{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:43WR4TV4BBL3WAAIALS2T2LYTZ","short_pith_number":"pith:43WR4TV4","canonical_record":{"source":{"id":"1605.01764","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2016-05-05T21:37:57Z","cross_cats_sorted":["physics.optics"],"title_canon_sha256":"1fb365bb087696de1ebe995ecc0c8b2f9fa45834740ac0a0e2fd4f1fcb4ffacf","abstract_canon_sha256":"dfa576bbd5bfdafb3a0b9e41553e6ff9b6c9acbbf19d6e2951310ff246896bb8"},"schema_version":"1.0"},"canonical_sha256":"e6ed1e4ebc0857bb000802e5a9e9789e7e7d8be64a59dd1178a2fd475a5f5849","source":{"kind":"arxiv","id":"1605.01764","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1605.01764","created_at":"2026-05-18T01:15:31Z"},{"alias_kind":"arxiv_version","alias_value":"1605.01764v1","created_at":"2026-05-18T01:15:31Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1605.01764","created_at":"2026-05-18T01:15:31Z"},{"alias_kind":"pith_short_12","alias_value":"43WR4TV4BBL3","created_at":"2026-05-18T12:29:58Z"},{"alias_kind":"pith_short_16","alias_value":"43WR4TV4BBL3WAAI","created_at":"2026-05-18T12:29:58Z"},{"alias_kind":"pith_short_8","alias_value":"43WR4TV4","created_at":"2026-05-18T12:29:58Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:43WR4TV4BBL3WAAIALS2T2LYTZ","target":"record","payload":{"canonical_record":{"source":{"id":"1605.01764","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2016-05-05T21:37:57Z","cross_cats_sorted":["physics.optics"],"title_canon_sha256":"1fb365bb087696de1ebe995ecc0c8b2f9fa45834740ac0a0e2fd4f1fcb4ffacf","abstract_canon_sha256":"dfa576bbd5bfdafb3a0b9e41553e6ff9b6c9acbbf19d6e2951310ff246896bb8"},"schema_version":"1.0"},"canonical_sha256":"e6ed1e4ebc0857bb000802e5a9e9789e7e7d8be64a59dd1178a2fd475a5f5849","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:15:31.560829Z","signature_b64":"DGpnz5vEUguFeastHwoE8uJbjlBHOtPVWO/p50PFPcCUSjptp/5As13yiIlW02h7/uYBsCVRkoaOBLhohjsvDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e6ed1e4ebc0857bb000802e5a9e9789e7e7d8be64a59dd1178a2fd475a5f5849","last_reissued_at":"2026-05-18T01:15:31.560230Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:15:31.560230Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1605.01764","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":"2026-05-18T01:15:31Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"kqExwq413MHZgsznmpIKTLmmC5YJIXB4vngq+LSRcbecK0g+8sTF+wcqeSPkCyFcHnyUbOQEEi/bJ5oZ099DBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-05T05:37:02.468732Z"},"content_sha256":"9b67d482c99b4bc6cc9af272c6f38d986a861ad2f8a5584cc57544b37e994fe5","schema_version":"1.0","event_id":"sha256:9b67d482c99b4bc6cc9af272c6f38d986a861ad2f8a5584cc57544b37e994fe5"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:43WR4TV4BBL3WAAIALS2T2LYTZ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Narrow band amplification of light carrying orbital angular momentum","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.optics"],"primary_cat":"quant-ph","authors_text":"D. Felinto, G. C. Borba, J. W. R. Tabosa, L. Pruvost, S. Barreiro","submitted_at":"2016-05-05T21:37:57Z","abstract_excerpt":"We report on the amplification of an optical vortex beam carrying orbital angular momentum via induced narrow Raman gain in an ensemble of cold cesium atoms. A 20\\% single-pass Raman gain of a weak vortex signal field is observed with a spectral width of order of 1 MHz, much smaller than the natural width, demonstrating that the amplification process preserves the phase structure of the vortex beam. The gain is observed in the degenerated two-level system associated with the hyperfine transition $6S_{1/2}(F=3)\\leftrightarrow 6P_{3/2}(F^{\\prime}=2)$ of cesium. Our experimental observations are "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1605.01764","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":"2026-05-18T01:15:31Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"8nrxRxHievEcLAdRCO9gT/FL99RukIjwr+VwBHnGbUqDXd2AdK8wBtwwXAbSFeNozync1HlTvl+x/s62ZH+lBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-05T05:37:02.469413Z"},"content_sha256":"74d0726346fb93b7931e48a3dd54c5c4ce05faf0108bc343348882758ad0ba0c","schema_version":"1.0","event_id":"sha256:74d0726346fb93b7931e48a3dd54c5c4ce05faf0108bc343348882758ad0ba0c"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/43WR4TV4BBL3WAAIALS2T2LYTZ/bundle.json","state_url":"https://pith.science/pith/43WR4TV4BBL3WAAIALS2T2LYTZ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/43WR4TV4BBL3WAAIALS2T2LYTZ/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":"2026-06-05T05:37:02Z","links":{"resolver":"https://pith.science/pith/43WR4TV4BBL3WAAIALS2T2LYTZ","bundle":"https://pith.science/pith/43WR4TV4BBL3WAAIALS2T2LYTZ/bundle.json","state":"https://pith.science/pith/43WR4TV4BBL3WAAIALS2T2LYTZ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/43WR4TV4BBL3WAAIALS2T2LYTZ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:43WR4TV4BBL3WAAIALS2T2LYTZ","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":"dfa576bbd5bfdafb3a0b9e41553e6ff9b6c9acbbf19d6e2951310ff246896bb8","cross_cats_sorted":["physics.optics"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2016-05-05T21:37:57Z","title_canon_sha256":"1fb365bb087696de1ebe995ecc0c8b2f9fa45834740ac0a0e2fd4f1fcb4ffacf"},"schema_version":"1.0","source":{"id":"1605.01764","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1605.01764","created_at":"2026-05-18T01:15:31Z"},{"alias_kind":"arxiv_version","alias_value":"1605.01764v1","created_at":"2026-05-18T01:15:31Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1605.01764","created_at":"2026-05-18T01:15:31Z"},{"alias_kind":"pith_short_12","alias_value":"43WR4TV4BBL3","created_at":"2026-05-18T12:29:58Z"},{"alias_kind":"pith_short_16","alias_value":"43WR4TV4BBL3WAAI","created_at":"2026-05-18T12:29:58Z"},{"alias_kind":"pith_short_8","alias_value":"43WR4TV4","created_at":"2026-05-18T12:29:58Z"}],"graph_snapshots":[{"event_id":"sha256:74d0726346fb93b7931e48a3dd54c5c4ce05faf0108bc343348882758ad0ba0c","target":"graph","created_at":"2026-05-18T01:15:31Z","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 report on the amplification of an optical vortex beam carrying orbital angular momentum via induced narrow Raman gain in an ensemble of cold cesium atoms. A 20\\% single-pass Raman gain of a weak vortex signal field is observed with a spectral width of order of 1 MHz, much smaller than the natural width, demonstrating that the amplification process preserves the phase structure of the vortex beam. The gain is observed in the degenerated two-level system associated with the hyperfine transition $6S_{1/2}(F=3)\\leftrightarrow 6P_{3/2}(F^{\\prime}=2)$ of cesium. Our experimental observations are ","authors_text":"D. Felinto, G. C. Borba, J. W. R. Tabosa, L. Pruvost, S. Barreiro","cross_cats":["physics.optics"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2016-05-05T21:37:57Z","title":"Narrow band amplification of light carrying orbital angular momentum"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1605.01764","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":"sha256:9b67d482c99b4bc6cc9af272c6f38d986a861ad2f8a5584cc57544b37e994fe5","target":"record","created_at":"2026-05-18T01:15:31Z","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":"dfa576bbd5bfdafb3a0b9e41553e6ff9b6c9acbbf19d6e2951310ff246896bb8","cross_cats_sorted":["physics.optics"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2016-05-05T21:37:57Z","title_canon_sha256":"1fb365bb087696de1ebe995ecc0c8b2f9fa45834740ac0a0e2fd4f1fcb4ffacf"},"schema_version":"1.0","source":{"id":"1605.01764","kind":"arxiv","version":1}},"canonical_sha256":"e6ed1e4ebc0857bb000802e5a9e9789e7e7d8be64a59dd1178a2fd475a5f5849","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"e6ed1e4ebc0857bb000802e5a9e9789e7e7d8be64a59dd1178a2fd475a5f5849","first_computed_at":"2026-05-18T01:15:31.560230Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:15:31.560230Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"DGpnz5vEUguFeastHwoE8uJbjlBHOtPVWO/p50PFPcCUSjptp/5As13yiIlW02h7/uYBsCVRkoaOBLhohjsvDw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:15:31.560829Z","signed_message":"canonical_sha256_bytes"},"source_id":"1605.01764","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:9b67d482c99b4bc6cc9af272c6f38d986a861ad2f8a5584cc57544b37e994fe5","sha256:74d0726346fb93b7931e48a3dd54c5c4ce05faf0108bc343348882758ad0ba0c"],"state_sha256":"93678318c6df59a84352943d3486a67d62d2a04386f30a47048b86731e053418"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"RFTApop5y/CIsNeku6Xu0eyC/RI5L7VAki5SJIYnpkge80GiBNx7E2Ki7/27214RxWCMifk2MEX9kdt4G++WDA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-05T05:37:02.472868Z","bundle_sha256":"6f89af7af28509c63371d3ef7abd713289fcc3d4d58243ef53894ad94dcfdebc"}}