{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:1997:AZBR47FE4NIVEWAICEENPVTSI3","short_pith_number":"pith:AZBR47FE","canonical_record":{"source":{"id":"quant-ph/9705044","kind":"arxiv","version":2},"metadata":{"license":"","primary_cat":"quant-ph","submitted_at":"1997-05-26T10:11:06Z","cross_cats_sorted":[],"title_canon_sha256":"79178fb8b01ca1208d7e5221e7f49a72ce208d0bc4d4fa26d12082c0139527eb","abstract_canon_sha256":"23e3526dfaec3650a60f63f3105c7b2240cce56848526a05c2324c42c0acd2f0"},"schema_version":"1.0"},"canonical_sha256":"06431e7ca4e3515258081108d7d67246f946ce6e1c929b4a1d9ee345eeff843a","source":{"kind":"arxiv","id":"quant-ph/9705044","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"quant-ph/9705044","created_at":"2026-07-04T15:36:42Z"},{"alias_kind":"arxiv_version","alias_value":"quant-ph/9705044v2","created_at":"2026-07-04T15:36:42Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.quant-ph/9705044","created_at":"2026-07-04T15:36:42Z"},{"alias_kind":"pith_short_12","alias_value":"AZBR47FE4NIV","created_at":"2026-07-04T15:36:42Z"},{"alias_kind":"pith_short_16","alias_value":"AZBR47FE4NIVEWAI","created_at":"2026-07-04T15:36:42Z"},{"alias_kind":"pith_short_8","alias_value":"AZBR47FE","created_at":"2026-07-04T15:36:42Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:1997:AZBR47FE4NIVEWAICEENPVTSI3","target":"record","payload":{"canonical_record":{"source":{"id":"quant-ph/9705044","kind":"arxiv","version":2},"metadata":{"license":"","primary_cat":"quant-ph","submitted_at":"1997-05-26T10:11:06Z","cross_cats_sorted":[],"title_canon_sha256":"79178fb8b01ca1208d7e5221e7f49a72ce208d0bc4d4fa26d12082c0139527eb","abstract_canon_sha256":"23e3526dfaec3650a60f63f3105c7b2240cce56848526a05c2324c42c0acd2f0"},"schema_version":"1.0"},"canonical_sha256":"06431e7ca4e3515258081108d7d67246f946ce6e1c929b4a1d9ee345eeff843a","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T15:36:42.037206Z","signature_b64":"iM9sfNLwqrFx4cKk+CUpnyrXreVRgwdvWuq5aeLq9gXEqvcEabx0LNbbYWzGXRKH9rCrtNx3IYQt0H+vl8ctDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"06431e7ca4e3515258081108d7d67246f946ce6e1c929b4a1d9ee345eeff843a","last_reissued_at":"2026-07-04T15:36:42.036814Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T15:36:42.036814Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"quant-ph/9705044","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":"2026-07-04T15:36:42Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"7bisWbPWyxnIdGeiRh0P4FeKlgdpScFfa3+4D4ugZj3lB7mWof331m10c6IKqMGgAiruBdc94KzqiQcA4OM3DA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-08T08:34:20.009758Z"},"content_sha256":"a68e5a04454bd140ba9021da454075690478aed337ae0afcc3321e6c636991d1","schema_version":"1.0","event_id":"sha256:a68e5a04454bd140ba9021da454075690478aed337ae0afcc3321e6c636991d1"},{"event_type":"graph_snapshot","subject_pith_number":"pith:1997:AZBR47FE4NIVEWAICEENPVTSI3","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Noiseless Quantum Codes","license":"","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"3), 3) ((1) ISI Foundation, (3) INFM Politecnico di Torino), M. Rasetti (2, Politecnico di Torino, P. Zanardi (1, Torino (2) Dipartimento di fisica","submitted_at":"1997-05-26T10:11:06Z","abstract_excerpt":"In this paper we study a model quantum register $\\cal R$ made of $N$ replicas (cells) of a given finite-dimensional quantum system S. Assuming that all cells are coupled with a common environment with equal strength we show that, for $N$ large enough, in the Hilbert space of $\\cal R$ there exists a linear subspace ${\\cal C}_N$ which is dynamically decoupled from the environment. The states in ${\\cal C}_N$ evolve unitarily and are therefore decoherence-dissipation free. The space ${\\cal C}_N$ realizes a noiseless quantum code in which information can be stored, in principle, for arbitrarily lon"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"quant-ph/9705044","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/quant-ph/9705044/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":"2026-07-04T15:36:42Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+I8zHgeuRWEw0y/vmEgwimQtVk9w6tX7tl08C9vEAI0N66MeaIgc6LvZlrCZBXZMjtUr2siN4MDwZhRFOFDIAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-08T08:34:20.010731Z"},"content_sha256":"bff52cbc3278334f9a7759f5f1fa2f8aa719e2b328b15cd8e87cc7afcf1dc1ba","schema_version":"1.0","event_id":"sha256:bff52cbc3278334f9a7759f5f1fa2f8aa719e2b328b15cd8e87cc7afcf1dc1ba"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/AZBR47FE4NIVEWAICEENPVTSI3/bundle.json","state_url":"https://pith.science/pith/AZBR47FE4NIVEWAICEENPVTSI3/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/AZBR47FE4NIVEWAICEENPVTSI3/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":"2026-08-08T08:34:20Z","links":{"resolver":"https://pith.science/pith/AZBR47FE4NIVEWAICEENPVTSI3","bundle":"https://pith.science/pith/AZBR47FE4NIVEWAICEENPVTSI3/bundle.json","state":"https://pith.science/pith/AZBR47FE4NIVEWAICEENPVTSI3/state.json","well_known_bundle":"https://pith.science/.well-known/pith/AZBR47FE4NIVEWAICEENPVTSI3/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:1997:AZBR47FE4NIVEWAICEENPVTSI3","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":"23e3526dfaec3650a60f63f3105c7b2240cce56848526a05c2324c42c0acd2f0","cross_cats_sorted":[],"license":"","primary_cat":"quant-ph","submitted_at":"1997-05-26T10:11:06Z","title_canon_sha256":"79178fb8b01ca1208d7e5221e7f49a72ce208d0bc4d4fa26d12082c0139527eb"},"schema_version":"1.0","source":{"id":"quant-ph/9705044","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"quant-ph/9705044","created_at":"2026-07-04T15:36:42Z"},{"alias_kind":"arxiv_version","alias_value":"quant-ph/9705044v2","created_at":"2026-07-04T15:36:42Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.quant-ph/9705044","created_at":"2026-07-04T15:36:42Z"},{"alias_kind":"pith_short_12","alias_value":"AZBR47FE4NIV","created_at":"2026-07-04T15:36:42Z"},{"alias_kind":"pith_short_16","alias_value":"AZBR47FE4NIVEWAI","created_at":"2026-07-04T15:36:42Z"},{"alias_kind":"pith_short_8","alias_value":"AZBR47FE","created_at":"2026-07-04T15:36:42Z"}],"graph_snapshots":[{"event_id":"sha256:bff52cbc3278334f9a7759f5f1fa2f8aa719e2b328b15cd8e87cc7afcf1dc1ba","target":"graph","created_at":"2026-07-04T15:36:42Z","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/9705044/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"In this paper we study a model quantum register $\\cal R$ made of $N$ replicas (cells) of a given finite-dimensional quantum system S. Assuming that all cells are coupled with a common environment with equal strength we show that, for $N$ large enough, in the Hilbert space of $\\cal R$ there exists a linear subspace ${\\cal C}_N$ which is dynamically decoupled from the environment. The states in ${\\cal C}_N$ evolve unitarily and are therefore decoherence-dissipation free. The space ${\\cal C}_N$ realizes a noiseless quantum code in which information can be stored, in principle, for arbitrarily lon","authors_text":"3), 3) ((1) ISI Foundation, (3) INFM Politecnico di Torino), M. Rasetti (2, Politecnico di Torino, P. Zanardi (1, Torino (2) Dipartimento di fisica","cross_cats":[],"headline":"","license":"","primary_cat":"quant-ph","submitted_at":"1997-05-26T10:11:06Z","title":"Noiseless Quantum Codes"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"quant-ph/9705044","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:a68e5a04454bd140ba9021da454075690478aed337ae0afcc3321e6c636991d1","target":"record","created_at":"2026-07-04T15:36:42Z","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":"23e3526dfaec3650a60f63f3105c7b2240cce56848526a05c2324c42c0acd2f0","cross_cats_sorted":[],"license":"","primary_cat":"quant-ph","submitted_at":"1997-05-26T10:11:06Z","title_canon_sha256":"79178fb8b01ca1208d7e5221e7f49a72ce208d0bc4d4fa26d12082c0139527eb"},"schema_version":"1.0","source":{"id":"quant-ph/9705044","kind":"arxiv","version":2}},"canonical_sha256":"06431e7ca4e3515258081108d7d67246f946ce6e1c929b4a1d9ee345eeff843a","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"06431e7ca4e3515258081108d7d67246f946ce6e1c929b4a1d9ee345eeff843a","first_computed_at":"2026-07-04T15:36:42.036814Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T15:36:42.036814Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"iM9sfNLwqrFx4cKk+CUpnyrXreVRgwdvWuq5aeLq9gXEqvcEabx0LNbbYWzGXRKH9rCrtNx3IYQt0H+vl8ctDQ==","signature_status":"signed_v1","signed_at":"2026-07-04T15:36:42.037206Z","signed_message":"canonical_sha256_bytes"},"source_id":"quant-ph/9705044","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a68e5a04454bd140ba9021da454075690478aed337ae0afcc3321e6c636991d1","sha256:bff52cbc3278334f9a7759f5f1fa2f8aa719e2b328b15cd8e87cc7afcf1dc1ba"],"state_sha256":"ec8427dd96d2634d5f160619bc11f1ec9057e9e7ebba47f8cabdf91017edd6e3"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Ulj0wc2EBV9B/My53VaDXmQkSkbmpXhXeazZoyYNsg8kBk2ypggQ67UPhV6vK5IP3UfKgdMWhggwoT6jxTHHDQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-08T08:34:20.016550Z","bundle_sha256":"e233e4e0fb817e883e6a65ba141e5062b4e763bae3f73e73eddd70d87189c39d"}}