{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2024:XAEDB676XALVLAE77CV2DVESO3","short_pith_number":"pith:XAEDB676","canonical_record":{"source":{"id":"2412.14898","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2024-12-19T14:28:04Z","cross_cats_sorted":[],"title_canon_sha256":"67304e77d71bfa7897048cf52460611a5ac12562562e2ee7332695f36ba0d849","abstract_canon_sha256":"c24b427719f9393159b28b59b4522f9aae8f6ed970f104f00f7d0b59d5e2fd5b"},"schema_version":"1.0"},"canonical_sha256":"b80830fbfeb81755809ff8aba1d49276cf442efbf66e4bcb149b757842109857","source":{"kind":"arxiv","id":"2412.14898","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2412.14898","created_at":"2026-07-05T10:16:18Z"},{"alias_kind":"arxiv_version","alias_value":"2412.14898v2","created_at":"2026-07-05T10:16:18Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2412.14898","created_at":"2026-07-05T10:16:18Z"},{"alias_kind":"pith_short_12","alias_value":"XAEDB676XALV","created_at":"2026-07-05T10:16:18Z"},{"alias_kind":"pith_short_16","alias_value":"XAEDB676XALVLAE7","created_at":"2026-07-05T10:16:18Z"},{"alias_kind":"pith_short_8","alias_value":"XAEDB676","created_at":"2026-07-05T10:16:18Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2024:XAEDB676XALVLAE77CV2DVESO3","target":"record","payload":{"canonical_record":{"source":{"id":"2412.14898","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2024-12-19T14:28:04Z","cross_cats_sorted":[],"title_canon_sha256":"67304e77d71bfa7897048cf52460611a5ac12562562e2ee7332695f36ba0d849","abstract_canon_sha256":"c24b427719f9393159b28b59b4522f9aae8f6ed970f104f00f7d0b59d5e2fd5b"},"schema_version":"1.0"},"canonical_sha256":"b80830fbfeb81755809ff8aba1d49276cf442efbf66e4bcb149b757842109857","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T10:16:18.435945Z","signature_b64":"SONyoAeVuO8bSj201/exd3xB01R7VCclPEZQ9GylnVLHsAax5vz3bPFsw1KLCWBlWtlSO8Xl4yqkH4tACUMICQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b80830fbfeb81755809ff8aba1d49276cf442efbf66e4bcb149b757842109857","last_reissued_at":"2026-07-05T10:16:18.435393Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T10:16:18.435393Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2412.14898","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":"2026-07-05T10:16:18Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ISAlePQ0PlzXKIztXz1RkK53V56rpaUPFyIgZdNENAibqtOQUp44B0Wi+FWolVgENe8wqlIXxVFqOlMkcFpjAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-20T12:47:00.977303Z"},"content_sha256":"81512b8f4956ee7ef39ce0b284aba602a142a59c7ec0caab58bc9e5ce5c5ca81","schema_version":"1.0","event_id":"sha256:81512b8f4956ee7ef39ce0b284aba602a142a59c7ec0caab58bc9e5ce5c5ca81"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2024:XAEDB676XALVLAE77CV2DVESO3","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Quantum thermometry for ultralow temperatures using probe and ancilla qubit chains","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Asghar Ullah, \\\"Ozg\\\"ur E. M\\\"ustecapl{\\i}o\\u{g}lu, Vipul Upadhyay","submitted_at":"2024-12-19T14:28:04Z","abstract_excerpt":"We propose a scheme to enhance the range and precision of ultralow temperature measurements by employing a probe qubit coupled to a chain of ancilla qubits. Specifically, we analyze a qubit chain governed by Heisenberg $XX$ and Dzyaloshinskii-Moriya (DM) interactions. The precision limits of temperature measurements are characterized through the evaluation of quantum Fisher information (QFI). Our findings demonstrate that the achievable precision bounds, as well as the number of peaks in the QFI as a function of temperature, can be controlled by adjusting the number of ancilla qubits and the s"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2412.14898","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/2412.14898/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":"2026-07-05T10:16:18Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"SxM89+r+DGDGkJI4TUNHVSHLUNPY2ka8lrfOJPdVIdhlyfs2iAH6TvqieRPczeR4i6uKiWOodQwh2jxBq6PdCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-20T12:47:00.978089Z"},"content_sha256":"5661731530678905d121020fca1b1f561d427ae9b0651b0cefac1943ac3e7c0e","schema_version":"1.0","event_id":"sha256:5661731530678905d121020fca1b1f561d427ae9b0651b0cefac1943ac3e7c0e"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/XAEDB676XALVLAE77CV2DVESO3/bundle.json","state_url":"https://pith.science/pith/XAEDB676XALVLAE77CV2DVESO3/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/XAEDB676XALVLAE77CV2DVESO3/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":"2026-08-20T12:47:00Z","links":{"resolver":"https://pith.science/pith/XAEDB676XALVLAE77CV2DVESO3","bundle":"https://pith.science/pith/XAEDB676XALVLAE77CV2DVESO3/bundle.json","state":"https://pith.science/pith/XAEDB676XALVLAE77CV2DVESO3/state.json","well_known_bundle":"https://pith.science/.well-known/pith/XAEDB676XALVLAE77CV2DVESO3/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2024:XAEDB676XALVLAE77CV2DVESO3","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":"c24b427719f9393159b28b59b4522f9aae8f6ed970f104f00f7d0b59d5e2fd5b","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2024-12-19T14:28:04Z","title_canon_sha256":"67304e77d71bfa7897048cf52460611a5ac12562562e2ee7332695f36ba0d849"},"schema_version":"1.0","source":{"id":"2412.14898","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2412.14898","created_at":"2026-07-05T10:16:18Z"},{"alias_kind":"arxiv_version","alias_value":"2412.14898v2","created_at":"2026-07-05T10:16:18Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2412.14898","created_at":"2026-07-05T10:16:18Z"},{"alias_kind":"pith_short_12","alias_value":"XAEDB676XALV","created_at":"2026-07-05T10:16:18Z"},{"alias_kind":"pith_short_16","alias_value":"XAEDB676XALVLAE7","created_at":"2026-07-05T10:16:18Z"},{"alias_kind":"pith_short_8","alias_value":"XAEDB676","created_at":"2026-07-05T10:16:18Z"}],"graph_snapshots":[{"event_id":"sha256:5661731530678905d121020fca1b1f561d427ae9b0651b0cefac1943ac3e7c0e","target":"graph","created_at":"2026-07-05T10:16:18Z","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/2412.14898/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We propose a scheme to enhance the range and precision of ultralow temperature measurements by employing a probe qubit coupled to a chain of ancilla qubits. Specifically, we analyze a qubit chain governed by Heisenberg $XX$ and Dzyaloshinskii-Moriya (DM) interactions. The precision limits of temperature measurements are characterized through the evaluation of quantum Fisher information (QFI). Our findings demonstrate that the achievable precision bounds, as well as the number of peaks in the QFI as a function of temperature, can be controlled by adjusting the number of ancilla qubits and the s","authors_text":"Asghar Ullah, \\\"Ozg\\\"ur E. M\\\"ustecapl{\\i}o\\u{g}lu, Vipul Upadhyay","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2024-12-19T14:28:04Z","title":"Quantum thermometry for ultralow temperatures using probe and ancilla qubit chains"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2412.14898","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":"sha256:81512b8f4956ee7ef39ce0b284aba602a142a59c7ec0caab58bc9e5ce5c5ca81","target":"record","created_at":"2026-07-05T10:16:18Z","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":"c24b427719f9393159b28b59b4522f9aae8f6ed970f104f00f7d0b59d5e2fd5b","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2024-12-19T14:28:04Z","title_canon_sha256":"67304e77d71bfa7897048cf52460611a5ac12562562e2ee7332695f36ba0d849"},"schema_version":"1.0","source":{"id":"2412.14898","kind":"arxiv","version":2}},"canonical_sha256":"b80830fbfeb81755809ff8aba1d49276cf442efbf66e4bcb149b757842109857","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b80830fbfeb81755809ff8aba1d49276cf442efbf66e4bcb149b757842109857","first_computed_at":"2026-07-05T10:16:18.435393Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T10:16:18.435393Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"SONyoAeVuO8bSj201/exd3xB01R7VCclPEZQ9GylnVLHsAax5vz3bPFsw1KLCWBlWtlSO8Xl4yqkH4tACUMICQ==","signature_status":"signed_v1","signed_at":"2026-07-05T10:16:18.435945Z","signed_message":"canonical_sha256_bytes"},"source_id":"2412.14898","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:81512b8f4956ee7ef39ce0b284aba602a142a59c7ec0caab58bc9e5ce5c5ca81","sha256:5661731530678905d121020fca1b1f561d427ae9b0651b0cefac1943ac3e7c0e"],"state_sha256":"6c0f2faed9cc2504fb55be1c9ab2fe278aa0435e40fbbb7b36634f8d2aa40585"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Ue1iu4qsf+r7p0VYigqvMxdndiP9izhRWVHqKlIs+Ja+fk9vFcZehWBBiS7crRzdYDBvr7fhgYiBAXy/Yim/AQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-20T12:47:00.983805Z","bundle_sha256":"ae10920a689d04951802cf20c9fbc4241754327a00849c3a24aa1e3fff16d2d1"}}