Day 1 Dec-2 2021
Session 1 11:30-12:15



Superconducting quantum computing

Xiaobo Zhu
xbzhu16@ustc.edu.cn
University of Science and Technology of China

In this talk, I will show our recent progress with our collaborators on superconducting multi-qubits system. We designed and fabricated several versions of quantum processor, on which integrated up to 66 quibts. The fidelity of single-bit gate and two-bit gate are calibrated by randomized benchmarking or parallel cross-entropy benchmarking. For the single-qubit gate, the average error is ~0.14% and that of the two-qubit gate is ~0.59%. I will also show some of the multi-qubits experiment results, e.g., genuine multiparticle entanglement for 12 superconducting qubits[1], quantum walks on a programmable two-dimensional 62-qubit superconducting processor[2], and strong quantum advantage[3].

References:
[1] Phys. Rev. Lett. 122, 110501 (2019).
[2] Science, 372, 948(2021).
[3] arXiv:2106.14734; arXiv:2109.03494



Prof. Xiaobo Zhu received his PhD in condensed matter physics at Institute of Physics, Chinese Academy of Sciences (IOP-China), Beijing in 2003. Between 2003 and 2008, he worked in IOP-China as intern, assistant professor and associated professor. In 2008, he joined NTT Basic Research Laboratories as Research Associate and Senior Research Associate. In 2013, he became a special assigned professor in IOP-China. In 2016, he joined University of science and technology of China as professor.

His team is dedicated to develop the scalable superconducting quantum computing. He have been responsible for developing several generations of highly coherent superconducting quantum processors, setting up ultra-low noise control and readout platform at millikelvin temperatures, and building up software and hardware of the room-temperature electronics. They developed a two-dimensional programmable superconducting quantum processor, Zuchongzhi, which is composed of 66 functional qubits in a tunable coupling architecture. Based on this state-of-the-art quantum processor, they achieved larger-scale random quantum circuit sampling, with a system scale of up to 60 qubits and 24 cycles and therefore exhibited strong quantum advantage. The achieved sampling task is about 6 orders of magnitude more difficult than that of Sycamore. in the best classic simulation.