{"paper":{"title":"High-Coherence and High-frequency Quantum Computing: The Design of a High-Frequency, High-Coherence and Scalable Quantum Computing Architecture","license":"http://creativecommons.org/licenses/by/4.0/","headline":"A proposed 8-qubit transmon chip operates at 12 GHz using tantalum and niobium tri-layer junctions to reach 1.9 ms relaxation times and quality factors of 2.75 x 10^7.","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Masroor H. S. Bukhari","submitted_at":"2026-01-29T10:43:43Z","abstract_excerpt":"High-coherence, fault-tolerant and scalable quantum computing architectures with unprecedented long coherence times, faster gates, low losses and low bit-flip errors may be one of the only ways forward to achieve the true quantum advantage. In this context, high-frequency high-coherence (HCQC) qubits with new high-performance topologies could be a significant step towards efficient and high-fidelity quantum computing by facilitating compact size, higher scalability and higher than conventional operating temperatures. Although transmon type qubits are designed and manufactured routinely in the "},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"The architecture is designed to achieve average relaxation times of up to 1.9 ms with average quality factors of up to 2.75 x 10^7 at a central operating frequency of 12.0 GHz using tantalum and niobium/aluminum/aluminum oxide tri-layer structures.","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"That the referenced advances in superconducting junction manufacturing using tantalum and Nb/Al/AlOx tri-layers on high-resistivity silicon will deliver the stated coherence times and quality factors when operated in the 11-13.5 GHz range without introducing additional high-frequency loss mechanisms.","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"The paper proposes an 8-qubit transmon design at 12 GHz targeting 1.9 ms relaxation times and quality factors of 2.75e7 via tantalum and Nb/Al/AlOx fabrication on silicon.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"},{"kind":"headline","text":"A proposed 8-qubit transmon chip operates at 12 GHz using tantalum and niobium tri-layer junctions to reach 1.9 ms relaxation times and quality factors of 2.75 x 10^7.","source":"verdict.pith_extraction.headline","status":"machine_extracted","claim_id":"C4","attestation":"unclaimed"}],"snapshot_sha256":"bf6c6c37d5e34af202d8ac7024eafd38e347259764e33b5c96007dcd77ac84fe"},"source":{"id":"2601.21528","kind":"arxiv","version":2},"verdict":{"id":"0f3fcfa8-0f4a-4d85-9d85-9fa00429c490","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-16T09:51:47.074576Z","strongest_claim":"The architecture is designed to achieve average relaxation times of up to 1.9 ms with average quality factors of up to 2.75 x 10^7 at a central operating frequency of 12.0 GHz using tantalum and niobium/aluminum/aluminum oxide tri-layer structures.","one_line_summary":"The paper proposes an 8-qubit transmon design at 12 GHz targeting 1.9 ms relaxation times and quality factors of 2.75e7 via tantalum and Nb/Al/AlOx fabrication on silicon.","pipeline_version":"pith-pipeline@v0.9.0","weakest_assumption":"That the referenced advances in superconducting junction manufacturing using tantalum and Nb/Al/AlOx tri-layers on high-resistivity silicon will deliver the stated coherence times and quality factors when operated in the 11-13.5 GHz range without introducing additional high-frequency loss mechanisms.","pith_extraction_headline":"A proposed 8-qubit transmon chip operates at 12 GHz using tantalum and niobium tri-layer junctions to reach 1.9 ms relaxation times and quality factors of 2.75 x 10^7."},"references":{"count":56,"sample":[{"doi":"","year":null,"title":"they have shown that a surface treatment in the form of a fluorine -based application aided with argon -based ion milling helps remove the germanium and oxide re sidues, resulting in conspicuously imp","work_id":"a35f41ec-a272-4f4e-990a-e36d32d15993","ref_index":1,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":null,"title":"The three important sub -sections of this section are the cryogenic readout and control, the room -temperature electronics and the interface with a digital co mputational and control system. The reado","work_id":"3435b817-2fa1-4f49-84e0-a61f86fc366b","ref_index":2,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2008,"title":"A. A. Houck et al. , Controlling the Spontaneous Emission of a Superconducting Transmon Qubit, Phys. Rev. Lett. 101, 080502 (2008)","work_id":"2bb4b5c0-d39a-4697-a9b3-fdf226f22517","ref_index":3,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2007,"title":"J. Koch, M. Y. Terri, J. Gambetta, A. A. Houck, D. I. Schuster, J. Majer, A. B lais, M. H. Devoret, S. M. Girvin, and R. J. Schoelkopf, Charge -insensitive qubit design derived from the Cooper pair bo","work_id":"cbc49353-23eb-4695-949b-e10686630ffe","ref_index":4,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2013,"title":"R. Barends, J. Kelly, A. Megrant, D. Sank, E. Jeffrey, Y. Chen, Y. Yin, B. Chiaro, J. Mutus, C. Neill, et al. , Coherent Josephson qubit suitable for scalable quantum integrated circuits, Phys. Rev. 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