{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:O4S2X5BN2I4S644CLEGQSDMVEG","short_pith_number":"pith:O4S2X5BN","canonical_record":{"source":{"id":"1504.00886","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2015-04-03T16:55:43Z","cross_cats_sorted":[],"title_canon_sha256":"b3012da352375add7a4e0a6d740299aa5514ea7ac4337d8585def7df5131a7ea","abstract_canon_sha256":"3ea1d7e539edbed8f1324ff74433712369ddb6422bdd594b52340d49d4bad201"},"schema_version":"1.0"},"canonical_sha256":"7725abf42dd2392f7382590d090d95218341151ed00a7fb4ac56878ff49e31a9","source":{"kind":"arxiv","id":"1504.00886","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1504.00886","created_at":"2026-05-18T01:26:10Z"},{"alias_kind":"arxiv_version","alias_value":"1504.00886v1","created_at":"2026-05-18T01:26:10Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1504.00886","created_at":"2026-05-18T01:26:10Z"},{"alias_kind":"pith_short_12","alias_value":"O4S2X5BN2I4S","created_at":"2026-05-18T12:29:34Z"},{"alias_kind":"pith_short_16","alias_value":"O4S2X5BN2I4S644C","created_at":"2026-05-18T12:29:34Z"},{"alias_kind":"pith_short_8","alias_value":"O4S2X5BN","created_at":"2026-05-18T12:29:34Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:O4S2X5BN2I4S644CLEGQSDMVEG","target":"record","payload":{"canonical_record":{"source":{"id":"1504.00886","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2015-04-03T16:55:43Z","cross_cats_sorted":[],"title_canon_sha256":"b3012da352375add7a4e0a6d740299aa5514ea7ac4337d8585def7df5131a7ea","abstract_canon_sha256":"3ea1d7e539edbed8f1324ff74433712369ddb6422bdd594b52340d49d4bad201"},"schema_version":"1.0"},"canonical_sha256":"7725abf42dd2392f7382590d090d95218341151ed00a7fb4ac56878ff49e31a9","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:26:10.413093Z","signature_b64":"aZfSr1Y6Z8t0P6ofEHfA2r0sh2tLyv5mZiWR8jeXoYvGUPFZqCl+aT98l9ZtB3/9Uv3fVUllVSpcenB1z8KMBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"7725abf42dd2392f7382590d090d95218341151ed00a7fb4ac56878ff49e31a9","last_reissued_at":"2026-05-18T01:26:10.412685Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:26:10.412685Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1504.00886","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":"2026-05-18T01:26:10Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"JFCKXC7MFkJOfvEd8evRXqzkm52flDIOFbHU0HxF7fTXtkRBxlXPwSOmQpOiEkJE0wLg9g7tBC0mDFhH/00iCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T07:29:40.268673Z"},"content_sha256":"d2f50ce6be594abc026d8cfe775dccc7bd45fe4bea27bb40fef88a8a7a68fabe","schema_version":"1.0","event_id":"sha256:d2f50ce6be594abc026d8cfe775dccc7bd45fe4bea27bb40fef88a8a7a68fabe"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:O4S2X5BN2I4S644CLEGQSDMVEG","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Undoing the effect of loss on quantum entanglement","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"A. I. Lvovsky, Alexander E. Ulanov, Anastasia A. Pushkina, Ilya A. Fedorov, Timothy C. Ralph, Yury V. Kurochkin","submitted_at":"2015-04-03T16:55:43Z","abstract_excerpt":"Entanglement distillation is a process via which the strength and purity of quantum entanglement can be increased probabilistically. It is a key step in many quantum communication and computation protocols. In particular, entanglement distillation is a necessary component of the quantum repeater, a device which counters the degradation of entanglement that inevitably occurs due to losses in a communication line. Here we report an experiment on distilling the Einstein-Podolsky-Rosen (EPR) state of light, the workhorse of continuous-variable entanglement, using the technique of noiseless amplifi"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1504.00886","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":"2026-05-18T01:26:10Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"jluwS3AjZXkmtd6E+BocPfWtzm6EVPIDUXiPi5E0itzv9PnD2RV1Rvy0bPLTkxjipDVERFPyywx8E6fNmUkTCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T07:29:40.269366Z"},"content_sha256":"a4d07be814afec208f93daed7bc4b2d39208201e195f6ba1f5a6cb3b2edf017f","schema_version":"1.0","event_id":"sha256:a4d07be814afec208f93daed7bc4b2d39208201e195f6ba1f5a6cb3b2edf017f"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/O4S2X5BN2I4S644CLEGQSDMVEG/bundle.json","state_url":"https://pith.science/pith/O4S2X5BN2I4S644CLEGQSDMVEG/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/O4S2X5BN2I4S644CLEGQSDMVEG/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":"2026-05-26T07:29:40Z","links":{"resolver":"https://pith.science/pith/O4S2X5BN2I4S644CLEGQSDMVEG","bundle":"https://pith.science/pith/O4S2X5BN2I4S644CLEGQSDMVEG/bundle.json","state":"https://pith.science/pith/O4S2X5BN2I4S644CLEGQSDMVEG/state.json","well_known_bundle":"https://pith.science/.well-known/pith/O4S2X5BN2I4S644CLEGQSDMVEG/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:O4S2X5BN2I4S644CLEGQSDMVEG","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":"3ea1d7e539edbed8f1324ff74433712369ddb6422bdd594b52340d49d4bad201","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2015-04-03T16:55:43Z","title_canon_sha256":"b3012da352375add7a4e0a6d740299aa5514ea7ac4337d8585def7df5131a7ea"},"schema_version":"1.0","source":{"id":"1504.00886","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1504.00886","created_at":"2026-05-18T01:26:10Z"},{"alias_kind":"arxiv_version","alias_value":"1504.00886v1","created_at":"2026-05-18T01:26:10Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1504.00886","created_at":"2026-05-18T01:26:10Z"},{"alias_kind":"pith_short_12","alias_value":"O4S2X5BN2I4S","created_at":"2026-05-18T12:29:34Z"},{"alias_kind":"pith_short_16","alias_value":"O4S2X5BN2I4S644C","created_at":"2026-05-18T12:29:34Z"},{"alias_kind":"pith_short_8","alias_value":"O4S2X5BN","created_at":"2026-05-18T12:29:34Z"}],"graph_snapshots":[{"event_id":"sha256:a4d07be814afec208f93daed7bc4b2d39208201e195f6ba1f5a6cb3b2edf017f","target":"graph","created_at":"2026-05-18T01:26:10Z","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":"Entanglement distillation is a process via which the strength and purity of quantum entanglement can be increased probabilistically. It is a key step in many quantum communication and computation protocols. In particular, entanglement distillation is a necessary component of the quantum repeater, a device which counters the degradation of entanglement that inevitably occurs due to losses in a communication line. Here we report an experiment on distilling the Einstein-Podolsky-Rosen (EPR) state of light, the workhorse of continuous-variable entanglement, using the technique of noiseless amplifi","authors_text":"A. I. Lvovsky, Alexander E. Ulanov, Anastasia A. Pushkina, Ilya A. Fedorov, Timothy C. Ralph, Yury V. Kurochkin","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2015-04-03T16:55:43Z","title":"Undoing the effect of loss on quantum entanglement"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1504.00886","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:d2f50ce6be594abc026d8cfe775dccc7bd45fe4bea27bb40fef88a8a7a68fabe","target":"record","created_at":"2026-05-18T01:26:10Z","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":"3ea1d7e539edbed8f1324ff74433712369ddb6422bdd594b52340d49d4bad201","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2015-04-03T16:55:43Z","title_canon_sha256":"b3012da352375add7a4e0a6d740299aa5514ea7ac4337d8585def7df5131a7ea"},"schema_version":"1.0","source":{"id":"1504.00886","kind":"arxiv","version":1}},"canonical_sha256":"7725abf42dd2392f7382590d090d95218341151ed00a7fb4ac56878ff49e31a9","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"7725abf42dd2392f7382590d090d95218341151ed00a7fb4ac56878ff49e31a9","first_computed_at":"2026-05-18T01:26:10.412685Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:26:10.412685Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"aZfSr1Y6Z8t0P6ofEHfA2r0sh2tLyv5mZiWR8jeXoYvGUPFZqCl+aT98l9ZtB3/9Uv3fVUllVSpcenB1z8KMBA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:26:10.413093Z","signed_message":"canonical_sha256_bytes"},"source_id":"1504.00886","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:d2f50ce6be594abc026d8cfe775dccc7bd45fe4bea27bb40fef88a8a7a68fabe","sha256:a4d07be814afec208f93daed7bc4b2d39208201e195f6ba1f5a6cb3b2edf017f"],"state_sha256":"7fcf2e0d8bf51d06d4fa8fc4cc4cbf2ffdd1753d148bff8d3ae32161de2cfbd6"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"xRr13vqhgwVJirxbHdzvg+vgSF9onT8bXU9ft7DRtm5pAUZ5bcKKeCZ1H88qXnZVT4Z/PCFwEnqK9dtJKODbAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T07:29:40.272687Z","bundle_sha256":"0f5f9d5fda9fb17c42c0c672a31d1e2a81c4be9498866aa1ebeb86948bc26eb5"}}