{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:1999:CSAG2C6CY6ZNKXLIRPWT52MTSL","short_pith_number":"pith:CSAG2C6C","canonical_record":{"source":{"id":"quant-ph/9907048","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"quant-ph","submitted_at":"1999-07-13T13:28:28Z","cross_cats_sorted":[],"title_canon_sha256":"23b72990c5d5eae69d5acfc01ad95b639e252c0231051d6b1ba0a519f9d2c040","abstract_canon_sha256":"07e6d157b41545f2fe316c6ff9b53edeabfadf362caad36788ccc7f070975d94"},"schema_version":"1.0"},"canonical_sha256":"14806d0bc2c7b2d55d688bed3ee99392d0d16b00854cafecc5f1a96ca1db96fc","source":{"kind":"arxiv","id":"quant-ph/9907048","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"quant-ph/9907048","created_at":"2026-07-04T16:15:43Z"},{"alias_kind":"arxiv_version","alias_value":"quant-ph/9907048v1","created_at":"2026-07-04T16:15:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.quant-ph/9907048","created_at":"2026-07-04T16:15:43Z"},{"alias_kind":"pith_short_12","alias_value":"CSAG2C6CY6ZN","created_at":"2026-07-04T16:15:43Z"},{"alias_kind":"pith_short_16","alias_value":"CSAG2C6CY6ZNKXLI","created_at":"2026-07-04T16:15:43Z"},{"alias_kind":"pith_short_8","alias_value":"CSAG2C6C","created_at":"2026-07-04T16:15:43Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:1999:CSAG2C6CY6ZNKXLIRPWT52MTSL","target":"record","payload":{"canonical_record":{"source":{"id":"quant-ph/9907048","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"quant-ph","submitted_at":"1999-07-13T13:28:28Z","cross_cats_sorted":[],"title_canon_sha256":"23b72990c5d5eae69d5acfc01ad95b639e252c0231051d6b1ba0a519f9d2c040","abstract_canon_sha256":"07e6d157b41545f2fe316c6ff9b53edeabfadf362caad36788ccc7f070975d94"},"schema_version":"1.0"},"canonical_sha256":"14806d0bc2c7b2d55d688bed3ee99392d0d16b00854cafecc5f1a96ca1db96fc","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T16:15:43.650009Z","signature_b64":"y3pBNVfEMwyE43sxNYp3rlfwN3SvSjh3Uz6VBn/6C+qoQjEDG97yrdyg/qdzqtGd7HlauTFIU6WcOQGqtcHEAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"14806d0bc2c7b2d55d688bed3ee99392d0d16b00854cafecc5f1a96ca1db96fc","last_reissued_at":"2026-07-04T16:15:43.649587Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T16:15:43.649587Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"quant-ph/9907048","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":"2026-07-04T16:15:43Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"OM70a3VgNc7PLH2P6HoaHDXtBb1lsf7/H27eDMx9lpWN8Uc6ZpQSrb8ijL/0pLfJE+3EhD5J/WPi+BJg1yqOBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-19T10:15:05.927881Z"},"content_sha256":"8e423ada29c7b557f5584ed1f756eb180c7a70ab2ac12b9ca3a0663ef7347fba","schema_version":"1.0","event_id":"sha256:8e423ada29c7b557f5584ed1f756eb180c7a70ab2ac12b9ca3a0663ef7347fba"},{"event_type":"graph_snapshot","subject_pith_number":"pith:1999:CSAG2C6CY6ZNKXLIRPWT52MTSL","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Continuous-variable teleportation improvement by photon subtraction via conditional measurement","license":"","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"D.-G. Welsch, G. Kurizki, T. Opatrny","submitted_at":"1999-07-13T13:28:28Z","abstract_excerpt":"We show that the recently proposed scheme of teleportation of continuous variables [S.L. Braunstein and H.J. Kimble, Phys. Rev. Lett. 80, 869 (1998)] can be improved by a conditional measurement in the preparation of the entangled state shared by the sender and the recipient. The conditional measurement subtracts photons from the original entangled two-mode squeezed vacuum, by transmitting each mode through a low-reflectivity beam splitter and performing a joint photon-number measurement on the reflected beams. In this way the degree of entanglement of the shared state is increased and so is t"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"quant-ph/9907048","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/quant-ph/9907048/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-04T16:15:43Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"83BzXpJcTK262L1LZkgZCpZM7nyBdsBgllA9FpxsxceCxNRGb70vcGFfZqG/CZe71boo2bkQEZ2crjRSGQAyBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-19T10:15:05.928251Z"},"content_sha256":"c4d0ef704fc5b6204e19cb0c5fb649c8db94b642935c1ed4417cc09cac47498b","schema_version":"1.0","event_id":"sha256:c4d0ef704fc5b6204e19cb0c5fb649c8db94b642935c1ed4417cc09cac47498b"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/CSAG2C6CY6ZNKXLIRPWT52MTSL/bundle.json","state_url":"https://pith.science/pith/CSAG2C6CY6ZNKXLIRPWT52MTSL/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/CSAG2C6CY6ZNKXLIRPWT52MTSL/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":"2026-07-19T10:15:05Z","links":{"resolver":"https://pith.science/pith/CSAG2C6CY6ZNKXLIRPWT52MTSL","bundle":"https://pith.science/pith/CSAG2C6CY6ZNKXLIRPWT52MTSL/bundle.json","state":"https://pith.science/pith/CSAG2C6CY6ZNKXLIRPWT52MTSL/state.json","well_known_bundle":"https://pith.science/.well-known/pith/CSAG2C6CY6ZNKXLIRPWT52MTSL/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:1999:CSAG2C6CY6ZNKXLIRPWT52MTSL","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":"07e6d157b41545f2fe316c6ff9b53edeabfadf362caad36788ccc7f070975d94","cross_cats_sorted":[],"license":"","primary_cat":"quant-ph","submitted_at":"1999-07-13T13:28:28Z","title_canon_sha256":"23b72990c5d5eae69d5acfc01ad95b639e252c0231051d6b1ba0a519f9d2c040"},"schema_version":"1.0","source":{"id":"quant-ph/9907048","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"quant-ph/9907048","created_at":"2026-07-04T16:15:43Z"},{"alias_kind":"arxiv_version","alias_value":"quant-ph/9907048v1","created_at":"2026-07-04T16:15:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.quant-ph/9907048","created_at":"2026-07-04T16:15:43Z"},{"alias_kind":"pith_short_12","alias_value":"CSAG2C6CY6ZN","created_at":"2026-07-04T16:15:43Z"},{"alias_kind":"pith_short_16","alias_value":"CSAG2C6CY6ZNKXLI","created_at":"2026-07-04T16:15:43Z"},{"alias_kind":"pith_short_8","alias_value":"CSAG2C6C","created_at":"2026-07-04T16:15:43Z"}],"graph_snapshots":[{"event_id":"sha256:c4d0ef704fc5b6204e19cb0c5fb649c8db94b642935c1ed4417cc09cac47498b","target":"graph","created_at":"2026-07-04T16:15:43Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/quant-ph/9907048/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We show that the recently proposed scheme of teleportation of continuous variables [S.L. Braunstein and H.J. Kimble, Phys. Rev. Lett. 80, 869 (1998)] can be improved by a conditional measurement in the preparation of the entangled state shared by the sender and the recipient. The conditional measurement subtracts photons from the original entangled two-mode squeezed vacuum, by transmitting each mode through a low-reflectivity beam splitter and performing a joint photon-number measurement on the reflected beams. In this way the degree of entanglement of the shared state is increased and so is t","authors_text":"D.-G. Welsch, G. Kurizki, T. Opatrny","cross_cats":[],"headline":"","license":"","primary_cat":"quant-ph","submitted_at":"1999-07-13T13:28:28Z","title":"Continuous-variable teleportation improvement by photon subtraction via conditional measurement"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"quant-ph/9907048","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":"sha256:8e423ada29c7b557f5584ed1f756eb180c7a70ab2ac12b9ca3a0663ef7347fba","target":"record","created_at":"2026-07-04T16:15:43Z","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":"07e6d157b41545f2fe316c6ff9b53edeabfadf362caad36788ccc7f070975d94","cross_cats_sorted":[],"license":"","primary_cat":"quant-ph","submitted_at":"1999-07-13T13:28:28Z","title_canon_sha256":"23b72990c5d5eae69d5acfc01ad95b639e252c0231051d6b1ba0a519f9d2c040"},"schema_version":"1.0","source":{"id":"quant-ph/9907048","kind":"arxiv","version":1}},"canonical_sha256":"14806d0bc2c7b2d55d688bed3ee99392d0d16b00854cafecc5f1a96ca1db96fc","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"14806d0bc2c7b2d55d688bed3ee99392d0d16b00854cafecc5f1a96ca1db96fc","first_computed_at":"2026-07-04T16:15:43.649587Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T16:15:43.649587Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"y3pBNVfEMwyE43sxNYp3rlfwN3SvSjh3Uz6VBn/6C+qoQjEDG97yrdyg/qdzqtGd7HlauTFIU6WcOQGqtcHEAw==","signature_status":"signed_v1","signed_at":"2026-07-04T16:15:43.650009Z","signed_message":"canonical_sha256_bytes"},"source_id":"quant-ph/9907048","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:8e423ada29c7b557f5584ed1f756eb180c7a70ab2ac12b9ca3a0663ef7347fba","sha256:c4d0ef704fc5b6204e19cb0c5fb649c8db94b642935c1ed4417cc09cac47498b"],"state_sha256":"74e842eb518b6910029568b2be435f84ee1898add3eaab1b448edaef212c2588"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"HId67oxkdqKgBqpiRpGXpzo1EzUahMU4YPcp+f03yMHg/19EIKSGcPrJxbKSQjScPsicJcKrhUELtsBKCp6rDw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-19T10:15:05.930307Z","bundle_sha256":"397d155523ff0ce5e78a6efeb82f6ac267f2e733cc2c445ac1dfb2a6ea9ef3a9"}}