2018/03/26 by Fei Yan, Philip Krantz, Youngkyu Sung +6 · 6 citations
Physics and Astronomy · #quant-ph
paper · pdf · doi:10.1103/physrevapplied.10.054062
published as Phys. Rev. Applied 10, 054062 (2018)
arxiv created 2018/03/26 · arxiv updated 2018/12/05
The prospect of computational hardware with quantum advantage relies critically on the quality of quantum gate operations. Imperfect two-qubit gates is a major bottleneck for achieving scalable quantum information processors. Here, we propose a generalizable and extensible scheme for a two-qubit coupler switch that controls the qubit-qubit coupling by modulating the coupler frequency. Two-qubit gate operations can be implemented by operating the coupler in the dispersive regime, which is non-invasive to the qubit states. We investigate the performance of the scheme by simulating a universal two-qubit gate on a superconducting quantum circuit, and find that errors from known parasitic effects are strongly suppressed. The scheme is compatible with existing high-coherence hardware, thereby promising a higher gate fidelity with current technologies.