{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2025:6NOCGDCYJWCZJZ5GDGTOJPFJQ2","short_pith_number":"pith:6NOCGDCY","schema_version":"1.0","canonical_sha256":"f35c230c584d8594e7a619a6e4bca986bed23cabeea2ab936fc3facbb9ef4c54","source":{"kind":"arxiv","id":"2507.03471","version":2},"attestation_state":"computed","paper":{"title":"Nonequilibrium thermometry via an ensemble of initially correlated qubits","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"Initial quantum correlations among qubits enhance the Quantum Fisher Information for bath temperature estimation during nonequilibrium thermalization.","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Enrico Trombetti, Marco Malitesta, Marco Pezzutto, Stefano Gherardini","submitted_at":"2025-07-04T10:49:39Z","abstract_excerpt":"We investigate a nonequilibrium quantum thermometry protocol in which an ensemble of qubits, acting as temperature probes, is weakly coupled to a macroscopic thermal bath. The temperature of the bath, the parameter of interest, is encoded in the dissipator of a Markovian thermalization process. For some relevant initial states, we observe a peak in the Quantum Fisher Information (QFI) during the transient of the thermalization, indicating enhanced sensitivity in early-time dynamics. This effect becomes more pronounced at higher bath temperatures and is further enhanced when the initial reduced"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":true,"formal_links_present":true},"canonical_record":{"source":{"id":"2507.03471","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2025-07-04T10:49:39Z","cross_cats_sorted":[],"title_canon_sha256":"a97bb4f3d8a41b85b814a9d1ab38107987f4aaac84b9f502a048e9b94d832488","abstract_canon_sha256":"64edecdb792a834efe52538af0179d41a7f6de5d95ec3aca0cb791cffb27d93a"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-06-10T01:09:19.530413Z","signature_b64":"YVI4xJk5lJTaLO5ZzHuBzcpwf6/qMxaKwl0PKJZ6TgGGGgj48N4T5TuhAgvhHJRJltEekrG+zQVT8vNk56lJBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"f35c230c584d8594e7a619a6e4bca986bed23cabeea2ab936fc3facbb9ef4c54","last_reissued_at":"2026-06-10T01:09:19.529514Z","signature_status":"signed_v1","first_computed_at":"2026-06-10T01:09:19.529514Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Nonequilibrium thermometry via an ensemble of initially correlated qubits","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"Initial quantum correlations among qubits enhance the Quantum Fisher Information for bath temperature estimation during nonequilibrium thermalization.","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Enrico Trombetti, Marco Malitesta, Marco Pezzutto, Stefano Gherardini","submitted_at":"2025-07-04T10:49:39Z","abstract_excerpt":"We investigate a nonequilibrium quantum thermometry protocol in which an ensemble of qubits, acting as temperature probes, is weakly coupled to a macroscopic thermal bath. The temperature of the bath, the parameter of interest, is encoded in the dissipator of a Markovian thermalization process. For some relevant initial states, we observe a peak in the Quantum Fisher Information (QFI) during the transient of the thermalization, indicating enhanced sensitivity in early-time dynamics. This effect becomes more pronounced at higher bath temperatures and is further enhanced when the initial reduced"},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"We find strong numerical evidence that, given same single-qubit reduced states, the inclusion of quantum correlations among the qubits of the ensemble always yields an enhanced QFI.","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"The qubits remain weakly coupled to a macroscopic thermal bath so that the reduced dynamics is accurately described by a Markovian master equation with a temperature-dependent dissipator (abstract and implied in the protocol description).","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"Initial quantum correlations among qubits enhance quantum Fisher information for temperature estimation in nonequilibrium Markovian thermalization, with early-time peaks and near-standard-quantum-limit performance for entangled states at high temperatures.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"},{"kind":"headline","text":"Initial quantum correlations among qubits enhance the Quantum Fisher Information for bath temperature estimation during nonequilibrium thermalization.","source":"verdict.pith_extraction.headline","status":"machine_extracted","claim_id":"C4","attestation":"unclaimed"}],"snapshot_sha256":"2e7394179a6fa075cafa73b444ae467c9cff9ffddb9be8b6327c6ad1228d1cdd"},"source":{"id":"2507.03471","kind":"arxiv","version":2},"verdict":{"id":"4805f912-5d76-439e-8c00-cf48500bc5e8","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-19T06:35:12.047113Z","strongest_claim":"We find strong numerical evidence that, given same single-qubit reduced states, the inclusion of quantum correlations among the qubits of the ensemble always yields an enhanced QFI.","one_line_summary":"Initial quantum correlations among qubits enhance quantum Fisher information for temperature estimation in nonequilibrium Markovian thermalization, with early-time peaks and near-standard-quantum-limit performance for entangled states at high temperatures.","pipeline_version":"pith-pipeline@v0.9.0","weakest_assumption":"The qubits remain weakly coupled to a macroscopic thermal bath so that the reduced dynamics is accurately described by a Markovian master equation with a temperature-dependent dissipator (abstract and implied in the protocol description).","pith_extraction_headline":"Initial quantum correlations among qubits enhance the Quantum Fisher Information for bath temperature estimation during nonequilibrium thermalization."},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2507.03471/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":55,"sample":[{"doi":"","year":null,"title":"Time-evolution of a multi-qubit state The nonequilibrium thermometry setting, which we are referring to, considers a model where the interaction be- tween each qubit thermometer and the thermal bath i","work_id":"555a1f2e-ba01-49e2-8868-5f22b780e138","ref_index":1,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2020,"title":"Quan- tum Reservoir Computing (QuReCo)","work_id":"ec6e44a8-5d3c-4194-8543-0f4ca09ac075","ref_index":2,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":null,"title":"ˆK1 = 1 2 ∂β q 0 0 q(1 − p) , ∂β( ˆK †","work_id":"f2606627-f6ff-46cd-84b7-7030e78b2c61","ref_index":3,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":null,"title":"ˆK2 = 1 2 ∂β 0 0 0 pq , ∂β( ˆK †","work_id":"84a8c1ae-1a1d-4d3a-b32a-226bb4ee35c4","ref_index":4,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":null,"title":"ˆK3 = 1 2 ∂β (1 − p)(1 − q) 0 0 −q , ∂β( ˆK †","work_id":"eecf2dae-402b-4cf9-9b93-ef19c243de04","ref_index":5,"cited_arxiv_id":"","is_internal_anchor":false}],"resolved_work":55,"snapshot_sha256":"2c8e2875486bb651f0385fe68b580ae67b18ad5c2629b6aa762a91b5d30fdc81","internal_anchors":0},"formal_canon":{"evidence_count":2,"snapshot_sha256":"829f9602daf371d9681e3e9286bbd57006b52579ef45d3cb09b3d55cc8a24ea0"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"aliases":[{"alias_kind":"arxiv","alias_value":"2507.03471","created_at":"2026-06-10T01:09:19.529641+00:00"},{"alias_kind":"arxiv_version","alias_value":"2507.03471v2","created_at":"2026-06-10T01:09:19.529641+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2507.03471","created_at":"2026-06-10T01:09:19.529641+00:00"},{"alias_kind":"pith_short_12","alias_value":"6NOCGDCYJWCZ","created_at":"2026-06-10T01:09:19.529641+00:00"},{"alias_kind":"pith_short_16","alias_value":"6NOCGDCYJWCZJZ5G","created_at":"2026-06-10T01:09:19.529641+00:00"},{"alias_kind":"pith_short_8","alias_value":"6NOCGDCY","created_at":"2026-06-10T01:09:19.529641+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":1,"internal_anchor_count":1,"sample":[{"citing_arxiv_id":"2604.17537","citing_title":"Surpassing thermal-state limit in thermometry via non-completely positive quantum encoding","ref_index":95,"is_internal_anchor":true}]},"formal_canon":{"evidence_count":2,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/6NOCGDCYJWCZJZ5GDGTOJPFJQ2","json":"https://pith.science/pith/6NOCGDCYJWCZJZ5GDGTOJPFJQ2.json","graph_json":"https://pith.science/api/pith-number/6NOCGDCYJWCZJZ5GDGTOJPFJQ2/graph.json","events_json":"https://pith.science/api/pith-number/6NOCGDCYJWCZJZ5GDGTOJPFJQ2/events.json","paper":"https://pith.science/paper/6NOCGDCY"},"agent_actions":{"view_html":"https://pith.science/pith/6NOCGDCYJWCZJZ5GDGTOJPFJQ2","download_json":"https://pith.science/pith/6NOCGDCYJWCZJZ5GDGTOJPFJQ2.json","view_paper":"https://pith.science/paper/6NOCGDCY","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=2507.03471&json=true","fetch_graph":"https://pith.science/api/pith-number/6NOCGDCYJWCZJZ5GDGTOJPFJQ2/graph.json","fetch_events":"https://pith.science/api/pith-number/6NOCGDCYJWCZJZ5GDGTOJPFJQ2/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/6NOCGDCYJWCZJZ5GDGTOJPFJQ2/action/timestamp_anchor","attest_storage":"https://pith.science/pith/6NOCGDCYJWCZJZ5GDGTOJPFJQ2/action/storage_attestation","attest_author":"https://pith.science/pith/6NOCGDCYJWCZJZ5GDGTOJPFJQ2/action/author_attestation","sign_citation":"https://pith.science/pith/6NOCGDCYJWCZJZ5GDGTOJPFJQ2/action/citation_signature","submit_replication":"https://pith.science/pith/6NOCGDCYJWCZJZ5GDGTOJPFJQ2/action/replication_record"}},"created_at":"2026-06-10T01:09:19.529641+00:00","updated_at":"2026-06-10T01:09:19.529641+00:00"}