{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2014:VINROED3DPRLUDFVBBZ4ZE44H3","short_pith_number":"pith:VINROED3","canonical_record":{"source":{"id":"1402.0495","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2014-02-03T20:59:52Z","cross_cats_sorted":["math-ph","math.MP"],"title_canon_sha256":"2fa967dbc8afaadf63d26f471f93b3ec3cc93445b6e0fa3eca3ee9a785c94df7","abstract_canon_sha256":"ed6cda73b51607de052f159f4ef92f76a8f64612b28c664384b2453f8a6a4100"},"schema_version":"1.0"},"canonical_sha256":"aa1b17107b1be2ba0cb50873cc939c3ecf7875af24ea152207195f326abbd036","source":{"kind":"arxiv","id":"1402.0495","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1402.0495","created_at":"2026-05-18T03:00:15Z"},{"alias_kind":"arxiv_version","alias_value":"1402.0495v1","created_at":"2026-05-18T03:00:15Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1402.0495","created_at":"2026-05-18T03:00:15Z"},{"alias_kind":"pith_short_12","alias_value":"VINROED3DPRL","created_at":"2026-05-18T12:28:54Z"},{"alias_kind":"pith_short_16","alias_value":"VINROED3DPRLUDFV","created_at":"2026-05-18T12:28:54Z"},{"alias_kind":"pith_short_8","alias_value":"VINROED3","created_at":"2026-05-18T12:28:54Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2014:VINROED3DPRLUDFVBBZ4ZE44H3","target":"record","payload":{"canonical_record":{"source":{"id":"1402.0495","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2014-02-03T20:59:52Z","cross_cats_sorted":["math-ph","math.MP"],"title_canon_sha256":"2fa967dbc8afaadf63d26f471f93b3ec3cc93445b6e0fa3eca3ee9a785c94df7","abstract_canon_sha256":"ed6cda73b51607de052f159f4ef92f76a8f64612b28c664384b2453f8a6a4100"},"schema_version":"1.0"},"canonical_sha256":"aa1b17107b1be2ba0cb50873cc939c3ecf7875af24ea152207195f326abbd036","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:00:15.163535Z","signature_b64":"r4vUnNhjr7LQDfdR0LovvB5QKdNaCZ27XEdSAzdZ9irTG13m8iMVZcEETzEVr53fJQDOQhcqYf2XsVR+Vfo3Bg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"aa1b17107b1be2ba0cb50873cc939c3ecf7875af24ea152207195f326abbd036","last_reissued_at":"2026-05-18T03:00:15.162738Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:00:15.162738Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1402.0495","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":"2026-05-18T03:00:15Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"7L2Aif0oqWCpvg4DLpaf4t/sGO/P0R2YHlkHYat0MNNpLC1J1mlNk6slnHc0PxrlmXSMUrFSue6IwkL4X+GnCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-21T15:25:56.689082Z"},"content_sha256":"444da50c1bb6e23466a8004f82964c4cd88196192689d701c087d3530465b8ab","schema_version":"1.0","event_id":"sha256:444da50c1bb6e23466a8004f82964c4cd88196192689d701c087d3530465b8ab"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2014:VINROED3DPRLUDFVBBZ4ZE44H3","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"True Limits to Precision via Unique Quantum Probe","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["math-ph","math.MP"],"primary_cat":"quant-ph","authors_text":"Edward H. Chen, Gabriel A. Durkin, Sergey I. Knysh","submitted_at":"2014-02-03T20:59:52Z","abstract_excerpt":"Quantum instruments derived from composite systems allow greater measurement precision than their classical counterparts due to coherences maintained between N components; spins, atoms or photons. Decoherence that plagues real-world devices can be particle loss, or thermal excitation and relaxation, or dephasing due to external noise sources -- and also due to prior parameter uncertainty. All these adversely affect precision estimation of time, phase or frequency. We develop a novel technique uncovering the uniquely optimal probe states of the N `qubits' alongside new tight bounds on precision"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1402.0495","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":"2026-05-18T03:00:15Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"FLiaMdB+fNZWyej4HZQjN2Ipz1o0+bvjMMdEWcYe73Mui8D5PG62tkkEM0+kC2om0Z6HuidHHg9qvU8pxRZECA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-21T15:25:56.689791Z"},"content_sha256":"a2cad9dc03d6d6ca7add14743bc76962ee4a9fdb5df8d78fd5d0041c3fb751c5","schema_version":"1.0","event_id":"sha256:a2cad9dc03d6d6ca7add14743bc76962ee4a9fdb5df8d78fd5d0041c3fb751c5"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/VINROED3DPRLUDFVBBZ4ZE44H3/bundle.json","state_url":"https://pith.science/pith/VINROED3DPRLUDFVBBZ4ZE44H3/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/VINROED3DPRLUDFVBBZ4ZE44H3/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":"2026-05-21T15:25:56Z","links":{"resolver":"https://pith.science/pith/VINROED3DPRLUDFVBBZ4ZE44H3","bundle":"https://pith.science/pith/VINROED3DPRLUDFVBBZ4ZE44H3/bundle.json","state":"https://pith.science/pith/VINROED3DPRLUDFVBBZ4ZE44H3/state.json","well_known_bundle":"https://pith.science/.well-known/pith/VINROED3DPRLUDFVBBZ4ZE44H3/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:VINROED3DPRLUDFVBBZ4ZE44H3","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":"ed6cda73b51607de052f159f4ef92f76a8f64612b28c664384b2453f8a6a4100","cross_cats_sorted":["math-ph","math.MP"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2014-02-03T20:59:52Z","title_canon_sha256":"2fa967dbc8afaadf63d26f471f93b3ec3cc93445b6e0fa3eca3ee9a785c94df7"},"schema_version":"1.0","source":{"id":"1402.0495","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1402.0495","created_at":"2026-05-18T03:00:15Z"},{"alias_kind":"arxiv_version","alias_value":"1402.0495v1","created_at":"2026-05-18T03:00:15Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1402.0495","created_at":"2026-05-18T03:00:15Z"},{"alias_kind":"pith_short_12","alias_value":"VINROED3DPRL","created_at":"2026-05-18T12:28:54Z"},{"alias_kind":"pith_short_16","alias_value":"VINROED3DPRLUDFV","created_at":"2026-05-18T12:28:54Z"},{"alias_kind":"pith_short_8","alias_value":"VINROED3","created_at":"2026-05-18T12:28:54Z"}],"graph_snapshots":[{"event_id":"sha256:a2cad9dc03d6d6ca7add14743bc76962ee4a9fdb5df8d78fd5d0041c3fb751c5","target":"graph","created_at":"2026-05-18T03:00:15Z","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":"Quantum instruments derived from composite systems allow greater measurement precision than their classical counterparts due to coherences maintained between N components; spins, atoms or photons. Decoherence that plagues real-world devices can be particle loss, or thermal excitation and relaxation, or dephasing due to external noise sources -- and also due to prior parameter uncertainty. All these adversely affect precision estimation of time, phase or frequency. We develop a novel technique uncovering the uniquely optimal probe states of the N `qubits' alongside new tight bounds on precision","authors_text":"Edward H. Chen, Gabriel A. Durkin, Sergey I. Knysh","cross_cats":["math-ph","math.MP"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2014-02-03T20:59:52Z","title":"True Limits to Precision via Unique Quantum Probe"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1402.0495","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":"sha256:444da50c1bb6e23466a8004f82964c4cd88196192689d701c087d3530465b8ab","target":"record","created_at":"2026-05-18T03:00:15Z","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":"ed6cda73b51607de052f159f4ef92f76a8f64612b28c664384b2453f8a6a4100","cross_cats_sorted":["math-ph","math.MP"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2014-02-03T20:59:52Z","title_canon_sha256":"2fa967dbc8afaadf63d26f471f93b3ec3cc93445b6e0fa3eca3ee9a785c94df7"},"schema_version":"1.0","source":{"id":"1402.0495","kind":"arxiv","version":1}},"canonical_sha256":"aa1b17107b1be2ba0cb50873cc939c3ecf7875af24ea152207195f326abbd036","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"aa1b17107b1be2ba0cb50873cc939c3ecf7875af24ea152207195f326abbd036","first_computed_at":"2026-05-18T03:00:15.162738Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:00:15.162738Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"r4vUnNhjr7LQDfdR0LovvB5QKdNaCZ27XEdSAzdZ9irTG13m8iMVZcEETzEVr53fJQDOQhcqYf2XsVR+Vfo3Bg==","signature_status":"signed_v1","signed_at":"2026-05-18T03:00:15.163535Z","signed_message":"canonical_sha256_bytes"},"source_id":"1402.0495","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:444da50c1bb6e23466a8004f82964c4cd88196192689d701c087d3530465b8ab","sha256:a2cad9dc03d6d6ca7add14743bc76962ee4a9fdb5df8d78fd5d0041c3fb751c5"],"state_sha256":"62708253fdc63da2b3ed859e8126507f381ef937de9ca92ce72530f39bae957a"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"K+GFQqet7sHXMJ93Y+qCDZxRe5YvorxapWpoYPn//fLenQEyXnV2M+4Opyk59qETkqtAuc4I3Aui9LQ1sPbXDQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-21T15:25:56.692971Z","bundle_sha256":"59ac930b6cdc548c39f5de84f44078805a68e8f7ce1e505096da329c200cd4be"}}