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Applied Physics Letters / Volume 97 / Issue 21 / ELECTRONIC TRANSPORT AND SEMICONDUCTORS

Appl. Phys. Lett. 97, 212104 (2010); http://dx.doi.org/10.1063/1.3518919 (3 pages)

Triple quantum dot device designed for three spin qubits

T. Takakura1, M. Pioro-Ladrière2, T. Obata1, Y.-S. Shin3, R. Brunner4, K. Yoshida1, T. Taniyama5, and S. Tarucha1

1Department of Applied Physics, The University of Tokyo, Tokyo 113-8656, Japan
2Départment de Physique, Université de Sherbrooke, Quebec J1K 2R1, Canada
3Department of Materials Science and Engineering, Pohang University of Science and Technology, Gyeongsangbuk-do 790-784, Republic of Korea
4Institute of Physics, University of Leoben, Styria A-8700, Austria
5Materials and Structures Laboratory, Tokyo Institute of Technology, Kanagawa 226-8503, Japan and PRESTO, Japan Science and Technology Agency, Saitama 332-0012, Japan

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(Received 4 August 2010; accepted 29 October 2010; published online 23 November 2010)

Electron spin confined in quantum dots is a promising candidate for experimental qubits. Aiming at realizing a three spin-qubit system, we designed split micromagnets suitable for the lateral triple quantum dots. From numerical simulations of the stray magnetic field distribution, field gradients ∼ 0.8 T/μm and differences of in-plane components ∼ 10 mT can be attained, which enable the electrical and addressable manipulation of three qubits. Furthermore, this technique can be applied for up to 25 qubits in realistic multiple quantum dots. For the first step of implementing such three-qubit systems, a relevant triple quantum dot device has been fabricated and characteristic charge states were observed.

© 2010 American Institute of Physics

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KEYWORDS and PACS

Keywords

micromagnetics, numerical analysis, paramagnetic resonance, quantum computing, quantum dots

PACS

  • 81.07.Ta

    Quantum dots

  • 76.30.-v

    Electron paramagnetic resonance and relaxation

  • 75.75.-c

    Magnetic properties of nanostructures

  • 75.40.Mg

    Numerical simulation studies

  • 03.67.Lx

    Quantum computation architectures and implementations

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3518919

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
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    D. Schröer, A. D. Greentree, L. Gaudreau, K. Eberl, L. C. L. Hollenberg, J. P. Kotthaus, and S. Ludwig, Phys. Rev. B 76, 075306 (2007).

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    S. Amaha, T. Hatano, T. Kubo, S. Teraoka, Y. Tokura, S. Tarucha, and D. G. Austing, Appl. Phys. Lett. 94, 092103 (2009)APPLAB000094000009092103000001.

    C. Buizert, F. H. L. Koppens, M. Pioro-Ladrière, H. P. Tranitz, I. T. Vink, S. Tarucha, W. Wegscheider, and L. M. K. Vandersypen, Phys. Rev. Lett. 101, 226603 (2008).

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