{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2024:ZUGJVKHPGL6EBR7OPV6WLNZMLY","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":"b7e8161444d59f44fe78d9245b3fca4db20ca670040095f309c2b08e39361536","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"eess.SP","submitted_at":"2024-08-29T15:16:47Z","title_canon_sha256":"ef76f5248431054ac95602fc055511bf5ee307dadb3d031702c1c86bcedee364"},"schema_version":"1.0","source":{"id":"2408.16606","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2408.16606","created_at":"2026-07-05T09:56:36Z"},{"alias_kind":"arxiv_version","alias_value":"2408.16606v3","created_at":"2026-07-05T09:56:36Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2408.16606","created_at":"2026-07-05T09:56:36Z"},{"alias_kind":"pith_short_12","alias_value":"ZUGJVKHPGL6E","created_at":"2026-07-05T09:56:36Z"},{"alias_kind":"pith_short_16","alias_value":"ZUGJVKHPGL6EBR7O","created_at":"2026-07-05T09:56:36Z"},{"alias_kind":"pith_short_8","alias_value":"ZUGJVKHP","created_at":"2026-07-05T09:56:36Z"}],"graph_snapshots":[{"event_id":"sha256:af049db8fa8a9534cea2e8dd60e9f3228fbb2cdf35e30dd7d512195fedff871a","target":"graph","created_at":"2026-07-05T09:56:36Z","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/2408.16606/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"A novel technology based on stacked intelligent metasurfaces (SIM) has recently emerged. This platform involves cascading multiple metasurfaces, each acting as a digitally programmable physical layer within a diffractive neural network. SIM enable the implementation of signal-processing transformations directly in the electromagnetic wave domain, eliminating the need for expensive, high-precision, and power-intensive digital platforms. However, existing studies employing SIM in wireless communication applications rely solely on nearly passive structures that control only the phase of the meta-","authors_text":"Donatella Darsena, Francesco Verde, Ivan Iudice, Vincenzo Galdi","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"eess.SP","submitted_at":"2024-08-29T15:16:47Z","title":"Design of stacked intelligent metasurfaces with reconfigurable amplitude and phase for multiuser downlink beamforming"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2408.16606","kind":"arxiv","version":3},"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":"sha256:2c7dedf52c3a69d153f6505dbe5d030721de0663f74002875edede8b7f0ac659","target":"record","created_at":"2026-07-05T09:56:36Z","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":"b7e8161444d59f44fe78d9245b3fca4db20ca670040095f309c2b08e39361536","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"eess.SP","submitted_at":"2024-08-29T15:16:47Z","title_canon_sha256":"ef76f5248431054ac95602fc055511bf5ee307dadb3d031702c1c86bcedee364"},"schema_version":"1.0","source":{"id":"2408.16606","kind":"arxiv","version":3}},"canonical_sha256":"cd0c9aa8ef32fc40c7ee7d7d65b72c5e33f33c23ed53eb87a81dfbd79f1dc35d","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"cd0c9aa8ef32fc40c7ee7d7d65b72c5e33f33c23ed53eb87a81dfbd79f1dc35d","first_computed_at":"2026-07-05T09:56:36.926762Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T09:56:36.926762Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"KFec4THDAdHxlhtyqMK3t8tx2gverR9EKiHOUUho5U5/+6MKO6D5MoGt4fBKqcBm0RvCAcuXbKdX6v0LBVmBAQ==","signature_status":"signed_v1","signed_at":"2026-07-05T09:56:36.927248Z","signed_message":"canonical_sha256_bytes"},"source_id":"2408.16606","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:2c7dedf52c3a69d153f6505dbe5d030721de0663f74002875edede8b7f0ac659","sha256:af049db8fa8a9534cea2e8dd60e9f3228fbb2cdf35e30dd7d512195fedff871a"],"state_sha256":"018cba0b285dc26a5221ae0a2da4887fc4312b99a3aee1907f654d5cd400f74b"}