Speaker: Dr. Xiao Xue, Delft University of Technology

Host: Prof. Li Lu, Institute of Physics, CAS

Time: 15:00 pm, February 21st, 2023

Abstract:

In this talk, I will give an overview on our vision on quantum computing with electron spin qubits, and discuss the progress and challenges in making fault-tolerant, fully integrated silicon quantum circuits [1]. I will first present our work on characterizing gate fidelities, including the realization of a high-fidelity two-qubit gate and the challenges in correlated noise and crosstalk errors [2, 3, 4]. Then I will steer the focus to quantum control of spin qubits using a cryo-CMOS chip, named "Horse Ridge", which is a first step towards solving the wiring issues at the quantum-classical interface [5]. Finally, I will extend the discussion to other spin qubit experiments.

Reference:

[1] L. M. K. Vandersypen, et al., npj Quantum Information 3, 34 (2017).

[2] X. Xue, et al., PRX 9, 021011 (2019).

[3] X. Xue, et al., PRX 10, 021006 (2020).

[4] X. Xue, et al., Nature 601, 343–347 (2022).

[5] X. Xue, et al., Nature 593, 205–210 (2021).

Brief CV of Dr. Xiao Xue:

Xiao Xue is a postdoc researcher at QuTech, TU Delft. He obtained his B.Sc. in USTC and Ph.D. in TU Delft (Cum Laude). Supervised by Prof. Lieven Vandersypen (director of QuTech), he worked on quantum computing with spin qubits in silicon, covering the topics of high-fidelity two-qubit gate, quantum nondemolition measurement, cryogenic quantum control, etc. Now his interest is in distant two-qubit gates of spin qubits using microwave photons in a superconducting resonator. So far, he has conducted multiple high-impact studies, including two publications in Nature and two in PRX. He co-authored a number of conference proceedings such as ISSCC and IEDM, and he owns 1 US patent. In addition, he serves as a reviewer for PRL, PRX Quantum, PRB, Nano Letters, etc.