Demonstration of high-fidelity gates in a strongly anharmonic with long-coherence C-shunt flux qubit
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.
Article Details
Journal Info
Applied Physics Letters
American Institute of Physics
Authors (16)
Silu Zhao
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences 1 , Beijing 100190,
Li Li
Weiping Yuan
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences 1 , Beijing 100190,
Xinhui Ruan
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences 1 , Beijing 100190,
Jinzhe Wang
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences 1 , Beijing 100190,
Bingjie Chen
Yunhao Shi
Guihan Liang
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences 1 , Beijing 100190,
Shi Xiao
Jiacheng Song
Jinming Guo
Xiaohui Song
Kai Xu
Heng Fan
Zhongcheng Xiang
Dongning Zheng