{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:SYWQTO7GVF4ZBQH3NSRCC4P76G","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":"a33ff3a0fad90938953a8256fed2cad6b07640d528bc909efb9d67c07f7d609d","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2018-11-07T15:37:34Z","title_canon_sha256":"404cd508c405567e482c426f3fc0d5e0cfc92a6aaa5dff449310a988d3de3df0"},"schema_version":"1.0","source":{"id":"1811.02939","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1811.02939","created_at":"2026-05-17T23:47:59Z"},{"alias_kind":"arxiv_version","alias_value":"1811.02939v1","created_at":"2026-05-17T23:47:59Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1811.02939","created_at":"2026-05-17T23:47:59Z"},{"alias_kind":"pith_short_12","alias_value":"SYWQTO7GVF4Z","created_at":"2026-05-18T12:32:53Z"},{"alias_kind":"pith_short_16","alias_value":"SYWQTO7GVF4ZBQH3","created_at":"2026-05-18T12:32:53Z"},{"alias_kind":"pith_short_8","alias_value":"SYWQTO7G","created_at":"2026-05-18T12:32:53Z"}],"graph_snapshots":[{"event_id":"sha256:939b3296184c0b6800b83a742bbd2e0bc5f98299982bbe46db80849b91c106f5","target":"graph","created_at":"2026-05-17T23:47:59Z","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":"We use astigmatic transformations to characterize two-dimensional superpositions of Orbital Angular Momentum (OAM) states in laser beams. We propose two methods for doing this, both relying only on astigmatic transformations, viewed as rotations on the Poincar\\'e sphere, followed by imaging. These methods can be used as a tomographic tool for communication protocols based on optical vortices.","authors_text":"A. Z. Khoury, B. Pinheiro da Silva, D. S. Tasca, E. F. Galv\\~ao","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2018-11-07T15:37:34Z","title":"Astigmatic tomography of orbital angular momentum superpositions"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1811.02939","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":"sha256:7c2a82130e97bb715bc5863196af31d4ccb254f855ce7a6c7c32ef990f8753d1","target":"record","created_at":"2026-05-17T23:47:59Z","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":"a33ff3a0fad90938953a8256fed2cad6b07640d528bc909efb9d67c07f7d609d","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2018-11-07T15:37:34Z","title_canon_sha256":"404cd508c405567e482c426f3fc0d5e0cfc92a6aaa5dff449310a988d3de3df0"},"schema_version":"1.0","source":{"id":"1811.02939","kind":"arxiv","version":1}},"canonical_sha256":"962d09bbe6a97990c0fb6ca22171fff19ffe42bd57506664cd18e6acc857c232","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"962d09bbe6a97990c0fb6ca22171fff19ffe42bd57506664cd18e6acc857c232","first_computed_at":"2026-05-17T23:47:59.202484Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:47:59.202484Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"XHu1tFdWyrLziNvIqBdfadgYw/c8zsaeo+e4n0MrbfZXoh9rZw1fD3HWVDPo3hlzllAaknKYjpxUkmuYCGKyBw==","signature_status":"signed_v1","signed_at":"2026-05-17T23:47:59.202916Z","signed_message":"canonical_sha256_bytes"},"source_id":"1811.02939","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:7c2a82130e97bb715bc5863196af31d4ccb254f855ce7a6c7c32ef990f8753d1","sha256:939b3296184c0b6800b83a742bbd2e0bc5f98299982bbe46db80849b91c106f5"],"state_sha256":"f0f508d144bb53ddbe23d244f4e78e7ab9e7c5f64d31803e30f13ef2d49a4f13"}