A research group led by Professor Seigo Tarucha (Graduate School of Engineering), Professor Kohei Ito (Keio University), and Associate Professor Tetsuo Kodera (Tokyo Institute of Technology) has realized an electron spin qubit with the world’s highest computational accuracy using an isotope-controlled silicon substrate. By forming quantum dot elements on the isotope-controlled silicon substrate and combining them with a specially shaped magnet to perform high-speed spin manipulation, they have simultaneously achieved an operation speed about 100 times faster and an information retention time about 10 times longer than that of conventional qubits. In addition, the error rate of the quantum operation was successfully reduced to one-tenth that of the conventional top data. These results were published in the electronic edition of Nature Nanotechnology on December 18.
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