{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2012:SOWIWHN7BFPVVW63ASIMX7JJKP","short_pith_number":"pith:SOWIWHN7","canonical_record":{"source":{"id":"1209.4534","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2012-09-20T14:06:03Z","cross_cats_sorted":[],"title_canon_sha256":"a8ee8f752a56b54146b4560c1aada0f833f3edaf7f2df8c081b6240834a1b1c9","abstract_canon_sha256":"88655e7e998b0064006790da129a2b35aa72b68e17bbcc77367004533b3b854a"},"schema_version":"1.0"},"canonical_sha256":"93ac8b1dbf095f5adbdb0490cbfd2953dd9d1f03dbf0a6eeda42cf500ae6a162","source":{"kind":"arxiv","id":"1209.4534","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1209.4534","created_at":"2026-05-18T03:34:16Z"},{"alias_kind":"arxiv_version","alias_value":"1209.4534v2","created_at":"2026-05-18T03:34:16Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1209.4534","created_at":"2026-05-18T03:34:16Z"},{"alias_kind":"pith_short_12","alias_value":"SOWIWHN7BFPV","created_at":"2026-05-18T12:27:20Z"},{"alias_kind":"pith_short_16","alias_value":"SOWIWHN7BFPVVW63","created_at":"2026-05-18T12:27:20Z"},{"alias_kind":"pith_short_8","alias_value":"SOWIWHN7","created_at":"2026-05-18T12:27:20Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2012:SOWIWHN7BFPVVW63ASIMX7JJKP","target":"record","payload":{"canonical_record":{"source":{"id":"1209.4534","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2012-09-20T14:06:03Z","cross_cats_sorted":[],"title_canon_sha256":"a8ee8f752a56b54146b4560c1aada0f833f3edaf7f2df8c081b6240834a1b1c9","abstract_canon_sha256":"88655e7e998b0064006790da129a2b35aa72b68e17bbcc77367004533b3b854a"},"schema_version":"1.0"},"canonical_sha256":"93ac8b1dbf095f5adbdb0490cbfd2953dd9d1f03dbf0a6eeda42cf500ae6a162","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:34:16.051771Z","signature_b64":"1g2tt1G20d5RvgtQgzAg3dcZ5+d5g7ng73pSlosWl4I+lTihdHLwdX6YHHyYjtqvQVCPlOlPBdp5/OWISI9pBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"93ac8b1dbf095f5adbdb0490cbfd2953dd9d1f03dbf0a6eeda42cf500ae6a162","last_reissued_at":"2026-05-18T03:34:16.051064Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:34:16.051064Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1209.4534","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":"2026-05-18T03:34:16Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+TyDvrk43s1yySIk6xcIvXaUw+Wf7UG/Cwp6EA0EwjDyPEWwZ0dQHVAG9g15rsu5rPLoFTGkLDGFnmuejZQ9Aw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T21:17:18.252429Z"},"content_sha256":"c50fc84c675f6af61375c60d060b0af0fea67f415124a13f125a4305183c82b1","schema_version":"1.0","event_id":"sha256:c50fc84c675f6af61375c60d060b0af0fea67f415124a13f125a4305183c82b1"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2012:SOWIWHN7BFPVVW63ASIMX7JJKP","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Liquid crystal spatial-mode converters for the orbital angular momentum of light","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.optics","authors_text":"Bruno Piccirillo, Enrico Santamato, Lorenzo Marrucci, Sergei Slussarenko, Vladimir Chigrinov","submitted_at":"2012-09-20T14:06:03Z","abstract_excerpt":"We present a tunable liquid crystal device that converts pure orbital angular momentum eigenmodes of a light beam into equal-weight superpositions of opposite-handed eigenmodes and vice versa. For specific input states, the device may thus simulate the behavior of a {\\pi}/2 phase retarder in a given two-dimensional orbital angular momentum subspace, analogous to a quarter-wave plate for optical polarization. A variant of the same device generates the same final modes starting from a Gaussian input."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1209.4534","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":""},"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":"2026-05-18T03:34:16Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"MBGJcsW8egu9S2icop3BKBW2Ac+L2ZaimPNlhbJi2ql79q+hegphJ7VGWek4KapnJNGwzWrxaIQWMssjisAtDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T21:17:18.253098Z"},"content_sha256":"f7e0ddb1469350553e5f52b816dd58e87d86d17db439240756bdb3a8dfc2cd56","schema_version":"1.0","event_id":"sha256:f7e0ddb1469350553e5f52b816dd58e87d86d17db439240756bdb3a8dfc2cd56"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/SOWIWHN7BFPVVW63ASIMX7JJKP/bundle.json","state_url":"https://pith.science/pith/SOWIWHN7BFPVVW63ASIMX7JJKP/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/SOWIWHN7BFPVVW63ASIMX7JJKP/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":"2026-05-27T21:17:18Z","links":{"resolver":"https://pith.science/pith/SOWIWHN7BFPVVW63ASIMX7JJKP","bundle":"https://pith.science/pith/SOWIWHN7BFPVVW63ASIMX7JJKP/bundle.json","state":"https://pith.science/pith/SOWIWHN7BFPVVW63ASIMX7JJKP/state.json","well_known_bundle":"https://pith.science/.well-known/pith/SOWIWHN7BFPVVW63ASIMX7JJKP/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:SOWIWHN7BFPVVW63ASIMX7JJKP","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":"88655e7e998b0064006790da129a2b35aa72b68e17bbcc77367004533b3b854a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2012-09-20T14:06:03Z","title_canon_sha256":"a8ee8f752a56b54146b4560c1aada0f833f3edaf7f2df8c081b6240834a1b1c9"},"schema_version":"1.0","source":{"id":"1209.4534","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1209.4534","created_at":"2026-05-18T03:34:16Z"},{"alias_kind":"arxiv_version","alias_value":"1209.4534v2","created_at":"2026-05-18T03:34:16Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1209.4534","created_at":"2026-05-18T03:34:16Z"},{"alias_kind":"pith_short_12","alias_value":"SOWIWHN7BFPV","created_at":"2026-05-18T12:27:20Z"},{"alias_kind":"pith_short_16","alias_value":"SOWIWHN7BFPVVW63","created_at":"2026-05-18T12:27:20Z"},{"alias_kind":"pith_short_8","alias_value":"SOWIWHN7","created_at":"2026-05-18T12:27:20Z"}],"graph_snapshots":[{"event_id":"sha256:f7e0ddb1469350553e5f52b816dd58e87d86d17db439240756bdb3a8dfc2cd56","target":"graph","created_at":"2026-05-18T03:34:16Z","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 present a tunable liquid crystal device that converts pure orbital angular momentum eigenmodes of a light beam into equal-weight superpositions of opposite-handed eigenmodes and vice versa. For specific input states, the device may thus simulate the behavior of a {\\pi}/2 phase retarder in a given two-dimensional orbital angular momentum subspace, analogous to a quarter-wave plate for optical polarization. A variant of the same device generates the same final modes starting from a Gaussian input.","authors_text":"Bruno Piccirillo, Enrico Santamato, Lorenzo Marrucci, Sergei Slussarenko, Vladimir Chigrinov","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2012-09-20T14:06:03Z","title":"Liquid crystal spatial-mode converters for the orbital angular momentum of light"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1209.4534","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:c50fc84c675f6af61375c60d060b0af0fea67f415124a13f125a4305183c82b1","target":"record","created_at":"2026-05-18T03:34:16Z","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":"88655e7e998b0064006790da129a2b35aa72b68e17bbcc77367004533b3b854a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2012-09-20T14:06:03Z","title_canon_sha256":"a8ee8f752a56b54146b4560c1aada0f833f3edaf7f2df8c081b6240834a1b1c9"},"schema_version":"1.0","source":{"id":"1209.4534","kind":"arxiv","version":2}},"canonical_sha256":"93ac8b1dbf095f5adbdb0490cbfd2953dd9d1f03dbf0a6eeda42cf500ae6a162","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"93ac8b1dbf095f5adbdb0490cbfd2953dd9d1f03dbf0a6eeda42cf500ae6a162","first_computed_at":"2026-05-18T03:34:16.051064Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:34:16.051064Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"1g2tt1G20d5RvgtQgzAg3dcZ5+d5g7ng73pSlosWl4I+lTihdHLwdX6YHHyYjtqvQVCPlOlPBdp5/OWISI9pBg==","signature_status":"signed_v1","signed_at":"2026-05-18T03:34:16.051771Z","signed_message":"canonical_sha256_bytes"},"source_id":"1209.4534","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c50fc84c675f6af61375c60d060b0af0fea67f415124a13f125a4305183c82b1","sha256:f7e0ddb1469350553e5f52b816dd58e87d86d17db439240756bdb3a8dfc2cd56"],"state_sha256":"07d88b39fd49372178bc054e34eb9c677e98888f4911eac9787fe658d7c2fe2c"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Z/AGYDCX0F/JDyqkX44VCe8akz5xcfX5MQ8D3R1ZEmgOMygD8RP7gjV3JqEN4TmvpGtUbTXxIo57vfk0X4zzAQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-27T21:17:18.256124Z","bundle_sha256":"75e25f5db2888b809577c8e5cd6bd5811ce43095ed1c73ae7d0ca99088970e9c"}}