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QI: Fachverband Quanteninformation

QI 23: Quantum Control

QI 23.8: Talk

Thursday, March 21, 2024, 11:30–11:45, HFT-FT 131

Robust quantum gates for dynamical correction of coherent errors — •Xiu-Hao Deng1,2, Yong-Ju Hai1, Yuanzhen Chen1,2, and Kangyuan Yi11Shenzhen Institute for Quantum Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China — 2Guangdong Provincial Key Laboratory of Quantum Science and Engineering, Southern University of Science and Technology, Shenzhen, 518055, China

In this talk, I will present our theory and experimental results. As quantum circuits become more integrated and complex, additional error sources that were previously insignificant start to emerge. Consequently, the fidelity of quantum gates benchmarked under pristine conditions falls short of predicting their performance in realistic circuits. To overcome this problem, we must evaluate their robustness against pertinent error models beyond isolated fidelity. Here we will report the theory of a geometric framework for diagnosing and correcting various errors and the experimental realization of robust quantum gates in superconducting quantum circuits based on this approach. Using quantum process tomography and randomized benchmarking, we demonstrate robust single-qubit gates against a quasi-static noise in a broad range of strengths, which is a common source of correlated errors. We also apply our method to non-static noises and to realize robust two-qubit gates. Our work provides a versatile toolbox for achieving noise-resilient complex quantum circuits.

Keywords: theory and experiment; Coherent errors; superconducting qubit; robust gate; geometric framework

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