{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2014:SOIBGBK7CP5RGUY7ZCLPOUZ7UK","short_pith_number":"pith:SOIBGBK7","canonical_record":{"source":{"id":"1406.6212","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2014-06-24T12:19:03Z","cross_cats_sorted":["physics.optics"],"title_canon_sha256":"48123effb45de2a45d8d8726d52f7e6dbc33cfa9ad42c6d7105e845102cb5f3e","abstract_canon_sha256":"16316bb1f8ff69ae394eae88e4af40a6ba88f969bc42ac8d58badcd325878fda"},"schema_version":"1.0"},"canonical_sha256":"939013055f13fb13531fc896f7533fa2906977500648cac4685bb5cd4b8febbc","source":{"kind":"arxiv","id":"1406.6212","version":3},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1406.6212","created_at":"2026-05-18T01:04:24Z"},{"alias_kind":"arxiv_version","alias_value":"1406.6212v3","created_at":"2026-05-18T01:04:24Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1406.6212","created_at":"2026-05-18T01:04:24Z"},{"alias_kind":"pith_short_12","alias_value":"SOIBGBK7CP5R","created_at":"2026-05-18T12:28:49Z"},{"alias_kind":"pith_short_16","alias_value":"SOIBGBK7CP5RGUY7","created_at":"2026-05-18T12:28:49Z"},{"alias_kind":"pith_short_8","alias_value":"SOIBGBK7","created_at":"2026-05-18T12:28:49Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2014:SOIBGBK7CP5RGUY7ZCLPOUZ7UK","target":"record","payload":{"canonical_record":{"source":{"id":"1406.6212","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2014-06-24T12:19:03Z","cross_cats_sorted":["physics.optics"],"title_canon_sha256":"48123effb45de2a45d8d8726d52f7e6dbc33cfa9ad42c6d7105e845102cb5f3e","abstract_canon_sha256":"16316bb1f8ff69ae394eae88e4af40a6ba88f969bc42ac8d58badcd325878fda"},"schema_version":"1.0"},"canonical_sha256":"939013055f13fb13531fc896f7533fa2906977500648cac4685bb5cd4b8febbc","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:04:24.794786Z","signature_b64":"XjxPiR+l+xhiSbyLutP7pPUs+sy1UL55dysqpdZ2UciBdpN9YZLSiTcqxcR9IIoPfUOPfO85UTrunn8loiq4Aw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"939013055f13fb13531fc896f7533fa2906977500648cac4685bb5cd4b8febbc","last_reissued_at":"2026-05-18T01:04:24.793858Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:04:24.793858Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1406.6212","source_version":3,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:04:24Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"jT54yD/o3/LdoFirn9rmyYDoU5EjbdGOYDXwLlyzcdsXZ+A/WYsGnucSF5bTRtGKeRmFetcr08rEpLksuWs7AA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-20T15:40:55.629829Z"},"content_sha256":"c1ed09222fcf409c94ced97a0896b202c01deef6d1bc8d4b9f3a9871a0ce83af","schema_version":"1.0","event_id":"sha256:c1ed09222fcf409c94ced97a0896b202c01deef6d1bc8d4b9f3a9871a0ce83af"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2014:SOIBGBK7CP5RGUY7ZCLPOUZ7UK","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Entanglement propagation of a quantum optical vortex state","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.optics"],"primary_cat":"quant-ph","authors_text":"Abir Bandyopadhyay, Anindya Banerji, Dhruba Banerjee, Ravindra Pratap Singh","submitted_at":"2014-06-24T12:19:03Z","abstract_excerpt":"We study the entanglement evolution of a quantum optical vortex state propagating through coupled lossless waveguides. We consider states generated by coupling two squeezed modes using a sequence of beam splitters and also by subtracting photons from the signal in spontaneous parametric down conversion. We reconstruct the Wigner function at a later time to study the correlation and quantify the entanglement after propagation using \\emph{logarithmic negativity}."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1406.6212","kind":"arxiv","version":3},"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":"2026-05-18T01:04:24Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"FzglbuWqPl0n2W0JXZasxMWg5jqASPQCfiObN3s4uaAWJ7AyK3zvNMtiGZp6PSq2c+QccWQ+7IL+EKLbxdvlDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-20T15:40:55.630172Z"},"content_sha256":"88ca16c13650cbaa8cd266da645c0f488243e7e20e2db8b7377c1fce2a5eff02","schema_version":"1.0","event_id":"sha256:88ca16c13650cbaa8cd266da645c0f488243e7e20e2db8b7377c1fce2a5eff02"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/SOIBGBK7CP5RGUY7ZCLPOUZ7UK/bundle.json","state_url":"https://pith.science/pith/SOIBGBK7CP5RGUY7ZCLPOUZ7UK/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/SOIBGBK7CP5RGUY7ZCLPOUZ7UK/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":"2026-06-20T15:40:55Z","links":{"resolver":"https://pith.science/pith/SOIBGBK7CP5RGUY7ZCLPOUZ7UK","bundle":"https://pith.science/pith/SOIBGBK7CP5RGUY7ZCLPOUZ7UK/bundle.json","state":"https://pith.science/pith/SOIBGBK7CP5RGUY7ZCLPOUZ7UK/state.json","well_known_bundle":"https://pith.science/.well-known/pith/SOIBGBK7CP5RGUY7ZCLPOUZ7UK/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:SOIBGBK7CP5RGUY7ZCLPOUZ7UK","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":"16316bb1f8ff69ae394eae88e4af40a6ba88f969bc42ac8d58badcd325878fda","cross_cats_sorted":["physics.optics"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2014-06-24T12:19:03Z","title_canon_sha256":"48123effb45de2a45d8d8726d52f7e6dbc33cfa9ad42c6d7105e845102cb5f3e"},"schema_version":"1.0","source":{"id":"1406.6212","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1406.6212","created_at":"2026-05-18T01:04:24Z"},{"alias_kind":"arxiv_version","alias_value":"1406.6212v3","created_at":"2026-05-18T01:04:24Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1406.6212","created_at":"2026-05-18T01:04:24Z"},{"alias_kind":"pith_short_12","alias_value":"SOIBGBK7CP5R","created_at":"2026-05-18T12:28:49Z"},{"alias_kind":"pith_short_16","alias_value":"SOIBGBK7CP5RGUY7","created_at":"2026-05-18T12:28:49Z"},{"alias_kind":"pith_short_8","alias_value":"SOIBGBK7","created_at":"2026-05-18T12:28:49Z"}],"graph_snapshots":[{"event_id":"sha256:88ca16c13650cbaa8cd266da645c0f488243e7e20e2db8b7377c1fce2a5eff02","target":"graph","created_at":"2026-05-18T01:04:24Z","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 study the entanglement evolution of a quantum optical vortex state propagating through coupled lossless waveguides. We consider states generated by coupling two squeezed modes using a sequence of beam splitters and also by subtracting photons from the signal in spontaneous parametric down conversion. We reconstruct the Wigner function at a later time to study the correlation and quantify the entanglement after propagation using \\emph{logarithmic negativity}.","authors_text":"Abir Bandyopadhyay, Anindya Banerji, Dhruba Banerjee, Ravindra Pratap Singh","cross_cats":["physics.optics"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2014-06-24T12:19:03Z","title":"Entanglement propagation of a quantum optical vortex state"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1406.6212","kind":"arxiv","version":3},"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:c1ed09222fcf409c94ced97a0896b202c01deef6d1bc8d4b9f3a9871a0ce83af","target":"record","created_at":"2026-05-18T01:04:24Z","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":"16316bb1f8ff69ae394eae88e4af40a6ba88f969bc42ac8d58badcd325878fda","cross_cats_sorted":["physics.optics"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2014-06-24T12:19:03Z","title_canon_sha256":"48123effb45de2a45d8d8726d52f7e6dbc33cfa9ad42c6d7105e845102cb5f3e"},"schema_version":"1.0","source":{"id":"1406.6212","kind":"arxiv","version":3}},"canonical_sha256":"939013055f13fb13531fc896f7533fa2906977500648cac4685bb5cd4b8febbc","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"939013055f13fb13531fc896f7533fa2906977500648cac4685bb5cd4b8febbc","first_computed_at":"2026-05-18T01:04:24.793858Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:04:24.793858Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"XjxPiR+l+xhiSbyLutP7pPUs+sy1UL55dysqpdZ2UciBdpN9YZLSiTcqxcR9IIoPfUOPfO85UTrunn8loiq4Aw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:04:24.794786Z","signed_message":"canonical_sha256_bytes"},"source_id":"1406.6212","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c1ed09222fcf409c94ced97a0896b202c01deef6d1bc8d4b9f3a9871a0ce83af","sha256:88ca16c13650cbaa8cd266da645c0f488243e7e20e2db8b7377c1fce2a5eff02"],"state_sha256":"3a0a5b9d56ae1ad533a870983168e0efee4fe18703461c478cf0b4fcce3b3deb"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"YFG+14XdQj/tVB519x9TT/9vzes3FWGwtfy34UhjyvVKsQaN0mUeNLZCgPQzkMkHpE0NquL2iwRq8fIn/4d0BA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-20T15:40:55.632072Z","bundle_sha256":"3be8dec728eeaeac47a4b8d96f8f11f297819d4ef60853a1ec4a1e94b2246466"}}