{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2014:46L4HQLN6W5R6AL3BVG2ALVYPW","short_pith_number":"pith:46L4HQLN","canonical_record":{"source":{"id":"1402.5927","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2014-02-24T19:40:55Z","cross_cats_sorted":["cs.IT","math.IT"],"title_canon_sha256":"5f63946dce95f3b28c31c0b9f66a2e0fc4067b60001338d74d64c262657ffd66","abstract_canon_sha256":"9096a106068fb10f99879bae7698409ab97836d7d6250c22e0fad769cb727213"},"schema_version":"1.0"},"canonical_sha256":"e797c3c16df5bb1f017b0d4da02eb87db6ef0a34469fe895d7589ab24d5c0ad5","source":{"kind":"arxiv","id":"1402.5927","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1402.5927","created_at":"2026-05-18T02:17:52Z"},{"alias_kind":"arxiv_version","alias_value":"1402.5927v2","created_at":"2026-05-18T02:17:52Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1402.5927","created_at":"2026-05-18T02:17:52Z"},{"alias_kind":"pith_short_12","alias_value":"46L4HQLN6W5R","created_at":"2026-05-18T12:28:14Z"},{"alias_kind":"pith_short_16","alias_value":"46L4HQLN6W5R6AL3","created_at":"2026-05-18T12:28:14Z"},{"alias_kind":"pith_short_8","alias_value":"46L4HQLN","created_at":"2026-05-18T12:28:14Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2014:46L4HQLN6W5R6AL3BVG2ALVYPW","target":"record","payload":{"canonical_record":{"source":{"id":"1402.5927","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2014-02-24T19:40:55Z","cross_cats_sorted":["cs.IT","math.IT"],"title_canon_sha256":"5f63946dce95f3b28c31c0b9f66a2e0fc4067b60001338d74d64c262657ffd66","abstract_canon_sha256":"9096a106068fb10f99879bae7698409ab97836d7d6250c22e0fad769cb727213"},"schema_version":"1.0"},"canonical_sha256":"e797c3c16df5bb1f017b0d4da02eb87db6ef0a34469fe895d7589ab24d5c0ad5","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:17:52.235666Z","signature_b64":"C4m5u2SWDHVBtFCvJCN5TA6lDT46V/QDxugIwnFcy4x7MupxuNaoKNiCm2ev60QTSF6QUCCly5wVFe9AxnwXDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e797c3c16df5bb1f017b0d4da02eb87db6ef0a34469fe895d7589ab24d5c0ad5","last_reissued_at":"2026-05-18T02:17:52.235109Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:17:52.235109Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1402.5927","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":"2026-05-18T02:17:52Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"vX43QO1oJS6HV0s+E3iql3OJ34xzSDHN+2M6zJxQMebsiKn4I8etkKWKWUrh2BM/p0tVonk0n8poTyvWR8Y7Cg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T12:37:47.897866Z"},"content_sha256":"8b80a4fc179449d034279953decb049d1c3bcd461a8fb18447da55fc23404450","schema_version":"1.0","event_id":"sha256:8b80a4fc179449d034279953decb049d1c3bcd461a8fb18447da55fc23404450"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2014:46L4HQLN6W5R6AL3BVG2ALVYPW","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Limitations on Quantum Key Repeaters","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cs.IT","math.IT"],"primary_cat":"quant-ph","authors_text":"Andreas Winter, Karol Horodecki, Matthias Christandl, Stefan B\\\"auml","submitted_at":"2014-02-24T19:40:55Z","abstract_excerpt":"A major application of quantum communication is the distribution of entangled particles for use in quantum key distribution (QKD). Due to noise in the communication line, QKD is in practice limited to a distance of a few hundred kilometres, and can only be extended to longer distances by use of a quantum repeater, a device which performs entanglement distillation and quantum teleportation. The existence of noisy entangled states that are undistillable but nevertheless useful for QKD raises the question of the feasibility of a quantum key repeater, which would work beyond the limits of entangle"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1402.5927","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":"2026-05-18T02:17:52Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Xo034kqednfdpNY8qHTI6cLVn10QJrXI5NCRM38KDfz3GSoyYvRVjRQMD1ykc52SW2PZiNCWDldcUiL6J8rCAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T12:37:47.898218Z"},"content_sha256":"6707d8cc569ba67d132153dbd16295bb59b884a04bced50cde8f5b0421c60dad","schema_version":"1.0","event_id":"sha256:6707d8cc569ba67d132153dbd16295bb59b884a04bced50cde8f5b0421c60dad"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/46L4HQLN6W5R6AL3BVG2ALVYPW/bundle.json","state_url":"https://pith.science/pith/46L4HQLN6W5R6AL3BVG2ALVYPW/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/46L4HQLN6W5R6AL3BVG2ALVYPW/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":"2026-06-03T12:37:47Z","links":{"resolver":"https://pith.science/pith/46L4HQLN6W5R6AL3BVG2ALVYPW","bundle":"https://pith.science/pith/46L4HQLN6W5R6AL3BVG2ALVYPW/bundle.json","state":"https://pith.science/pith/46L4HQLN6W5R6AL3BVG2ALVYPW/state.json","well_known_bundle":"https://pith.science/.well-known/pith/46L4HQLN6W5R6AL3BVG2ALVYPW/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:46L4HQLN6W5R6AL3BVG2ALVYPW","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":"9096a106068fb10f99879bae7698409ab97836d7d6250c22e0fad769cb727213","cross_cats_sorted":["cs.IT","math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2014-02-24T19:40:55Z","title_canon_sha256":"5f63946dce95f3b28c31c0b9f66a2e0fc4067b60001338d74d64c262657ffd66"},"schema_version":"1.0","source":{"id":"1402.5927","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1402.5927","created_at":"2026-05-18T02:17:52Z"},{"alias_kind":"arxiv_version","alias_value":"1402.5927v2","created_at":"2026-05-18T02:17:52Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1402.5927","created_at":"2026-05-18T02:17:52Z"},{"alias_kind":"pith_short_12","alias_value":"46L4HQLN6W5R","created_at":"2026-05-18T12:28:14Z"},{"alias_kind":"pith_short_16","alias_value":"46L4HQLN6W5R6AL3","created_at":"2026-05-18T12:28:14Z"},{"alias_kind":"pith_short_8","alias_value":"46L4HQLN","created_at":"2026-05-18T12:28:14Z"}],"graph_snapshots":[{"event_id":"sha256:6707d8cc569ba67d132153dbd16295bb59b884a04bced50cde8f5b0421c60dad","target":"graph","created_at":"2026-05-18T02:17:52Z","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":"A major application of quantum communication is the distribution of entangled particles for use in quantum key distribution (QKD). Due to noise in the communication line, QKD is in practice limited to a distance of a few hundred kilometres, and can only be extended to longer distances by use of a quantum repeater, a device which performs entanglement distillation and quantum teleportation. The existence of noisy entangled states that are undistillable but nevertheless useful for QKD raises the question of the feasibility of a quantum key repeater, which would work beyond the limits of entangle","authors_text":"Andreas Winter, Karol Horodecki, Matthias Christandl, Stefan B\\\"auml","cross_cats":["cs.IT","math.IT"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2014-02-24T19:40:55Z","title":"Limitations on Quantum Key Repeaters"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1402.5927","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":"sha256:8b80a4fc179449d034279953decb049d1c3bcd461a8fb18447da55fc23404450","target":"record","created_at":"2026-05-18T02:17:52Z","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":"9096a106068fb10f99879bae7698409ab97836d7d6250c22e0fad769cb727213","cross_cats_sorted":["cs.IT","math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2014-02-24T19:40:55Z","title_canon_sha256":"5f63946dce95f3b28c31c0b9f66a2e0fc4067b60001338d74d64c262657ffd66"},"schema_version":"1.0","source":{"id":"1402.5927","kind":"arxiv","version":2}},"canonical_sha256":"e797c3c16df5bb1f017b0d4da02eb87db6ef0a34469fe895d7589ab24d5c0ad5","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"e797c3c16df5bb1f017b0d4da02eb87db6ef0a34469fe895d7589ab24d5c0ad5","first_computed_at":"2026-05-18T02:17:52.235109Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:17:52.235109Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"C4m5u2SWDHVBtFCvJCN5TA6lDT46V/QDxugIwnFcy4x7MupxuNaoKNiCm2ev60QTSF6QUCCly5wVFe9AxnwXDg==","signature_status":"signed_v1","signed_at":"2026-05-18T02:17:52.235666Z","signed_message":"canonical_sha256_bytes"},"source_id":"1402.5927","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:8b80a4fc179449d034279953decb049d1c3bcd461a8fb18447da55fc23404450","sha256:6707d8cc569ba67d132153dbd16295bb59b884a04bced50cde8f5b0421c60dad"],"state_sha256":"0ac090b09ed392733c2f14d3c8926c63c44b2f7a2799a0a015fced380d5bff23"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"60hDBnCe0xMm3SM8qY3O/f0bpjUrEU5dABG6TydOfv3dwQ9hWslIEnJiUnXRjUDsiHsTawdvC1b2OGzm8XcwBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-03T12:37:47.900169Z","bundle_sha256":"7021a355ef798716593479873f96e71ce3a5931762fb3c6dcc881f78f34321f2"}}