{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2011:QNJYMRP257S4GG22NV5U3MDXBN","short_pith_number":"pith:QNJYMRP2","canonical_record":{"source":{"id":"1105.6058","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2011-05-30T18:17:20Z","cross_cats_sorted":[],"title_canon_sha256":"24f7abc398ec0cb328b5acd5447db6da3556040ec28976beb96a7f27aa085659","abstract_canon_sha256":"654cfb38af5c43114b63149abcf305469c730da19590fa19a0dcb611aa8d9212"},"schema_version":"1.0"},"canonical_sha256":"83538645faefe5c31b5a6d7b4db0770b5ad84970e242efb2584190c821e11614","source":{"kind":"arxiv","id":"1105.6058","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1105.6058","created_at":"2026-05-18T03:54:06Z"},{"alias_kind":"arxiv_version","alias_value":"1105.6058v1","created_at":"2026-05-18T03:54:06Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1105.6058","created_at":"2026-05-18T03:54:06Z"},{"alias_kind":"pith_short_12","alias_value":"QNJYMRP257S4","created_at":"2026-05-18T12:26:39Z"},{"alias_kind":"pith_short_16","alias_value":"QNJYMRP257S4GG22","created_at":"2026-05-18T12:26:39Z"},{"alias_kind":"pith_short_8","alias_value":"QNJYMRP2","created_at":"2026-05-18T12:26:39Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2011:QNJYMRP257S4GG22NV5U3MDXBN","target":"record","payload":{"canonical_record":{"source":{"id":"1105.6058","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2011-05-30T18:17:20Z","cross_cats_sorted":[],"title_canon_sha256":"24f7abc398ec0cb328b5acd5447db6da3556040ec28976beb96a7f27aa085659","abstract_canon_sha256":"654cfb38af5c43114b63149abcf305469c730da19590fa19a0dcb611aa8d9212"},"schema_version":"1.0"},"canonical_sha256":"83538645faefe5c31b5a6d7b4db0770b5ad84970e242efb2584190c821e11614","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:54:06.184510Z","signature_b64":"evHEx4bScIEAj5abzuNFbJVnXowfKNpiI0x6XjexOR+GF/44hcjPOKijXF20YNS4JYNP6NZu+4VB1tfUNIgPCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"83538645faefe5c31b5a6d7b4db0770b5ad84970e242efb2584190c821e11614","last_reissued_at":"2026-05-18T03:54:06.183801Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:54:06.183801Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1105.6058","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":"2026-05-18T03:54:06Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"nHTrmH1eykGOBbjFhLfutAosK9tI5rn0PfourE9ZILnKeSKjxijKgRFt9Af4aFCByZIPN5jzuNVW480f0WhlBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T18:36:50.426118Z"},"content_sha256":"2eb6e20b55511665cf81f84e6727c31ce41c8f60fa172c50e1c3dbd0c809a15e","schema_version":"1.0","event_id":"sha256:2eb6e20b55511665cf81f84e6727c31ce41c8f60fa172c50e1c3dbd0c809a15e"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2011:QNJYMRP257S4GG22NV5U3MDXBN","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Long quantum channels for high-quality entanglement transfer","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Alessandro Cuccoli, Leonardo Banchi, Paola Verrucchi, Ruggero Vaia, Tony John George Apollaro","submitted_at":"2011-05-30T18:17:20Z","abstract_excerpt":"High-quality quantum-state and entanglement transfer can be achieved in an unmodulated spin bus operating in the ballistic regime, which occurs when the endpoint qubits A and B are coupled to the chain by an exchange interaction $j_0$ comparable with the intrachain exchange. Indeed, the transition amplitude characterizing the transfer quality exhibits a maximum for a finite optimal value $j_0^{opt}(N)$, where $N$ is the channel length. We show that $j_0^{opt}(N)$ scales as $N^{-1/6}$ for large $N$ and that it ensures a high-quality entanglement transfer even in the limit of arbitrarily long ch"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1105.6058","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":"2026-05-18T03:54:06Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"TXPmpnTegi5cP2eb7Lq4Sb9Uw37nvwhlLgbXJhe+Bpl+eMUfELRZ/y3+Lmd4W/sYwP8ub2YLMZaUYM19MoruAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T18:36:50.426489Z"},"content_sha256":"8da2becd5975756eb8006a42383a732ea8eb763c30f315bebd88dc865470dc3e","schema_version":"1.0","event_id":"sha256:8da2becd5975756eb8006a42383a732ea8eb763c30f315bebd88dc865470dc3e"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/QNJYMRP257S4GG22NV5U3MDXBN/bundle.json","state_url":"https://pith.science/pith/QNJYMRP257S4GG22NV5U3MDXBN/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/QNJYMRP257S4GG22NV5U3MDXBN/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":"2026-05-27T18:36:50Z","links":{"resolver":"https://pith.science/pith/QNJYMRP257S4GG22NV5U3MDXBN","bundle":"https://pith.science/pith/QNJYMRP257S4GG22NV5U3MDXBN/bundle.json","state":"https://pith.science/pith/QNJYMRP257S4GG22NV5U3MDXBN/state.json","well_known_bundle":"https://pith.science/.well-known/pith/QNJYMRP257S4GG22NV5U3MDXBN/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2011:QNJYMRP257S4GG22NV5U3MDXBN","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":"654cfb38af5c43114b63149abcf305469c730da19590fa19a0dcb611aa8d9212","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2011-05-30T18:17:20Z","title_canon_sha256":"24f7abc398ec0cb328b5acd5447db6da3556040ec28976beb96a7f27aa085659"},"schema_version":"1.0","source":{"id":"1105.6058","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1105.6058","created_at":"2026-05-18T03:54:06Z"},{"alias_kind":"arxiv_version","alias_value":"1105.6058v1","created_at":"2026-05-18T03:54:06Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1105.6058","created_at":"2026-05-18T03:54:06Z"},{"alias_kind":"pith_short_12","alias_value":"QNJYMRP257S4","created_at":"2026-05-18T12:26:39Z"},{"alias_kind":"pith_short_16","alias_value":"QNJYMRP257S4GG22","created_at":"2026-05-18T12:26:39Z"},{"alias_kind":"pith_short_8","alias_value":"QNJYMRP2","created_at":"2026-05-18T12:26:39Z"}],"graph_snapshots":[{"event_id":"sha256:8da2becd5975756eb8006a42383a732ea8eb763c30f315bebd88dc865470dc3e","target":"graph","created_at":"2026-05-18T03:54:06Z","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":"High-quality quantum-state and entanglement transfer can be achieved in an unmodulated spin bus operating in the ballistic regime, which occurs when the endpoint qubits A and B are coupled to the chain by an exchange interaction $j_0$ comparable with the intrachain exchange. Indeed, the transition amplitude characterizing the transfer quality exhibits a maximum for a finite optimal value $j_0^{opt}(N)$, where $N$ is the channel length. We show that $j_0^{opt}(N)$ scales as $N^{-1/6}$ for large $N$ and that it ensures a high-quality entanglement transfer even in the limit of arbitrarily long ch","authors_text":"Alessandro Cuccoli, Leonardo Banchi, Paola Verrucchi, Ruggero Vaia, Tony John George Apollaro","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2011-05-30T18:17:20Z","title":"Long quantum channels for high-quality entanglement transfer"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1105.6058","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":"sha256:2eb6e20b55511665cf81f84e6727c31ce41c8f60fa172c50e1c3dbd0c809a15e","target":"record","created_at":"2026-05-18T03:54:06Z","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":"654cfb38af5c43114b63149abcf305469c730da19590fa19a0dcb611aa8d9212","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2011-05-30T18:17:20Z","title_canon_sha256":"24f7abc398ec0cb328b5acd5447db6da3556040ec28976beb96a7f27aa085659"},"schema_version":"1.0","source":{"id":"1105.6058","kind":"arxiv","version":1}},"canonical_sha256":"83538645faefe5c31b5a6d7b4db0770b5ad84970e242efb2584190c821e11614","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"83538645faefe5c31b5a6d7b4db0770b5ad84970e242efb2584190c821e11614","first_computed_at":"2026-05-18T03:54:06.183801Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:54:06.183801Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"evHEx4bScIEAj5abzuNFbJVnXowfKNpiI0x6XjexOR+GF/44hcjPOKijXF20YNS4JYNP6NZu+4VB1tfUNIgPCA==","signature_status":"signed_v1","signed_at":"2026-05-18T03:54:06.184510Z","signed_message":"canonical_sha256_bytes"},"source_id":"1105.6058","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:2eb6e20b55511665cf81f84e6727c31ce41c8f60fa172c50e1c3dbd0c809a15e","sha256:8da2becd5975756eb8006a42383a732ea8eb763c30f315bebd88dc865470dc3e"],"state_sha256":"a69418a73cc732ad20f7d4493814ecb20ac3d4199aadc3e0b070560f49d65c98"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"a0ql2G2+fHm6iwHVPcocCmGOZHU3Jnb+GaY+M+NpJtf2N24bmrQlq/I/iQ2Es2I/CN/oGBlSRO92jeEISKkMBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-27T18:36:50.428619Z","bundle_sha256":"00c29b47583eb6dc6d55323c28842a663212a7e9f185073b0a5cc99005c64a45"}}