RQC Seminar

178th RQC Seminar

• Speaker

  Dr. Anton Frisk Kockum
  ( Chalmers University of Technology, Sweden )

• Date

  13:10-14:10 (1:10 -2:10 p.m.), December 27, 2024 (Friday)

• Venue

  Hybrid(ZOOM・ Room 345-347 at Wako Main Research Building 3F (C01))

• Title

  Architecture considerations for superconducting quantum processors

• Inquiries

  norilab_rqc_assist[at]ml.riken.jp

Abstract
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