2025/01/09 by Kosuke Noro, Motoya Shinozaki, Noro, Kosuke +15 · 2 citations
Engineering · #Acoustic Wave Resonator Technologies #Charge (physics) #Computer science #Electron #FOS: Physical sciences #Materials science #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Optoelectronics #Physics #Quantum dot #Quantum mechanics #Radio frequency #Reflectometry #Telecommunications #Time domain
paper · pdf · doi:10.48550/arxiv.2501.04949
published in arXiv (Cornell University) 26(1) (Cornell University)
openalex publication_date 2025/01/09 · openalex created_date 2025/01/11 · openalex updated_date 2026/07/31
Zinc oxide (ZnO) has garnered much attention as a promising material for quantum devices due to its unique characteristics. To utilize the potential of ZnO for quantum devices, the development of fundamental technological elements such as high-speed readout and charge sensing capabilities has become essential. In this study, we address these challenges by demonstrating radio-frequency (rf) reflectometry and charge sensing in ZnO quantum dots, thus advancing the potential for qubit applications. A device is fabricated on a high-quality ZnO heterostructure, featuring gate-defined target and sensor quantum dots. The sensor dot, integrated into an rf resonator circuit, enables the detection of single-electron charges in the target dots. Using this setup, the formation of few-electron double quantum dots is observed by obtaining their charge stability diagram. Also, a charge stability diagram with a gate pulse sequence is measured. We discuss the strong electron correlation in ZnO, which leads to nearly degenerate spin-singlet and -triplet two-electron states in the (0, 2) charge state, and the perspectives on spin-state readout.