Coherent Control of a Single Electron Spin with Electric Fields

作者：Katja C. Nowack, Frank H. L. Koppens, Yuli V. Nazarov, Lieven M. K. Vandersypen · 发表于：Science · 年份：2007 · DOI：10.1126/science.1148092 · 被引用次数：1013 · 研究领域：Quantum and electron transport phenomena、Advancements in Semiconductor Devices and Circuit Design、Semiconductor Quantum Structures and Devices

Manipulation of single spins is essential for spin-based quantum information processing. Electrical control instead of magnetic control is particularly appealing for this purpose, because electric fields are easy to generate locally on-chip. We experimentally realized coherent control of a single-electron spin in a quantum dot using an oscillating electric field generated by a local gate. The electric field induced coherent transitions (Rabi oscillations) between spin-up and spin-down with 90 degrees rotations as fast as approximately 55 nanoseconds. Our analysis indicated that the electrically induced spin transitions were mediated by the spin-orbit interaction. Taken together with the recently demonstrated coherent exchange of two neighboring spins, our results establish the feasibility of fully electrical manipulation of spin qubits.