Fast electrical control of single electron spins in quantum dots with vanishing influence from nuclear spins

J Yoneda; T Otsuka; T Nakajima; T Takakura; T Obata; M Pioro-Ladrière; H Lu; C J Palmstrøm; A C Gossard; S Tarucha

doi:10.1103/PhysRevLett.113.267601

Fast electrical control of single electron spins in quantum dots with vanishing influence from nuclear spins

Phys Rev Lett. 2014 Dec 31;113(26):267601. doi: 10.1103/PhysRevLett.113.267601. Epub 2014 Dec 23.

Authors

J Yoneda¹, T Otsuka¹, T Nakajima¹, T Takakura², T Obata², M Pioro-Ladrière³, H Lu⁴, C J Palmstrøm⁵, A C Gossard⁴, S Tarucha¹

Affiliations

¹ 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.
² Department of Applied Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
³ 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.
⁴ Materials Department, University of California, Santa Barbara, California 93106, USA.
⁵ Materials Department, University of California, Santa Barbara, California 93106, USA and Electrical and Computer Engineering, University of California, Santa Barbara, California 93106, USA.

PMID: 25615383
DOI: 10.1103/PhysRevLett.113.267601

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.