Tunable Coupling Scheme for Implementing High-Fidelity Two-Qubit Gates
Author(s)Yan, Fei; Krantz, Philip Johan Erik; Sung, Youngkyu; Kjaergaard, Morten; Campbell, Daniel Lawrence; Orlando, Terry Philip; Gustavsson, Simon; Oliver, William D; ... Show more Show less
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The prospect of computational hardware with quantum advantage relies critically on the quality of quantum-gate operations. Imperfect two-qubit gates are a major bottleneck for achieving scalable quantum-information processors. Here, we propose a generalizable and extensible scheme for a two-qubit tunable coupler 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 noninvasive 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.
DepartmentLincoln Laboratory; Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science; Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Research Laboratory of Electronics
Physical Review Applied
American Physical Society
Yan, Fei, et al. “Tunable Coupling Scheme for Implementing High-Fidelity Two-Qubit Gates.” Physical Review Applied, vol. 10, no. 5, Nov. 2018.
Final published version