{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:MMQHH7QKGD3FDE7MZPVDMXICWY","short_pith_number":"pith:MMQHH7QK","canonical_record":{"source":{"id":"1607.00828","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2016-07-04T11:39:17Z","cross_cats_sorted":[],"title_canon_sha256":"1289c76ad847322d46709bcced66f81e1471d47d2b4a1e9b93cb0723069e73c2","abstract_canon_sha256":"f695ee45faa60d7fdc28f986874dfb1937b56413b01e6fdcf972e53da4404216"},"schema_version":"1.0"},"canonical_sha256":"632073fe0a30f65193eccbea365d02b624e7600be6007248b7cd99bfb19e7363","source":{"kind":"arxiv","id":"1607.00828","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"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:MMQHH7QKGD3FDE7MZPVDMXICWY","target":"record","payload":{"canonical_record":{"source":{"id":"1607.00828","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2016-07-04T11:39:17Z","cross_cats_sorted":[],"title_canon_sha256":"1289c76ad847322d46709bcced66f81e1471d47d2b4a1e9b93cb0723069e73c2","abstract_canon_sha256":"f695ee45faa60d7fdc28f986874dfb1937b56413b01e6fdcf972e53da4404216"},"schema_version":"1.0"},"canonical_sha256":"632073fe0a30f65193eccbea365d02b624e7600be6007248b7cd99bfb19e7363","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:41:41.614419Z","signature_b64":"cnPxtKgn4WP6+bEJLk0xz8wCjZTKQUO3bV79egOCOeBCQeLaGzRWWd+9mM51qyzzaJln6Zl5xaCzPYD14/VkAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"632073fe0a30f65193eccbea365d02b624e7600be6007248b7cd99bfb19e7363","last_reissued_at":"2026-05-18T00:41:41.613932Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:41:41.613932Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1607.00828","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:41:41Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"HHrxYl7mGGICizYTiuPSTH+JAMvofb5mwKxZ47eNHZWJAzPXdZp8OjyiveSo7/EkJsLMH8uzBeI8NrSEFJ0qBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T04:26:44.039064Z"},"content_sha256":"95b173fa76d15737f534935aa508cb5a27639ad8499ce8867fa83cb3ec9f9cfc","schema_version":"1.0","event_id":"sha256:95b173fa76d15737f534935aa508cb5a27639ad8499ce8867fa83cb3ec9f9cfc"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:MMQHH7QKGD3FDE7MZPVDMXICWY","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Robust and adjustable C-shaped vortex beams","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.optics","authors_text":"G. Thirunavukkarasu, J. Yuan, M. Babiker, M. Mousley","submitted_at":"2016-07-04T11:39:17Z","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"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1607.00828","kind":"arxiv","version":1},"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":"2026-05-18T00:41:41Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"5oS79GT5PBQdTwNDg11rBND6wKYRpei8egQYjAPcPE0WF/pEKN3dvGH9LXP57IqKt3ttIXqhNcop5b1ZR734AQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T04:26:44.039431Z"},"content_sha256":"07176be716251f7d7f3f1d6e701294d2c0059235c7836a6149fc7f74c0c23738","schema_version":"1.0","event_id":"sha256:07176be716251f7d7f3f1d6e701294d2c0059235c7836a6149fc7f74c0c23738"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/MMQHH7QKGD3FDE7MZPVDMXICWY/bundle.json","state_url":"https://pith.science/pith/MMQHH7QKGD3FDE7MZPVDMXICWY/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/MMQHH7QKGD3FDE7MZPVDMXICWY/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":"2026-06-03T04:26:44Z","links":{"resolver":"https://pith.science/pith/MMQHH7QKGD3FDE7MZPVDMXICWY","bundle":"https://pith.science/pith/MMQHH7QKGD3FDE7MZPVDMXICWY/bundle.json","state":"https://pith.science/pith/MMQHH7QKGD3FDE7MZPVDMXICWY/state.json","well_known_bundle":"https://pith.science/.well-known/pith/MMQHH7QKGD3FDE7MZPVDMXICWY/bundle.json"},"state":{"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"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Ky09eiIO/N7YNL3PScJNY3N+yaBNIepefMr9kKpQiXFxi7ZTjWUm5FQSgFhPbM3LzU061nD0ugL8S09iZL3DDQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-03T04:26:44.041371Z","bundle_sha256":"48c2e62c2fefbb168405975a69c5c1a683af0a457a743c95756a5b6b29c25f6a"}}