期刊
PHYSICAL REVIEW LETTERS
卷 127, 期 8, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.127.080505
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The article introduces a modified tunable bus architecture suitable for fixed-frequency qubits, achieving high-fidelity 2-qubit operations. Experimental results demonstrate a maximum gate fidelity of 99.85% with good calibration stability over one day.
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.
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