{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:3FMMGDWTMSIJTI44LBPCOGVO7H","short_pith_number":"pith:3FMMGDWT","canonical_record":{"source":{"id":"1509.01091","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2015-09-03T14:04:27Z","cross_cats_sorted":[],"title_canon_sha256":"3c2d16ed0b5313c96aa8220e9946af56a2c0f3f04f1db3501c18bd16eab39388","abstract_canon_sha256":"3ff06f978493df52f978c583096d0ec81b58fae911716c295bb2dae889fe69a4"},"schema_version":"1.0"},"canonical_sha256":"d958c30ed3649099a39c585e271aaef9ee15ca36db0a7b71b2a0da55c7dacacd","source":{"kind":"arxiv","id":"1509.01091","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1509.01091","created_at":"2026-05-18T01:33:41Z"},{"alias_kind":"arxiv_version","alias_value":"1509.01091v2","created_at":"2026-05-18T01:33:41Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1509.01091","created_at":"2026-05-18T01:33:41Z"},{"alias_kind":"pith_short_12","alias_value":"3FMMGDWTMSIJ","created_at":"2026-05-18T12:29:02Z"},{"alias_kind":"pith_short_16","alias_value":"3FMMGDWTMSIJTI44","created_at":"2026-05-18T12:29:02Z"},{"alias_kind":"pith_short_8","alias_value":"3FMMGDWT","created_at":"2026-05-18T12:29:02Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:3FMMGDWTMSIJTI44LBPCOGVO7H","target":"record","payload":{"canonical_record":{"source":{"id":"1509.01091","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2015-09-03T14:04:27Z","cross_cats_sorted":[],"title_canon_sha256":"3c2d16ed0b5313c96aa8220e9946af56a2c0f3f04f1db3501c18bd16eab39388","abstract_canon_sha256":"3ff06f978493df52f978c583096d0ec81b58fae911716c295bb2dae889fe69a4"},"schema_version":"1.0"},"canonical_sha256":"d958c30ed3649099a39c585e271aaef9ee15ca36db0a7b71b2a0da55c7dacacd","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:33:41.619661Z","signature_b64":"6K09wHBk0E+PK3AUFLKyKjs87RxZe2mzp2ENlCyKCoNEIUZk2d05dNMxTbDqpWAcPZ9nUiksKP5QrWbBUdTiCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"d958c30ed3649099a39c585e271aaef9ee15ca36db0a7b71b2a0da55c7dacacd","last_reissued_at":"2026-05-18T01:33:41.619117Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:33:41.619117Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1509.01091","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:33:41Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"sgoW/hER/xGVrjPqrIYphC0Nd4HmQnO7mv4Qkgk8VvfLHKRiRqYuxLUtUAHd0NkwOHMqntNZo7RBq/WZNQspAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-07T15:27:35.891636Z"},"content_sha256":"b92e9ce89e735db85ae414670d96636999811e29f5bf537e383f4f7e51d0e32a","schema_version":"1.0","event_id":"sha256:b92e9ce89e735db85ae414670d96636999811e29f5bf537e383f4f7e51d0e32a"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:3FMMGDWTMSIJTI44LBPCOGVO7H","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Restoring broken entanglement by separable correlations","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Gaetana Spedalieri, Stefano Pirandola","submitted_at":"2015-09-03T14:04:27Z","abstract_excerpt":"We consider two bosonic Gaussian channels whose thermal noise is strong enough to break bipartite entanglement. In this scenario, we show how the presence of separable correlations between the two channels is able to restore the broken entanglement. This reactivation occurs not only in a scheme of direct distribution, where a third party (Charlie) broadcasts entangled states to remote parties (Alice and Bob), but also in a configuration of indirect distribution which is based on entanglement swapping. In both schemes, the amount of entanglement remotely activated can be large enough to be dist"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1509.01091","kind":"arxiv","version":2},"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":"2026-05-18T01:33:41Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"fNluqZSoBmdVQIB2yeHvJRYfyrrty6ux0W5elgSNnL4GW1WmoBaHgBvj8PgoPQZrq1GibHjTL3POshkUmAv3DQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-07T15:27:35.892277Z"},"content_sha256":"7af28e10310e6d1dd6213099325153c07583a92fc50886176c64d60a2421eced","schema_version":"1.0","event_id":"sha256:7af28e10310e6d1dd6213099325153c07583a92fc50886176c64d60a2421eced"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/3FMMGDWTMSIJTI44LBPCOGVO7H/bundle.json","state_url":"https://pith.science/pith/3FMMGDWTMSIJTI44LBPCOGVO7H/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/3FMMGDWTMSIJTI44LBPCOGVO7H/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":"2026-06-07T15:27:35Z","links":{"resolver":"https://pith.science/pith/3FMMGDWTMSIJTI44LBPCOGVO7H","bundle":"https://pith.science/pith/3FMMGDWTMSIJTI44LBPCOGVO7H/bundle.json","state":"https://pith.science/pith/3FMMGDWTMSIJTI44LBPCOGVO7H/state.json","well_known_bundle":"https://pith.science/.well-known/pith/3FMMGDWTMSIJTI44LBPCOGVO7H/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:3FMMGDWTMSIJTI44LBPCOGVO7H","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":"3ff06f978493df52f978c583096d0ec81b58fae911716c295bb2dae889fe69a4","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2015-09-03T14:04:27Z","title_canon_sha256":"3c2d16ed0b5313c96aa8220e9946af56a2c0f3f04f1db3501c18bd16eab39388"},"schema_version":"1.0","source":{"id":"1509.01091","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1509.01091","created_at":"2026-05-18T01:33:41Z"},{"alias_kind":"arxiv_version","alias_value":"1509.01091v2","created_at":"2026-05-18T01:33:41Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1509.01091","created_at":"2026-05-18T01:33:41Z"},{"alias_kind":"pith_short_12","alias_value":"3FMMGDWTMSIJ","created_at":"2026-05-18T12:29:02Z"},{"alias_kind":"pith_short_16","alias_value":"3FMMGDWTMSIJTI44","created_at":"2026-05-18T12:29:02Z"},{"alias_kind":"pith_short_8","alias_value":"3FMMGDWT","created_at":"2026-05-18T12:29:02Z"}],"graph_snapshots":[{"event_id":"sha256:7af28e10310e6d1dd6213099325153c07583a92fc50886176c64d60a2421eced","target":"graph","created_at":"2026-05-18T01:33:41Z","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 consider two bosonic Gaussian channels whose thermal noise is strong enough to break bipartite entanglement. In this scenario, we show how the presence of separable correlations between the two channels is able to restore the broken entanglement. This reactivation occurs not only in a scheme of direct distribution, where a third party (Charlie) broadcasts entangled states to remote parties (Alice and Bob), but also in a configuration of indirect distribution which is based on entanglement swapping. In both schemes, the amount of entanglement remotely activated can be large enough to be dist","authors_text":"Gaetana Spedalieri, Stefano Pirandola","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2015-09-03T14:04:27Z","title":"Restoring broken entanglement by separable correlations"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1509.01091","kind":"arxiv","version":2},"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:b92e9ce89e735db85ae414670d96636999811e29f5bf537e383f4f7e51d0e32a","target":"record","created_at":"2026-05-18T01:33:41Z","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":"3ff06f978493df52f978c583096d0ec81b58fae911716c295bb2dae889fe69a4","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2015-09-03T14:04:27Z","title_canon_sha256":"3c2d16ed0b5313c96aa8220e9946af56a2c0f3f04f1db3501c18bd16eab39388"},"schema_version":"1.0","source":{"id":"1509.01091","kind":"arxiv","version":2}},"canonical_sha256":"d958c30ed3649099a39c585e271aaef9ee15ca36db0a7b71b2a0da55c7dacacd","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"d958c30ed3649099a39c585e271aaef9ee15ca36db0a7b71b2a0da55c7dacacd","first_computed_at":"2026-05-18T01:33:41.619117Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:33:41.619117Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"6K09wHBk0E+PK3AUFLKyKjs87RxZe2mzp2ENlCyKCoNEIUZk2d05dNMxTbDqpWAcPZ9nUiksKP5QrWbBUdTiCA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:33:41.619661Z","signed_message":"canonical_sha256_bytes"},"source_id":"1509.01091","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b92e9ce89e735db85ae414670d96636999811e29f5bf537e383f4f7e51d0e32a","sha256:7af28e10310e6d1dd6213099325153c07583a92fc50886176c64d60a2421eced"],"state_sha256":"f7e1d3023e1b3635c59b64fdc52efd6e38b46dc6ac2d134a96d982db529072d3"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"puuB88Rb5akkTzjL7vNrIVM7IbEL5PNJg7Cf8mf+byRJu6XfCai+bCZwRhi7DiAJjyW+rT4J623OCmQsWdPjDg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-07T15:27:35.896366Z","bundle_sha256":"40ac4ddbc3dd3aeb7d2a712a471d8c02d5c717f813c186bfec9a598b48b9430d"}}