title: Fast electrical control of single electron spins in quantum dots with vanishing influence from nuclear spins.
abstract: We demonstrate fast universal electrical spin manipulation with inhomogeneous magnetic fields. With fast Rabi frequency up to 127 MHz, we leave the conventional regime of strong nuclear-spin influence and observe a spin-flip fidelity >96%, a distinct chevron Rabi pattern in the spectral-time domain, and a spin resonance linewidth limited by the Rabi frequency, not by the dephasing rate. In addition, we establish fast z rotations up to 54 MHz by directly controlling the spin phase. Our findings will significantly facilitate tomography and error correction with electron spins in quantum dots.
authors.affiliation: Department of Applied Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan and RIKEN, Center for Emergent Matter Science, Hirosawa 2-1, Wako-shi, Saitama 351-0198, Japan.
authors.forename: J
authors.initials: J
authors.lastname: Yoneda
authors.affiliation: Department of Applied Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan and RIKEN, Center for Emergent Matter Science, Hirosawa 2-1, Wako-shi, Saitama 351-0198, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Otsuka
authors.affiliation: Department of Applied Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan and RIKEN, Center for Emergent Matter Science, Hirosawa 2-1, Wako-shi, Saitama 351-0198, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Nakajima
authors.affiliation: Department of Applied Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Takakura
authors.affiliation: Department of Applied Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Obata
authors.affiliation: Département de Physique, Université de Sherbrooke, Sherbrooke, Québec J1K 2R1, Canada and CIFAR Program in Quantum Information Science, Canadian Institute for Advanced Research (CIFAR), Toronto, Ontario M5G 1Z8, Canada.
authors.forename: M
authors.initials: M
authors.lastname: Pioro-Ladrière
authors.affiliation: Materials Department, University of California, Santa Barbara, California 93106, USA.
authors.forename: H
authors.initials: H
authors.lastname: Lu
authors.affiliation: Materials Department, University of California, Santa Barbara, California 93106, USA and Electrical and Computer Engineering, University of California, Santa Barbara, California 93106, USA.
authors.forename: C J
authors.initials: CJ
authors.lastname: Palmstrøm
authors.affiliation: Materials Department, University of California, Santa Barbara, California 93106, USA.
authors.forename: A C
authors.initials: AC
authors.lastname: Gossard
authors.affiliation: Department of Applied Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan and RIKEN, Center for Emergent Matter Science, Hirosawa 2-1, Wako-shi, Saitama 351-0198, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Tarucha