2026-04-29 アルゴンヌ国立研究所（ANL）
A quiet qubit: An electron (represented by the ball) is controlled by a resonator (red wires) above a solid neon surface (the transparent square piece under the ball). Noise (disturbances) in the environment (represented by the distortion) becomes quiet around the electron and neon (clear area). (Image by Xu Han/Argonne National Laboratory.)
＜関連情報＞
- https://www.anl.gov/article/a-quieter-world-for-quantum
- https://www.nature.com/articles/s41928-026-01613-4
- https://tiisys.com/blog/2023/10/27/post-128619/
100 mK以上の温度における電子量子ビットの耐ノイズ性ホストとしての固体ネオン Solid neon as a noise-resilient host for electron qubits above 100 mK
Xinhao Li,Christopher S. Wang,Brennan Dizdar,Yizhong Huang,Yutian Wen,Wei Guo,Xufeng Zhang,Xu Han,Xianjing Zhou & Dafei Jin
Nature Electronics Published:29 April 2026
DOI:https://doi.org/10.1038/s41928-026-01613-4
Abstract
Solid neon can be used as a solid host for single-electron qubits. At temperatures of around 10 mK, electron-on-solid-neon charge qubits exhibit long coherence times and high operation fidelities. However, a systematic characterization of the noise features of such systems is needed for the development of scalable quantum information architectures. Here we show that solid neon can be used as a noise-resilient host for electron qubits above 100 mK. We examine the resilience of solid neon against charge and thermal noise when electron-on-solid-neon charge qubits are operated away from the charge-insensitive sweet spot and at elevated temperatures. We show that the extracted high-frequency charge noise density of electron-on-solid-neon qubits, projected as voltage fluctuations on nearby electrodes, is between 10−4 μV2 Hz−1 and 10−6 μV2 Hz−1 at 0.01 MHz to 1 MHz, which is comparable to common semiconductor hosts. We also show that the electron-on-solid-neon charge qubits operating at frequencies of around 5 GHz can maintain echo coherence times of over 1 μs at temperatures up to 400 mK.
