Solid neon as a noise-resilient host for electron qubits above 100 mK

TL;DR

Solid neon serves as a noise-resilient host for electron qubits, maintaining coherence and low noise levels at temperatures above 100 mK, which is promising for scalable quantum computing.

Contribution

This work demonstrates that solid neon can host electron qubits with high coherence and noise resilience at elevated temperatures, expanding the operational range for quantum devices.

Findings

High-frequency charge noise density is comparable to semiconductor hosts.

Electron qubits maintain over 1 μs coherence at 400 mK.

Solid neon remains resilient against charge and thermal noise at elevated temperatures.

Abstract

Solid neon can be used as a solid host for single-electron qubits, and at temperatures of around 10 mK, electron-on-solid-neon charge qubits exhibit long coherence times and high operation fidelities. However, 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 $10^{-4}$ and $10^{-6}~\mathrm{\mu V^2/Hz}$ at 0.01 to 1 MHz, which is comparable with common semiconductor hosts. We also show that the electron-on-solid-neon charge qubits operating around 5 GHz frequencies can maintain echo coherence times of over 1 $\mu$s at temperatures up to 400 mK.