{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:MMQHH7QKGD3FDE7MZPVDMXICWY","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":"f695ee45faa60d7fdc28f986874dfb1937b56413b01e6fdcf972e53da4404216","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2016-07-04T11:39:17Z","title_canon_sha256":"1289c76ad847322d46709bcced66f81e1471d47d2b4a1e9b93cb0723069e73c2"},"schema_version":"1.0","source":{"id":"1607.00828","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1607.00828","created_at":"2026-05-18T00:41:41Z"},{"alias_kind":"arxiv_version","alias_value":"1607.00828v1","created_at":"2026-05-18T00:41:41Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1607.00828","created_at":"2026-05-18T00:41:41Z"},{"alias_kind":"pith_short_12","alias_value":"MMQHH7QKGD3F","created_at":"2026-05-18T12:30:32Z"},{"alias_kind":"pith_short_16","alias_value":"MMQHH7QKGD3FDE7M","created_at":"2026-05-18T12:30:32Z"},{"alias_kind":"pith_short_8","alias_value":"MMQHH7QK","created_at":"2026-05-18T12:30:32Z"}],"graph_snapshots":[{"event_id":"sha256:07176be716251f7d7f3f1d6e701294d2c0059235c7836a6149fc7f74c0c23738","target":"graph","created_at":"2026-05-18T00:41:41Z","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":"Wavefront engineering is an important quantum technology. Here, we demonstrate the design and production of a robust C-shaped and orbital angular momentum (OAM) carrying beam in which the doughnut shaped structure contains an adjustable gap. We find that the presence of the vortex line in the core of the beam is crucial for the robustness of the C-shape against beam propagation. The topological charge of the vortex core controls mainly the size of the C, while its opening angle is controlled by the presence of vortex-anti-vortex loops. We demonstrate the generation and characterisation of C-sh","authors_text":"G. Thirunavukkarasu, J. Yuan, M. Babiker, M. Mousley","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2016-07-04T11:39:17Z","title":"Robust and adjustable C-shaped vortex beams"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1607.00828","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":"sha256:95b173fa76d15737f534935aa508cb5a27639ad8499ce8867fa83cb3ec9f9cfc","target":"record","created_at":"2026-05-18T00:41:41Z","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":"f695ee45faa60d7fdc28f986874dfb1937b56413b01e6fdcf972e53da4404216","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2016-07-04T11:39:17Z","title_canon_sha256":"1289c76ad847322d46709bcced66f81e1471d47d2b4a1e9b93cb0723069e73c2"},"schema_version":"1.0","source":{"id":"1607.00828","kind":"arxiv","version":1}},"canonical_sha256":"632073fe0a30f65193eccbea365d02b624e7600be6007248b7cd99bfb19e7363","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"632073fe0a30f65193eccbea365d02b624e7600be6007248b7cd99bfb19e7363","first_computed_at":"2026-05-18T00:41:41.613932Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:41:41.613932Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"cnPxtKgn4WP6+bEJLk0xz8wCjZTKQUO3bV79egOCOeBCQeLaGzRWWd+9mM51qyzzaJln6Zl5xaCzPYD14/VkAw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:41:41.614419Z","signed_message":"canonical_sha256_bytes"},"source_id":"1607.00828","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:95b173fa76d15737f534935aa508cb5a27639ad8499ce8867fa83cb3ec9f9cfc","sha256:07176be716251f7d7f3f1d6e701294d2c0059235c7836a6149fc7f74c0c23738"],"state_sha256":"92c20dbe05f747d00068aecc63d14d29a450c91788568b4917a34216cfe1de75"}