Speaker: Anton Frisk Kockum
Affiliation: Chalmers University of Technology
Date: Tuesday, 21 January 2025 at 12:00
Location: Online seminar
Selecting the architecture of a superconducting quantum processor requires making many design choices, sometimes trying to meet conflicting demands. In this talk, I will discuss the architecture we have developed for our processors in the Wallenberg Centre for Quantum Technology. I will show how we use tunable couplers between fixed-frequency transmon qubits to realize various two- and three-qubit gates based on parametric modulation of the couplers [1,2,3], and how the frequencies of the qubits are chosen to avoid crosstalk between such gates in a square lattice containing several tens, or more, qubits [4]. I will also discuss how we can both mitigate and use ZZ coupling between the qubits in this setup [5], as well as quantify the impact of decoherence for all gates in a simple way [6,7]. [1] Kosen et al., Quantum Sci. Technol. 7, 035018 (2022) [2] Gu et al., PRX Quantum 2, 040348 (2021) [3] Warren et al., npj Quantum Inf. 9, 44 (2023) [4] Osman et al., Phys. Rev. Res. 5, 043001 (2023) [5] Pettersson Fors et al., arXiv:2408.15402 [6] Abad et al., Phys. Rev. Lett. 129, 150504 (2022) [7] Abad et al., arXiv:2302.13885