{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2000:P3447DUAM4LJUBQRD37UYHZ6VQ","short_pith_number":"pith:P3447DUA","canonical_record":{"source":{"id":"quant-ph/0008131","kind":"arxiv","version":2},"metadata":{"license":"","primary_cat":"quant-ph","submitted_at":"2000-08-30T18:48:22Z","cross_cats_sorted":[],"title_canon_sha256":"4d565c1e887551b8408d55b2343802946fb74147a26d6f31b7829a4a31730dae","abstract_canon_sha256":"bbaf33ed8199e2575b23627d5b93fc8ecc69314415b9b6b61c704147d86a566d"},"schema_version":"1.0"},"canonical_sha256":"7ef9cf8e8067169a06111eff4c1f3eac148fde14fce72edf81fd8782157d6909","source":{"kind":"arxiv","id":"quant-ph/0008131","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"quant-ph/0008131","created_at":"2026-05-18T01:05:06Z"},{"alias_kind":"arxiv_version","alias_value":"quant-ph/0008131v2","created_at":"2026-05-18T01:05:06Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.quant-ph/0008131","created_at":"2026-05-18T01:05:06Z"},{"alias_kind":"pith_short_12","alias_value":"P3447DUAM4LJ","created_at":"2026-05-18T12:25:50Z"},{"alias_kind":"pith_short_16","alias_value":"P3447DUAM4LJUBQR","created_at":"2026-05-18T12:25:50Z"},{"alias_kind":"pith_short_8","alias_value":"P3447DUA","created_at":"2026-05-18T12:25:50Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2000:P3447DUAM4LJUBQRD37UYHZ6VQ","target":"record","payload":{"canonical_record":{"source":{"id":"quant-ph/0008131","kind":"arxiv","version":2},"metadata":{"license":"","primary_cat":"quant-ph","submitted_at":"2000-08-30T18:48:22Z","cross_cats_sorted":[],"title_canon_sha256":"4d565c1e887551b8408d55b2343802946fb74147a26d6f31b7829a4a31730dae","abstract_canon_sha256":"bbaf33ed8199e2575b23627d5b93fc8ecc69314415b9b6b61c704147d86a566d"},"schema_version":"1.0"},"canonical_sha256":"7ef9cf8e8067169a06111eff4c1f3eac148fde14fce72edf81fd8782157d6909","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:05:06.781473Z","signature_b64":"tZ+aEP2O3b6Z9WJTycKbxvJqWSeBoMEFIeS/amW3VRQDOiJinXe+weqcWENT433xxh5ckunxWtEl/iHBAGHpBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"7ef9cf8e8067169a06111eff4c1f3eac148fde14fce72edf81fd8782157d6909","last_reissued_at":"2026-05-18T01:05:06.780956Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:05:06.780956Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"quant-ph/0008131","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":"2026-05-18T01:05:06Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ccpg2GMsVLCwGlc4GTddQ78Z2A6jCKZiuqxm8zF9G08Ap0RkyboOV6f/HOyK6GbhlkYGOAps9ckwThgzxsByDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T12:23:35.543931Z"},"content_sha256":"1c1023d0025bfce309b7498d012d20ea9d614ac7b9ff9b370c1ffae96a4a74f9","schema_version":"1.0","event_id":"sha256:1c1023d0025bfce309b7498d012d20ea9d614ac7b9ff9b370c1ffae96a4a74f9"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2000:P3447DUAM4LJUBQRD37UYHZ6VQ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Decoherence within a single atom","license":"","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Budapest), Gyula Bene, Szabolcs Borsanyi (Eotvos University","submitted_at":"2000-08-30T18:48:22Z","abstract_excerpt":"An \"almost diagonal\" reduced density matrix (in coordinate representation) is usually a result of environment induced decoherence and is considered the sign of classical behavior. We point out that the proton of a ground state hydrogen atom can possess such a density matrix. We demonstrate on this example that an \"almost diagonal\" reduced density matrix may derive from an interaction with a low number of degrees of freedom (in our case with a single electron) which play the role of the environment. We also show that decoherence effects in our example can only be observed if the interaction wit"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"quant-ph/0008131","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":"2026-05-18T01:05:06Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+AWHwTVYdeI/Nvmoh6ogSGS5B75L1jIUxgTACL7ZhOTwIbGYvCGv1RbbwM/l/G2Z9uWEw22+7mcIA6aWwm+NBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T12:23:35.544268Z"},"content_sha256":"1d0ff48c963109bd61171906a43c671c9df7a1030a8f5ff036416d6d90bf1af8","schema_version":"1.0","event_id":"sha256:1d0ff48c963109bd61171906a43c671c9df7a1030a8f5ff036416d6d90bf1af8"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/P3447DUAM4LJUBQRD37UYHZ6VQ/bundle.json","state_url":"https://pith.science/pith/P3447DUAM4LJUBQRD37UYHZ6VQ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/P3447DUAM4LJUBQRD37UYHZ6VQ/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":"2026-06-02T12:23:35Z","links":{"resolver":"https://pith.science/pith/P3447DUAM4LJUBQRD37UYHZ6VQ","bundle":"https://pith.science/pith/P3447DUAM4LJUBQRD37UYHZ6VQ/bundle.json","state":"https://pith.science/pith/P3447DUAM4LJUBQRD37UYHZ6VQ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/P3447DUAM4LJUBQRD37UYHZ6VQ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2000:P3447DUAM4LJUBQRD37UYHZ6VQ","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":"bbaf33ed8199e2575b23627d5b93fc8ecc69314415b9b6b61c704147d86a566d","cross_cats_sorted":[],"license":"","primary_cat":"quant-ph","submitted_at":"2000-08-30T18:48:22Z","title_canon_sha256":"4d565c1e887551b8408d55b2343802946fb74147a26d6f31b7829a4a31730dae"},"schema_version":"1.0","source":{"id":"quant-ph/0008131","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"quant-ph/0008131","created_at":"2026-05-18T01:05:06Z"},{"alias_kind":"arxiv_version","alias_value":"quant-ph/0008131v2","created_at":"2026-05-18T01:05:06Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.quant-ph/0008131","created_at":"2026-05-18T01:05:06Z"},{"alias_kind":"pith_short_12","alias_value":"P3447DUAM4LJ","created_at":"2026-05-18T12:25:50Z"},{"alias_kind":"pith_short_16","alias_value":"P3447DUAM4LJUBQR","created_at":"2026-05-18T12:25:50Z"},{"alias_kind":"pith_short_8","alias_value":"P3447DUA","created_at":"2026-05-18T12:25:50Z"}],"graph_snapshots":[{"event_id":"sha256:1d0ff48c963109bd61171906a43c671c9df7a1030a8f5ff036416d6d90bf1af8","target":"graph","created_at":"2026-05-18T01:05:06Z","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":"An \"almost diagonal\" reduced density matrix (in coordinate representation) is usually a result of environment induced decoherence and is considered the sign of classical behavior. We point out that the proton of a ground state hydrogen atom can possess such a density matrix. We demonstrate on this example that an \"almost diagonal\" reduced density matrix may derive from an interaction with a low number of degrees of freedom (in our case with a single electron) which play the role of the environment. We also show that decoherence effects in our example can only be observed if the interaction wit","authors_text":"Budapest), Gyula Bene, Szabolcs Borsanyi (Eotvos University","cross_cats":[],"headline":"","license":"","primary_cat":"quant-ph","submitted_at":"2000-08-30T18:48:22Z","title":"Decoherence within a single atom"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"quant-ph/0008131","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":"sha256:1c1023d0025bfce309b7498d012d20ea9d614ac7b9ff9b370c1ffae96a4a74f9","target":"record","created_at":"2026-05-18T01:05:06Z","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":"bbaf33ed8199e2575b23627d5b93fc8ecc69314415b9b6b61c704147d86a566d","cross_cats_sorted":[],"license":"","primary_cat":"quant-ph","submitted_at":"2000-08-30T18:48:22Z","title_canon_sha256":"4d565c1e887551b8408d55b2343802946fb74147a26d6f31b7829a4a31730dae"},"schema_version":"1.0","source":{"id":"quant-ph/0008131","kind":"arxiv","version":2}},"canonical_sha256":"7ef9cf8e8067169a06111eff4c1f3eac148fde14fce72edf81fd8782157d6909","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"7ef9cf8e8067169a06111eff4c1f3eac148fde14fce72edf81fd8782157d6909","first_computed_at":"2026-05-18T01:05:06.780956Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:05:06.780956Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"tZ+aEP2O3b6Z9WJTycKbxvJqWSeBoMEFIeS/amW3VRQDOiJinXe+weqcWENT433xxh5ckunxWtEl/iHBAGHpBw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:05:06.781473Z","signed_message":"canonical_sha256_bytes"},"source_id":"quant-ph/0008131","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:1c1023d0025bfce309b7498d012d20ea9d614ac7b9ff9b370c1ffae96a4a74f9","sha256:1d0ff48c963109bd61171906a43c671c9df7a1030a8f5ff036416d6d90bf1af8"],"state_sha256":"23a4593d0c330f60d199497612cddbf0c3376fae0c2dbabbf0f9983eaa0ca0fb"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"pGX53tVYkl6QFPSlHiSsXhA6tf4qY0lEyN2Cz01gu/DwPAqSaE8aYFHlSgnp7NPrX9o0Ut2IfVbou9uoCuvnAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-02T12:23:35.546295Z","bundle_sha256":"da9090412135cedd7ec67bc3a3f98316b1ba19c579ecf1ac39350058885316db"}}