiation framework for finite-difference time-domain (FDTD) simulations that is able to handle complex constraints arising from "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2407.10273","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2407.10273/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":"2026-07-05T09:43:31Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"WZZpRNvEtO6TtJ1E+XJ7UbVPz8iurSKBBl0hy4G5/9y6T3H/iNalxIig9OjcHYRwH0yDSxm+uTC2w9cCCnYzBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-26T18:14:04.612253Z"},"content_sha256":"1e2f3f8ea3e889eec0564654d7dcda19a0e4b2ec04b22679a400f8e6cacd8be3","schema_version":"1.0","event_id":"sha256:1e2f3f8ea3e889eec0564654d7dcda19a0e4b2ec04b22679a400f8e6cacd8be3"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/MQR3DOLYJT3JLF7LG2Z4LSHBFL/bundle.json","state_url":"https://pith.science/pith/MQR3DOLYJT3JLF7LG2Z4LSHBFL/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/MQR3DOLYJT3JLF7LG2Z4LSHBFL/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":"2026-07-26T18:14:04Z","links":{"resolver":"https://pith.science/pith/MQR3DOLYJT3JLF7LG2Z4LSHBFL","bundle":"https://pith.science/pith/MQR3DOLYJT3JLF7LG2Z4LSHBFL/bundle.json","state":"https://pith.science/pith/MQR3DOLYJT3JLF7LG2Z4LSHBFL/state.json","well_known_bundle":"https://pith.science/.well-known/pith/MQR3DOLYJT3JLF7LG2Z4LSHBFL/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2024:MQR3DOLYJT3JLF7LG2Z4LSHBFL","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":"8b4fc4eb2144b7328a42746ca1d0a2809f15c199889f8a3c22aedb2af64d716d","cross_cats_sorted":["physics.comp-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2024-07-14T17:05:27Z","title_canon_sha256":"9221e3bad0460e84f9dbaf9d21182c48f34e70b059eead9769cb3f76cf897cfc"},"schema_version":"1.0","source":{"id":"2407.10273","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2407.10273","created_at":"2026-07-05T09:43:31Z"},{"alias_kind":"arxiv_version","alias_value":"2407.10273v2","created_at":"2026-07-05T09:43:31Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2407.10273","created_at":"2026-07-05T09:43:31Z"},{"alias_kind":"pith_short_12","alias_value":"MQR3DOLYJT3J","created_at":"2026-07-05T09:43:31Z"},{"alias_kind":"pith_short_16","alias_value":"MQR3DOLYJT3JLF7L","created_at":"2026-07-05T09:43:31Z"},{"alias_kind":"pith_short_8","alias_value":"MQR3DOLY","created_at":"2026-07-05T09:43:31Z"}],"graph_snapshots":[{"event_id":"sha256:1e2f3f8ea3e889eec0564654d7dcda19a0e4b2ec04b22679a400f8e6cacd8be3","target":"graph","created_at":"2026-07-05T09:43:31Z","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/2407.10273/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The inverse design of photonic integrated circuits (PICs) presents distinctive computational challenges, including their large memory requirements. Advancements in the two-photon polymerization (2PP) fabrication process introduce additional complexity, necessitating the development of more flexible optimization algorithms to enable the creation of multi-material 3D structures with unique properties. This paper presents a memory efficient reverse-mode automatic differentiation framework for finite-difference time-domain (FDTD) simulations that is able to handle complex constraints arising from ","authors_text":"Bodo Rosenhahn, Fabian Hartmann, Frederik Schubert, J\\\"orn Ostermann, Konrad Bethmann, Marco Munderloh, Reinhard Caspary, Yannik Mahlau","cross_cats":["physics.comp-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2024-07-14T17:05:27Z","title":"Quantized Inverse Design for Photonic Integrated Circuits"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2407.10273","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":"sha256:3acad601d42c81835b5f3f939834fb401e239b234ea6134b1312d77947274de1","target":"record","created_at":"2026-07-05T09:43:31Z","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":"8b4fc4eb2144b7328a42746ca1d0a2809f15c199889f8a3c22aedb2af64d716d","cross_cats_sorted":["physics.comp-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2024-07-14T17:05:27Z","title_canon_sha256":"9221e3bad0460e84f9dbaf9d21182c48f34e70b059eead9769cb3f76cf897cfc"},"schema_version":"1.0","source":{"id":"2407.10273","kind":"arxiv","version":2}},"canonical_sha256":"6423b1b9784cf69597eb36b3c5c8e12ada269b02cb32cdcf5d64c6d6e07e7e37","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"6423b1b9784cf69597eb36b3c5c8e12ada269b02cb32cdcf5d64c6d6e07e7e37","first_computed_at":"2026-07-05T09:43:31.591752Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T09:43:31.591752Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"fkVNBHTiwIAEThGKIlFn3HG0ig5v0tTDj2XaLkUaChoOkdb/F2BYBkUM06ynVmPwE423OwtkS98f0Wzl1KFcCg==","signature_status":"signed_v1","signed_at":"2026-07-05T09:43:31.592237Z","signed_message":"canonical_sha256_bytes"},"source_id":"2407.10273","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:3acad601d42c81835b5f3f939834fb401e239b234ea6134b1312d77947274de1","sha256:1e2f3f8ea3e889eec0564654d7dcda19a0e4b2ec04b22679a400f8e6cacd8be3"],"state_sha256":"1549cfe1a7cd046eb328ae25d85abfcfc69ad333f86be850bd9fde54b9b7b9dc"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+c8cmDrPQ7YBt7HrfSunOt1BWCvOZDvrSIVwWdkcLQAIWrsVaczGdvIZfo+lhTG2RETPO6wQaGT8i8M9gI/7BA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-26T18:14:04.614701Z","bundle_sha256":"cb7d4a22e845e2672212e777466dd4a3088dbdada30d9a7f77cb03fb0036574b"}}