High-fidelity control and readout of superconducting qubits
Yasu Nakamura -RIKEN Center for Quantum Computing
Abstract:
Superconducting quantum computing technologies have made significant progress in the last few decades. State-of-the-art experiments nowadays operate on more than a hundred qubits, with two-qubit gate fidelities exceeding 99% and approaching 99.9%, enabling demonstrations of quantum error correction and logical error suppression. However, to achieve more drastic reductions in logical error rates and quantum error-correction overhead, which are required for large-scale fault-tolerant quantum computing, we need to improve further the gate and readout fidelities at the physical-qubit level. In this talk, we discuss our approaches to the end [1-7]. As the current target of 99.9% has nearly been achieved, raising it to 99.99% will be the next challenge.
[1] R. Li, K. Kubo, Y. Ho, Z. Yan, Y. Nakamura, and H. Goto, Phys. Rev. X 14, 041050 (2024).
[2] R. Li, K. Kubo, Y. Ho, Z. Yan, S. Inoue, Y. Nakamura, and H. Goto, Phys. Rev. Appl. 23, 064069 (2025).
[3] S. Inoue, R. Li, K. Kubo, Y. Ho, Y. Nakamura, and H. Goto, arXiv:2604.27679.
[4] S. Shirai, S. Inoue, S. Tamate, R. Li, Y. Nakamura, and A. Noguchi, Phys. Rev. Res. 8, 033261 (2026).
[5] P.A. Spring, L. Milanovic, Y. Sunada, S. Wang, A.F. van Loo, S. Tamate, and Y. Nakamura, PRX Quantum 6, 020345 (2025).
[6] P.A. Spring, A.L. Hesse, S. Wang, S. Tamate, and Y. Nakamura, arXiv:2608.25484.
[7] C.W.S. Chang, A.F. van Loo, C.-C. Hung, Y. Zhou, C. Gnandt, S. Tamate, and Y. Nakamura, Phys. Rev. Applied 24, 044081 (2025).
Location: QNC 0101