Demonstration of high-fidelity gates in a strongly anharmonic with long-coherence C-shunt flux qubit

Applied Physics Letters 2026

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Authors: Silu Zhao, Li Li, Weiping Yuan, Xinhui Ruan, Jinzhe Wang, Bingjie Chen, Y Shi, Guihan Liang, Shi Xiao, Jiacheng Song, Jinming Guo, Xiaohui Song
+4 more Kai Xu, Heng Fan, Zhongcheng Xiang, Di Zheng
DOI: 10.1063/5.0311512
Cited by: 1
References: 45

Abstract

We demonstrate high-fidelity single-qubit gates on a C-shunt flux qubit that simultaneously combines a large anharmonicity (A/2π=848 MHz) with long relaxation time (T1=23 μs). The large anharmonicity significantly suppresses leakage to higher energy levels, enabling fast and precise microwave control. Using derivative removal by adiabatic gate pulses and randomized benchmarking, the qubit achieves gate fidelities exceeding 99.9%, highlighting the capability of C-shunt flux qubits for robust and high-performance quantum operations. These results establish them as a promising platform for scalable quantum information processing.

Fields of Study & Subjects

Quantum Information and Cryptography Mechanical and Optical Resonators Quantum and electron transport phenomena

Publication details

Journal / source
Applied Physics Letters
Publisher
AIP Publishing
Volume
128
Issue
15
Publication date
13 April 2026
Language
EN