Advancing Quantum Computing with Zinc Oxide Quantum Dots

Researchers at Tohoku University, in collaboration with the National Institute for Materials Science (NIMS) and the University of Tokyo, have taken an important step toward semiconductor quantum computing using zinc oxide (ZnO).

Semiconductor quantum dots are promising building blocks for scalable quantum computers because they can confine individual electrons and use their spins to store quantum information.

However, rapidly and accurately detecting the charge state of electrons in ZnO quantum dots has remained a challenge.

To address this, the researchers fabricated a ZnO device containing two target quantum dots (QD1 and QD2) alongside a sensor quantum dot (SQD), which acts as a sensitive electrometer.

The research team's next steps include demonstrating electron spin readout and manipulation in ZnO quantum dots, as well as measuring key properties such as spin relaxation and coherence times.