题目：High-fidelity gates and readout for superconducting quantum computers

报告人：Yasu Nakamura

邀请人：王浩华

时间：2025年9月17日（周三）14:00

地点：紫金港校区海纳苑8幢215报告厅

摘要：

Superconducting quantum computing technology has made significant progress since the first demonstration of a superconducting qubit more than a quarter-century ago. However, there remain many challenges towards the realization of a full-stack quantum computer, as quantum computing requires high-precision control and measurement of large-scale quantum systems with many degrees of freedom. We are developing technologies for superconducting quantum computing platforms, aiming at scalable, fast, and high-fidelity operations. Our efforts include 2D integration of transmon qubits, fast (<100 ns), high-fidelity (>99.9%) frequency-multiplexed qubit readout [1], fast (<50 ns), high-fidelity (>99.9%) two-qubit gates with a tunable double-transmon coupler [2,3], and broadband low-noise Josephson traveling-wave parametric amplifiers [4].  

[1] P.A. Spring et al., PRX Quantum 6, 020345 (2025).

[2] R. Li et al., Phys. Rev. X 14, 041050 (2024).

[3] R. Li et al., Phys. Rev. Applied. 23, 064069 (2025).

[4] C.W.S. Chang et al., arXiv:2503.07559.

个人简介：

Yasu Nakamura began his research career at NEC Fundamental Research Laboratories in 1992, where he demonstrated the first coherent manipulation of a superconducting qubit in 1999 and met quantum information science. He spent a year as a Visiting Researcher at TU Delft from 2001 to 2002. Since 2012, he has been a Professor at The University of Tokyo. He has also led his research team at RIKEN since 2014. He has been the founding Director of the RIKEN Center for Quantum Computing since 2021 and the Project Leader of the MEXT Q-LEAP Flagship project on Superconducting Quantum Computing since 2018.