{"paper":{"title":"Above 99.9% Fidelity Single-Qubit Gates, Two-Qubit Gates, and Readout in a Single Superconducting Quantum Device","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Alejandro Gomez Frieiro, Alessandro Landra, Alexander Plyshch, Alpo V\\\"alimaa, Andrew Guthrie, Anton Komlev, Antti Veps\\\"al\\\"ainen, Arthur Rebello, Attila Geresdi, Azad Karis, Brian Tarasinski, Caspar Ockeloen-Korppi, Chun Fai Chan, Daria Gusenkova, Eelis Takala, Eric Hyypp\\\"a, Fabian Marxer, Frank Deppe, Hao Hsu, Hsiang-Sheng Ku, Ivan Takmakov, Jaap Wesdorp, Jakub Mro\\.zek, Jani Tuorila, Janos Adam, Jeroen Verjauw, Johannes Heinsoo, Joni Ikonen, Joona Andersson, Juha Hassel, Jukka R\\\"abin\\\"a, Julia Lamprich, Jussi Ritvas, Kunal Mitra, Lan-Hsuan Lee, Leonid Abdurakhimov, Lihuang Zhu, Matthew Sarsby, Matthew Steggles, Michael Renger, Miikka Koistinen, Mykhailo Savytskyi, Nicola Wurz, Nizar Lethif, Olexiy Fedorets, Otto Salmenkivi, Outi Reentil\\\"a, Per Liebermann, Rohit Beriwal, Roope Kokkoniemi, Saga Dahl, Sami Laine, Sampo Saarinen, Seung-Goo Kim, Shan W. Jolin, Sinan Inel, Snigdha Kumar, Soumya Ranjan Das, Tuomas Myll\\\"ari, Tuukka Hiltunen, Tuure Orell, Ville Bergholm, Ville Selinmaa, Wei Liu, Wei Qiu, William Kindel, Zheming Gao","submitted_at":"2025-08-22T14:49:47Z","abstract_excerpt":"Achieving high-fidelity single-qubit gates, two-qubit gates, and qubit readout is critical for building scalable, error-corrected quantum computers. However, device parameters that enhance one operation often degrade the others, making simultaneous optimization challenging. Here, we demonstrate that careful tuning of qubit-coupler coupling strengths in a superconducting circuit with two transmon qubits coupled via a tunable coupler enables high-fidelity single- and two-qubit gates, without compromising readout performance. As a result, we achieve a 40h-averaged CZ gate fidelity of 99.93%, simu"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2508.16437","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2508.16437/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"}