{"paper":{"title":"DC-powered broadband quantum-limited microwave amplifier","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"A voltage-biased SQUID amplifier provides 13 dB gain over 3.5 GHz while staying within 0.2 photons of the quantum limit using only DC power.","cross_cats":["cond-mat.mes-hall"],"primary_cat":"quant-ph","authors_text":"A. H. Esmaeili, A. Paquette, A. Rogalle, B. Monge, F. Cyrenne-Bergeron, M. Arabmohammadi, M. Hofheinz, N. Bourlet, N. Nehra, Y. Lapointe","submitted_at":"2025-12-22T22:07:08Z","abstract_excerpt":"Fast, high-fidelity, single-shot readout of superconducting qubits in quantum processors demands quantum-limited amplifiers to preserve the optimal signal-to-noise ratio. Typically, quantum-limited amplification is achieved with parametric down-conversion of a strong pump tone, which imposes significant hardware overhead and severely limits scalability. Here, we demonstrate the first DC-powered broadband amplifier operating within 0.2 photons of the quantum limit. Our impedance-engineered Inelastic Cooper-pair Tunneling Amplifier (ICTA)-a voltage-biased SQUID in which Cooper pairs tunnel inela"},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"Here, we demonstrate the first DC-powered broadband amplifier operating within 0.2 photons of the quantum limit.","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"The impedance engineering and semiclassical model fully capture device behavior without significant unmodeled quantum effects, fabrication variations, or losses that would degrade the claimed noise performance.","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"A voltage-biased SQUID-based ICTA delivers 13 dB average gain across 3.5 GHz bandwidth while operating within 0.2 photons of the quantum limit.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"},{"kind":"headline","text":"A voltage-biased SQUID amplifier provides 13 dB gain over 3.5 GHz while staying within 0.2 photons of the quantum limit using only DC power.","source":"verdict.pith_extraction.headline","status":"machine_extracted","claim_id":"C4","attestation":"unclaimed"}],"snapshot_sha256":"98eed4ea8e11e248fd1880887b31fb08e81a06ce1b07bbd86cf23aee18b53038"},"source":{"id":"2512.19902","kind":"arxiv","version":2},"verdict":{"id":"0041ad23-b406-4255-96b2-1f85b90dc58a","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-16T20:07:10.444565Z","strongest_claim":"Here, we demonstrate the first DC-powered broadband amplifier operating within 0.2 photons of the quantum limit.","one_line_summary":"A voltage-biased SQUID-based ICTA delivers 13 dB average gain across 3.5 GHz bandwidth while operating within 0.2 photons of the quantum limit.","pipeline_version":"pith-pipeline@v0.9.0","weakest_assumption":"The impedance engineering and semiclassical model fully capture device behavior without significant unmodeled quantum effects, fabrication variations, or losses that would degrade the claimed noise performance.","pith_extraction_headline":"A voltage-biased SQUID amplifier provides 13 dB gain over 3.5 GHz while staying within 0.2 photons of the quantum limit using only DC power."},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2512.19902/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":24,"sample":[{"doi":"","year":2016,"title":"D. Sank, Z. Chen, M. Khezri, J. Kelly, R. Barends, B. Campbell, Y. Chen, B. Chiaro, A. Dunsworth, A. Fowler, E. Jeffrey, E. Lucero, A. Megrant, J. Mu- tus, M. Neeley, C. Neill, P. J. J. O’Malley, C. Q","work_id":"cc7922bb-41b0-4792-9515-8cf486e33a56","ref_index":1,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2023,"title":"M. Khezri, A. Opremcak, Z. Chen, K. C. Miao, M. McEwen, A. Bengtsson, T. White, O. Naaman, D. Sank, A. N. Korotkov, Y. Chen, and V. Smelyanskiy, Phys. Rev. Appl.20, 054008 (2023)","work_id":"b3a0af6d-49fb-4097-8818-3e2316fd39e0","ref_index":2,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2008,"title":"M. A. Castellanos-Beltran, K. D. Irwin, G. C. Hilton, L. R. Vale, and K. W. Lehnert, Nature Physics4, 929 (2008)","work_id":"23a06b86-23ee-4b32-8be5-bf1c80fd4619","ref_index":3,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2010,"title":"Bergealet al., Nature465, 64 (2010)","work_id":"cc8b46e0-9043-4796-bdc4-b69edad7caa1","ref_index":4,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2014,"title":"J. Y. Mutus, T. C. White, R. Barends, Y. Chen, Z. Chen, B. Chiaro, A. Dunsworth, E. Jeffrey, J. Kelly, A. Megrant, C. Neill, P. J. J. O’Malley, P. Roushan, D. Sank, A. Vainsencher, J. Wenner, K. M. Su","work_id":"97f46970-6490-481a-979b-cbe68d38f716","ref_index":5,"cited_arxiv_id":"","is_internal_anchor":false}],"resolved_work":24,"snapshot_sha256":"d05fb5760a48c9f0f02c2e7ced35ce940e932f1f98626145b944ded67423d5f2","internal_anchors":0},"formal_canon":{"evidence_count":2,"snapshot_sha256":"52e5be3b95fd2a6192ff20da79dfcd9baeab9e5c41585ba3ddf1ca5de1e25e87"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}