2021/01/19 by J. Stehlik, D. M. Zajac, D. L. Underwood +17 · 4 citations
Computer Science · Engineering · Physics and Astronomy · #Computer science #Coupling (piping) #Electrical engineering #Electronic engineering #Engineering #Fidelity #Materials science #Optoelectronics #Physics #Quantum #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum and electron transport phenomena #Quantum computer #Quantum mechanics #Qubit #Scalability #Superconducting quantum computing #Telecommunications #Topology (electrical circuits) #Transmon #quant-ph
paper · pdf · doi:10.1103/physrevlett.127.080505
published as Phys. Rev. Lett. 127, 080505 (2021)
arxiv created 2021/01/19 · openalex publication_date 2021/08/20 · arxiv updated 2021/08/25 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/29
Implementation of high-fidelity 2-qubit operations is a key ingredient for scalable quantum error correction. In superconducting qubit architectures, tunable buses have been explored as a means to higher-fidelity gates. However, these buses introduce new pathways for leakage. Here we present a modified tunable bus architecture appropriate for fixed-frequency qubits in which the adiabaticity restrictions on gate speed are reduced. We characterize this coupler on a range of 2-qubit devices, achieving a maximum gate fidelity of 99.85%. We further show the calibration is stable over one day.