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HL: Fachverband Halbleiterphysik

HL 88: Quantum Dots and Wires: Transport Properties IV (mainly Double Dots and Point Contacts)

HL 88.2: Vortrag

Donnerstag, 29. März 2012, 16:45–17:00, EW 202

(contribution withdrawn) Spin Based Quantum Computation with Quantum Dots Including Micro-Magnet Technique — •Roland Brunner^1,2, Yun Suk Shin², Toshiaki Obata³, Michel Pioro-Ladriere⁴, Toshihiro Kubo⁵, Koji Yoshida³, Tomoyasu Taniyama⁶, Yasuhiro Tokura⁵, and Seigo Tarucha³ — ¹Institute of Physics, Montanuniversitaet Leoben, 8700, Austria — ²Quantum Spin Information Project, ICORP, Japan Science and Technology Agency, Atsugi-shi, Kanagawa, 243-0198, Japan — ³Department of Applied Physics, University of Tokyo, Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan — ⁴Département de Physique, Université de Sherbrooke, Sherbrooke, Québec, J1K-2R1, Canada — ⁵NTT Basic Research Laboratories, NTT Corporation, Atsugi-shi, Kanagawa, 243-0198, Japan — ⁶Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Yokohama, 226-8503, Japan

Here, we present in a semiconductor double quantum dot, the realization of a two-qubit quantum gate. The approach is based on the combination of spin exchange control and on single spin rotations [1]. The all-electrical two-qubit quantum gate [1] is accomplished in an GaAs/AlGaAs double quantum dot with a novel split micro-magnet. The micro-magnet is used to generate an inhomogeneous magnetic field necessary for the manipulation of the single electron spin [2,3,4]. References: [1] Brunner et al. Phys. Rev. Lett. 107 146801 (2011). [2] Pioro-Ladrière, M. et al. Nature Physics 4, 776 (2008). [3] Obata, T. et al. Phys. Rev. B 81, 085317 (2010). [4] Y. Tokura et al. Phys. Rev. Lett. 96, 047202 (2006).