{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2025:BHMKQYKDIQ6O4ZQWEJUB3P5OWL","short_pith_number":"pith:BHMKQYKD","canonical_record":{"source":{"id":"2503.17362","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2025-03-21T17:59:48Z","cross_cats_sorted":[],"title_canon_sha256":"ea5deafa372aaa82a74eea3df4cb26f833fa71b3077e7ef27abac91e2fd20bd8","abstract_canon_sha256":"02fe7fb6156283696403a80a0995ee451030a8e2525adeafcc2514f6a0c59a37"},"schema_version":"1.0"},"canonical_sha256":"09d8a86143443cee661622681dbfaeb2cd8b2d6aca523e3a6e051b5c5cccc5d2","source":{"kind":"arxiv","id":"2503.17362","version":3},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2503.17362","created_at":"2026-07-31T01:08:21Z"},{"alias_kind":"arxiv_version","alias_value":"2503.17362v3","created_at":"2026-07-31T01:08:21Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2503.17362","created_at":"2026-07-31T01:08:21Z"},{"alias_kind":"pith_short_12","alias_value":"BHMKQYKDIQ6O","created_at":"2026-07-31T01:08:21Z"},{"alias_kind":"pith_short_16","alias_value":"BHMKQYKDIQ6O4ZQW","created_at":"2026-07-31T01:08:21Z"},{"alias_kind":"pith_short_8","alias_value":"BHMKQYKD","created_at":"2026-07-31T01:08:21Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2025:BHMKQYKDIQ6O4ZQWEJUB3P5OWL","target":"record","payload":{"canonical_record":{"source":{"id":"2503.17362","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2025-03-21T17:59:48Z","cross_cats_sorted":[],"title_canon_sha256":"ea5deafa372aaa82a74eea3df4cb26f833fa71b3077e7ef27abac91e2fd20bd8","abstract_canon_sha256":"02fe7fb6156283696403a80a0995ee451030a8e2525adeafcc2514f6a0c59a37"},"schema_version":"1.0"},"canonical_sha256":"09d8a86143443cee661622681dbfaeb2cd8b2d6aca523e3a6e051b5c5cccc5d2","receipt":{"kind":"pith_receipt","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"09d8a86143443cee661622681dbfaeb2cd8b2d6aca523e3a6e051b5c5cccc5d2","last_reissued_at":"2026-07-31T01:08:21.644428Z","signature_status":"unsigned_v0","first_computed_at":"2026-07-31T01:08:21.644428Z"},"source_kind":"arxiv","source_id":"2503.17362","source_version":3,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-31T01:08:21Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"mCjauFZFMROiqD9M1HVH4YOITaSwSZ8qVS2t+Qi3V2K544AopjD1BQ3NuEojyg7Jy7Xhb76msftNAD0yZWA0Cw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-10T19:13:55.343270Z"},"content_sha256":"6baf34e68dba99d0bfe9f758afb24d3951d2e5d13569a1b8ecd076be6fb080e0","schema_version":"1.0","event_id":"sha256:6baf34e68dba99d0bfe9f758afb24d3951d2e5d13569a1b8ecd076be6fb080e0"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2025:BHMKQYKDIQ6O4ZQWEJUB3P5OWL","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Criteria for unbiased estimation: applications to noise-agnostic sensing and quantum channel estimation","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Chia-Tung Chu, Hyukgun Kwon, Kento Tsubouchi, Liang Jiang","submitted_at":"2025-03-21T17:59:48Z","abstract_excerpt":"We establish the necessary and sufficient conditions for {local} unbiased estimation in multi-parameter estimation tasks. More specifically, we first consider quantum state estimation, where multiple parameters are encoded in a quantum state, and derive simple and intuitive necessary and sufficient conditions for a {local} unbiased estimation based on the derivatives of the encoded state. To demonstrate the utility of our framework, we consider phase estimation under unknown Pauli noise. We show that while {local} unbiased phase estimation is infeasible with a naive scheme, employing an entang"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2503.17362","kind":"arxiv","version":3},"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/2503.17362/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":"2026-07-31T01:08:21Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"oUUa9t/nIsmi5xv36FLCvLbsINj/yW5FMd/s1HRlRu0iKeMSCOBNYMM79Tm/PxEkfJw4eD2KEneHjzh+deRdCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-10T19:13:55.344208Z"},"content_sha256":"483deacb885372db9e1f477774fa45ce3e8039f6c2c2d4c8008c1a00f31f2375","schema_version":"1.0","event_id":"sha256:483deacb885372db9e1f477774fa45ce3e8039f6c2c2d4c8008c1a00f31f2375"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/BHMKQYKDIQ6O4ZQWEJUB3P5OWL/bundle.json","state_url":"https://pith.science/pith/BHMKQYKDIQ6O4ZQWEJUB3P5OWL/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/BHMKQYKDIQ6O4ZQWEJUB3P5OWL/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":"2026-08-10T19:13:55Z","links":{"resolver":"https://pith.science/pith/BHMKQYKDIQ6O4ZQWEJUB3P5OWL","bundle":"https://pith.science/pith/BHMKQYKDIQ6O4ZQWEJUB3P5OWL/bundle.json","state":"https://pith.science/pith/BHMKQYKDIQ6O4ZQWEJUB3P5OWL/state.json","well_known_bundle":"https://pith.science/.well-known/pith/BHMKQYKDIQ6O4ZQWEJUB3P5OWL/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:BHMKQYKDIQ6O4ZQWEJUB3P5OWL","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":"02fe7fb6156283696403a80a0995ee451030a8e2525adeafcc2514f6a0c59a37","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2025-03-21T17:59:48Z","title_canon_sha256":"ea5deafa372aaa82a74eea3df4cb26f833fa71b3077e7ef27abac91e2fd20bd8"},"schema_version":"1.0","source":{"id":"2503.17362","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2503.17362","created_at":"2026-07-31T01:08:21Z"},{"alias_kind":"arxiv_version","alias_value":"2503.17362v3","created_at":"2026-07-31T01:08:21Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2503.17362","created_at":"2026-07-31T01:08:21Z"},{"alias_kind":"pith_short_12","alias_value":"BHMKQYKDIQ6O","created_at":"2026-07-31T01:08:21Z"},{"alias_kind":"pith_short_16","alias_value":"BHMKQYKDIQ6O4ZQW","created_at":"2026-07-31T01:08:21Z"},{"alias_kind":"pith_short_8","alias_value":"BHMKQYKD","created_at":"2026-07-31T01:08:21Z"}],"graph_snapshots":[{"event_id":"sha256:483deacb885372db9e1f477774fa45ce3e8039f6c2c2d4c8008c1a00f31f2375","target":"graph","created_at":"2026-07-31T01:08:21Z","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/2503.17362/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We establish the necessary and sufficient conditions for {local} unbiased estimation in multi-parameter estimation tasks. More specifically, we first consider quantum state estimation, where multiple parameters are encoded in a quantum state, and derive simple and intuitive necessary and sufficient conditions for a {local} unbiased estimation based on the derivatives of the encoded state. To demonstrate the utility of our framework, we consider phase estimation under unknown Pauli noise. We show that while {local} unbiased phase estimation is infeasible with a naive scheme, employing an entang","authors_text":"Chia-Tung Chu, Hyukgun Kwon, Kento Tsubouchi, Liang Jiang","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2025-03-21T17:59:48Z","title":"Criteria for unbiased estimation: applications to noise-agnostic sensing and quantum channel estimation"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2503.17362","kind":"arxiv","version":3},"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":"sha256:6baf34e68dba99d0bfe9f758afb24d3951d2e5d13569a1b8ecd076be6fb080e0","target":"record","created_at":"2026-07-31T01:08:21Z","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":"02fe7fb6156283696403a80a0995ee451030a8e2525adeafcc2514f6a0c59a37","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2025-03-21T17:59:48Z","title_canon_sha256":"ea5deafa372aaa82a74eea3df4cb26f833fa71b3077e7ef27abac91e2fd20bd8"},"schema_version":"1.0","source":{"id":"2503.17362","kind":"arxiv","version":3}},"canonical_sha256":"09d8a86143443cee661622681dbfaeb2cd8b2d6aca523e3a6e051b5c5cccc5d2","receipt":{"builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"09d8a86143443cee661622681dbfaeb2cd8b2d6aca523e3a6e051b5c5cccc5d2","first_computed_at":"2026-07-31T01:08:21.644428Z","kind":"pith_receipt","last_reissued_at":"2026-07-31T01:08:21.644428Z","receipt_version":"0.3","signature_status":"unsigned_v0"},"source_id":"2503.17362","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:6baf34e68dba99d0bfe9f758afb24d3951d2e5d13569a1b8ecd076be6fb080e0","sha256:483deacb885372db9e1f477774fa45ce3e8039f6c2c2d4c8008c1a00f31f2375"],"state_sha256":"9b4c7a0242789f32e7041352c4dbf0e8d7ee284f7f47583fecd157c4eaa43f08"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"1rEdISx9xtQnY5CoKYCHKihehiSkiXN24b5FHAivNsvI0/qHGljbUpY3sq2izK6RL/AYW2xoFQnzhGmKEJZyCQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-10T19:13:55.348997Z","bundle_sha256":"c4833a48496a641a5734ba02f023ed4e7ef29edbbae92c310b2c28c66f7585c1"}}