{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2010:EEVSVDE7MR5HKWPYKPLYGIT4VH","short_pith_number":"pith:EEVSVDE7","canonical_record":{"source":{"id":"1009.2869","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2010-09-15T09:14:00Z","cross_cats_sorted":["physics.optics"],"title_canon_sha256":"ad2c54946ab09b89a937610f94a555fb5c095c2bb4691536660c47847a5af38e","abstract_canon_sha256":"06c4c9e75430ec37d7d8f96ffad5ccb8b4ef2c2703617ca51e2d4f20b07dec46"},"schema_version":"1.0"},"canonical_sha256":"212b2a8c9f647a7559f853d783227ca9eca863af7f6e1ae1745b4c9354a1829b","source":{"kind":"arxiv","id":"1009.2869","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1009.2869","created_at":"2026-05-18T04:40:55Z"},{"alias_kind":"arxiv_version","alias_value":"1009.2869v1","created_at":"2026-05-18T04:40:55Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1009.2869","created_at":"2026-05-18T04:40:55Z"},{"alias_kind":"pith_short_12","alias_value":"EEVSVDE7MR5H","created_at":"2026-05-18T12:26:06Z"},{"alias_kind":"pith_short_16","alias_value":"EEVSVDE7MR5HKWPY","created_at":"2026-05-18T12:26:06Z"},{"alias_kind":"pith_short_8","alias_value":"EEVSVDE7","created_at":"2026-05-18T12:26:06Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2010:EEVSVDE7MR5HKWPYKPLYGIT4VH","target":"record","payload":{"canonical_record":{"source":{"id":"1009.2869","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2010-09-15T09:14:00Z","cross_cats_sorted":["physics.optics"],"title_canon_sha256":"ad2c54946ab09b89a937610f94a555fb5c095c2bb4691536660c47847a5af38e","abstract_canon_sha256":"06c4c9e75430ec37d7d8f96ffad5ccb8b4ef2c2703617ca51e2d4f20b07dec46"},"schema_version":"1.0"},"canonical_sha256":"212b2a8c9f647a7559f853d783227ca9eca863af7f6e1ae1745b4c9354a1829b","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:40:55.378907Z","signature_b64":"jRIW8xTOnHWDgxRsCfxBxVWQyL/zEMOGwiLNJV3G+ETDoFngJn4vOFcMJQ+vlWJ69IFR6pqaXNE3zdpVwFb4Bg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"212b2a8c9f647a7559f853d783227ca9eca863af7f6e1ae1745b4c9354a1829b","last_reissued_at":"2026-05-18T04:40:55.378167Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:40:55.378167Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1009.2869","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":"2026-05-18T04:40:55Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ztXz+9/i0RwhKGBmv9fT+H2eySjB0Uadh2sVY5KmN0BsNAxo+VN/nBGRkHy7BWFMngE3XfRkxv4U6ltkI2SbCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T03:43:10.059634Z"},"content_sha256":"8f037a8e0949565499548527bd35a401f90c594b9f365f1527164ecae0ddd638","schema_version":"1.0","event_id":"sha256:8f037a8e0949565499548527bd35a401f90c594b9f365f1527164ecae0ddd638"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2010:EEVSVDE7MR5HKWPYKPLYGIT4VH","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Experimental optimal cloning of four-dimensional quantum states of photons","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.optics"],"primary_cat":"quant-ph","authors_text":"Daniele Giovannini, Eleonora Nagali, Enrico Santamato, Fabio Sciarrino, Lorenzo Marrucci, Sergei Slussarenko","submitted_at":"2010-09-15T09:14:00Z","abstract_excerpt":"Optimal quantum cloning is the process of making one or more copies of an arbitrary unknown input quantum state with the highest possible fidelity. All reported demonstrations of quantum cloning have so far been limited to copying two-dimensional quantum states, or qubits. We report the experimental realization of the optimal quantum cloning of four-dimensional quantum states, or ququarts, encoded in the polarization and orbital angular momentum degrees of freedom of photons. Our procedure, based on the symmetrization method, is also shown to be generally applicable to quantum states of arbitr"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1009.2869","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":"2026-05-18T04:40:55Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"7GbLs2XE5j/2wRtLhOU3CzUnMM5ip0qEMiRlCfNtKhtCo6VAziVmDBRw1zTG00Z99cJWTiW1V2jEtaBT2N/QCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T03:43:10.059984Z"},"content_sha256":"2f6b167e030ab4a297eeefe9e4ddd7222986591261cdbddfdce2fd0a890521d9","schema_version":"1.0","event_id":"sha256:2f6b167e030ab4a297eeefe9e4ddd7222986591261cdbddfdce2fd0a890521d9"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/EEVSVDE7MR5HKWPYKPLYGIT4VH/bundle.json","state_url":"https://pith.science/pith/EEVSVDE7MR5HKWPYKPLYGIT4VH/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/EEVSVDE7MR5HKWPYKPLYGIT4VH/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":"2026-05-31T03:43:10Z","links":{"resolver":"https://pith.science/pith/EEVSVDE7MR5HKWPYKPLYGIT4VH","bundle":"https://pith.science/pith/EEVSVDE7MR5HKWPYKPLYGIT4VH/bundle.json","state":"https://pith.science/pith/EEVSVDE7MR5HKWPYKPLYGIT4VH/state.json","well_known_bundle":"https://pith.science/.well-known/pith/EEVSVDE7MR5HKWPYKPLYGIT4VH/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2010:EEVSVDE7MR5HKWPYKPLYGIT4VH","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":"06c4c9e75430ec37d7d8f96ffad5ccb8b4ef2c2703617ca51e2d4f20b07dec46","cross_cats_sorted":["physics.optics"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2010-09-15T09:14:00Z","title_canon_sha256":"ad2c54946ab09b89a937610f94a555fb5c095c2bb4691536660c47847a5af38e"},"schema_version":"1.0","source":{"id":"1009.2869","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1009.2869","created_at":"2026-05-18T04:40:55Z"},{"alias_kind":"arxiv_version","alias_value":"1009.2869v1","created_at":"2026-05-18T04:40:55Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1009.2869","created_at":"2026-05-18T04:40:55Z"},{"alias_kind":"pith_short_12","alias_value":"EEVSVDE7MR5H","created_at":"2026-05-18T12:26:06Z"},{"alias_kind":"pith_short_16","alias_value":"EEVSVDE7MR5HKWPY","created_at":"2026-05-18T12:26:06Z"},{"alias_kind":"pith_short_8","alias_value":"EEVSVDE7","created_at":"2026-05-18T12:26:06Z"}],"graph_snapshots":[{"event_id":"sha256:2f6b167e030ab4a297eeefe9e4ddd7222986591261cdbddfdce2fd0a890521d9","target":"graph","created_at":"2026-05-18T04:40:55Z","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":"Optimal quantum cloning is the process of making one or more copies of an arbitrary unknown input quantum state with the highest possible fidelity. All reported demonstrations of quantum cloning have so far been limited to copying two-dimensional quantum states, or qubits. We report the experimental realization of the optimal quantum cloning of four-dimensional quantum states, or ququarts, encoded in the polarization and orbital angular momentum degrees of freedom of photons. Our procedure, based on the symmetrization method, is also shown to be generally applicable to quantum states of arbitr","authors_text":"Daniele Giovannini, Eleonora Nagali, Enrico Santamato, Fabio Sciarrino, Lorenzo Marrucci, Sergei Slussarenko","cross_cats":["physics.optics"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2010-09-15T09:14:00Z","title":"Experimental optimal cloning of four-dimensional quantum states of photons"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1009.2869","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":"sha256:8f037a8e0949565499548527bd35a401f90c594b9f365f1527164ecae0ddd638","target":"record","created_at":"2026-05-18T04:40:55Z","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":"06c4c9e75430ec37d7d8f96ffad5ccb8b4ef2c2703617ca51e2d4f20b07dec46","cross_cats_sorted":["physics.optics"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2010-09-15T09:14:00Z","title_canon_sha256":"ad2c54946ab09b89a937610f94a555fb5c095c2bb4691536660c47847a5af38e"},"schema_version":"1.0","source":{"id":"1009.2869","kind":"arxiv","version":1}},"canonical_sha256":"212b2a8c9f647a7559f853d783227ca9eca863af7f6e1ae1745b4c9354a1829b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"212b2a8c9f647a7559f853d783227ca9eca863af7f6e1ae1745b4c9354a1829b","first_computed_at":"2026-05-18T04:40:55.378167Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:40:55.378167Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"jRIW8xTOnHWDgxRsCfxBxVWQyL/zEMOGwiLNJV3G+ETDoFngJn4vOFcMJQ+vlWJ69IFR6pqaXNE3zdpVwFb4Bg==","signature_status":"signed_v1","signed_at":"2026-05-18T04:40:55.378907Z","signed_message":"canonical_sha256_bytes"},"source_id":"1009.2869","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:8f037a8e0949565499548527bd35a401f90c594b9f365f1527164ecae0ddd638","sha256:2f6b167e030ab4a297eeefe9e4ddd7222986591261cdbddfdce2fd0a890521d9"],"state_sha256":"537c486704ccd50c02fbd6078cad891019b42e2926af3b566c1cc6549aaa1f00"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"opLbLMDiPCEEZrVy5U0bWQAtxKx1hqk+2IPELBYeQOhNHjDjZfenW994tioujIyAK10j0EScmd9Yj2ObzhW1DA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-31T03:43:10.063353Z","bundle_sha256":"74c2932e1ccf547842970b60f23cccad881702b6dca9e114caf6f2ccc78ecb13"}}