{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:55AIOOGKTM56ZOR6WG4QMH6E4U","short_pith_number":"pith:55AIOOGK","canonical_record":{"source":{"id":"1611.00533","kind":"arxiv","version":4},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2016-11-02T10:20:30Z","cross_cats_sorted":[],"title_canon_sha256":"18809a6d7a45cd56ffb13f4bd59d5a8c486ff63626ff1c0bdddab2d885f17432","abstract_canon_sha256":"ff5deab761d757d2788419a9cdc6e78181d17ceda8c85c6604eaf98ffdb0ed68"},"schema_version":"1.0"},"canonical_sha256":"ef408738ca9b3becba3eb1b9061fc4e518a4c23df96ab15ac5325e73ec913d97","source":{"kind":"arxiv","id":"1611.00533","version":4},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1611.00533","created_at":"2026-05-18T00:45:19Z"},{"alias_kind":"arxiv_version","alias_value":"1611.00533v4","created_at":"2026-05-18T00:45:19Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1611.00533","created_at":"2026-05-18T00:45:19Z"},{"alias_kind":"pith_short_12","alias_value":"55AIOOGKTM56","created_at":"2026-05-18T12:29:58Z"},{"alias_kind":"pith_short_16","alias_value":"55AIOOGKTM56ZOR6","created_at":"2026-05-18T12:29:58Z"},{"alias_kind":"pith_short_8","alias_value":"55AIOOGK","created_at":"2026-05-18T12:29:58Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:55AIOOGKTM56ZOR6WG4QMH6E4U","target":"record","payload":{"canonical_record":{"source":{"id":"1611.00533","kind":"arxiv","version":4},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2016-11-02T10:20:30Z","cross_cats_sorted":[],"title_canon_sha256":"18809a6d7a45cd56ffb13f4bd59d5a8c486ff63626ff1c0bdddab2d885f17432","abstract_canon_sha256":"ff5deab761d757d2788419a9cdc6e78181d17ceda8c85c6604eaf98ffdb0ed68"},"schema_version":"1.0"},"canonical_sha256":"ef408738ca9b3becba3eb1b9061fc4e518a4c23df96ab15ac5325e73ec913d97","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:45:19.840847Z","signature_b64":"umtn754tw2JdfbBBJnEwCNdt4GRY7mqQgklrqdcTAYO+X8AAHoG7xa4EnDmTxNHDh58WrLr7cyIEFgCcheKODQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ef408738ca9b3becba3eb1b9061fc4e518a4c23df96ab15ac5325e73ec913d97","last_reissued_at":"2026-05-18T00:45:19.840157Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:45:19.840157Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1611.00533","source_version":4,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:45:19Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"LfJAbVE8c4lrbwMoeZhJdGhK+DouHqVP9zntlGmQMuTBpLh2E5xEhx11RJ8wxajeaVwsGaabJgBbjlX6na9uCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-04T06:48:17.155559Z"},"content_sha256":"13f00d9dd73fe6829ba27de453e77a645bfee54854e5ecb93c0e2d8bd699ac3c","schema_version":"1.0","event_id":"sha256:13f00d9dd73fe6829ba27de453e77a645bfee54854e5ecb93c0e2d8bd699ac3c"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:55AIOOGKTM56ZOR6WG4QMH6E4U","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Quantum Fisher Information as a Predictor of Decoherence in the Preparation of Spin-Cat States for Quantum Metrology","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Samuel P. Nolan, Simon A. Haine","submitted_at":"2016-11-02T10:20:30Z","abstract_excerpt":"In its simplest form, decoherence occurs when a quantum state is entangled with a second state, but the results of measurements made on the second state are not accessible. As the second state has effectively \"measured\" the first, in this paper we argue that the quantum Fisher information is the relevant metric for predicting and quantifying this kind of decoherence. The quantum Fisher information is usually used to determine an upper bound on how precisely measurements on a state can be used to estimate a classical parameter, and as such it is an important resource. Quantum enhanced metrology"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1611.00533","kind":"arxiv","version":4},"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":"2026-05-18T00:45:19Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+ES4m7rZFyx1zp5Rsm7ukNTkvU1GX7QhD4NeNSh9KKY7nVoMUaLZEp7Dv75GBKZ7DPWnBeHuUi4KeVSXB8OzCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-04T06:48:17.156197Z"},"content_sha256":"59fac15ad1ca04384d5ad9e876337d0466fd3d411685f7da947e1db9c7a469a8","schema_version":"1.0","event_id":"sha256:59fac15ad1ca04384d5ad9e876337d0466fd3d411685f7da947e1db9c7a469a8"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/55AIOOGKTM56ZOR6WG4QMH6E4U/bundle.json","state_url":"https://pith.science/pith/55AIOOGKTM56ZOR6WG4QMH6E4U/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/55AIOOGKTM56ZOR6WG4QMH6E4U/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":"2026-06-04T06:48:17Z","links":{"resolver":"https://pith.science/pith/55AIOOGKTM56ZOR6WG4QMH6E4U","bundle":"https://pith.science/pith/55AIOOGKTM56ZOR6WG4QMH6E4U/bundle.json","state":"https://pith.science/pith/55AIOOGKTM56ZOR6WG4QMH6E4U/state.json","well_known_bundle":"https://pith.science/.well-known/pith/55AIOOGKTM56ZOR6WG4QMH6E4U/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:55AIOOGKTM56ZOR6WG4QMH6E4U","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":"ff5deab761d757d2788419a9cdc6e78181d17ceda8c85c6604eaf98ffdb0ed68","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2016-11-02T10:20:30Z","title_canon_sha256":"18809a6d7a45cd56ffb13f4bd59d5a8c486ff63626ff1c0bdddab2d885f17432"},"schema_version":"1.0","source":{"id":"1611.00533","kind":"arxiv","version":4}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1611.00533","created_at":"2026-05-18T00:45:19Z"},{"alias_kind":"arxiv_version","alias_value":"1611.00533v4","created_at":"2026-05-18T00:45:19Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1611.00533","created_at":"2026-05-18T00:45:19Z"},{"alias_kind":"pith_short_12","alias_value":"55AIOOGKTM56","created_at":"2026-05-18T12:29:58Z"},{"alias_kind":"pith_short_16","alias_value":"55AIOOGKTM56ZOR6","created_at":"2026-05-18T12:29:58Z"},{"alias_kind":"pith_short_8","alias_value":"55AIOOGK","created_at":"2026-05-18T12:29:58Z"}],"graph_snapshots":[{"event_id":"sha256:59fac15ad1ca04384d5ad9e876337d0466fd3d411685f7da947e1db9c7a469a8","target":"graph","created_at":"2026-05-18T00:45:19Z","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":"In its simplest form, decoherence occurs when a quantum state is entangled with a second state, but the results of measurements made on the second state are not accessible. As the second state has effectively \"measured\" the first, in this paper we argue that the quantum Fisher information is the relevant metric for predicting and quantifying this kind of decoherence. The quantum Fisher information is usually used to determine an upper bound on how precisely measurements on a state can be used to estimate a classical parameter, and as such it is an important resource. Quantum enhanced metrology","authors_text":"Samuel P. Nolan, Simon A. Haine","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2016-11-02T10:20:30Z","title":"Quantum Fisher Information as a Predictor of Decoherence in the Preparation of Spin-Cat States for Quantum Metrology"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1611.00533","kind":"arxiv","version":4},"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":"sha256:13f00d9dd73fe6829ba27de453e77a645bfee54854e5ecb93c0e2d8bd699ac3c","target":"record","created_at":"2026-05-18T00:45:19Z","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":"ff5deab761d757d2788419a9cdc6e78181d17ceda8c85c6604eaf98ffdb0ed68","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2016-11-02T10:20:30Z","title_canon_sha256":"18809a6d7a45cd56ffb13f4bd59d5a8c486ff63626ff1c0bdddab2d885f17432"},"schema_version":"1.0","source":{"id":"1611.00533","kind":"arxiv","version":4}},"canonical_sha256":"ef408738ca9b3becba3eb1b9061fc4e518a4c23df96ab15ac5325e73ec913d97","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ef408738ca9b3becba3eb1b9061fc4e518a4c23df96ab15ac5325e73ec913d97","first_computed_at":"2026-05-18T00:45:19.840157Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:45:19.840157Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"umtn754tw2JdfbBBJnEwCNdt4GRY7mqQgklrqdcTAYO+X8AAHoG7xa4EnDmTxNHDh58WrLr7cyIEFgCcheKODQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:45:19.840847Z","signed_message":"canonical_sha256_bytes"},"source_id":"1611.00533","source_kind":"arxiv","source_version":4}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:13f00d9dd73fe6829ba27de453e77a645bfee54854e5ecb93c0e2d8bd699ac3c","sha256:59fac15ad1ca04384d5ad9e876337d0466fd3d411685f7da947e1db9c7a469a8"],"state_sha256":"74f6ccf856c32f423269206dc887a7c20d572ca75df4ec400ab1debe9f6397b3"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Z1xAc+i2Sltpkj6ASPJFApUfSyy2RNBL+3bplQUPWgvCVEFQwMLiuWEqyOc4b5N08qJ8esdCdZ+kvmjLolhTCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-04T06:48:17.159866Z","bundle_sha256":"d85ebc0e49a5dabbd5674bb04c9c3ee510a3089d21999fbea02c4d2908ab5712"}}