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Two-Qubit Gate of Combined Single-Spin Rotation and Interdot Spin Exchange in a Double Quantum Dot

R. Brunner, Y.-S. Shin, T. Obata, M. Pioro-Ladrière, T. Kubo, K. Yoshida, T. Taniyama, Y. Tokura, and S. Tarucha
Phys. Rev. Lett. 107, 146801 – Published 26 September 2011
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Abstract

A crucial requirement for quantum-information processing is the realization of multiple-qubit quantum gates. Here, we demonstrate an electron spin-based all-electrical two-qubit gate consisting of single-spin rotations and interdot spin exchange in a double quantum dot. A partially entangled output state is obtained by the application of the two-qubit gate to an initial, uncorrelated state. We find that the degree of entanglement is controllable by the exchange operation time. The approach represents a key step towards the realization of universal multiple-qubit gates.

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  • Received 18 March 2011

DOI:https://doi.org/10.1103/PhysRevLett.107.146801

© 2011 American Physical Society

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One, Two, Bits of Spin

Published 26 September 2011

Combining operations with one and two spin qubits may lead to superior quantum computers.

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Authors & Affiliations

R. Brunner1,2,*, Y.-S. Shin1, T. Obata1,3, M. Pioro-Ladrière4, T. Kubo5, K. Yoshida1, T. Taniyama6,7, Y. Tokura1,5, and S. Tarucha1,3

  • 1Quantum Spin Information Project, ICORP, Japan Science and Technology Agency, Atsugi-shi, Kanagawa, 243-0198, Japan
  • 2Institute of Physics, Montanuniversitaet Leoben, 8700, Austria
  • 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
  • 7PRESTO, Japan Science and Technology Agency, 4-1-8 Honcho Kawaguchi, Saitama 332-0012, Japan

  • *Corresponding author. roland.brunner@unileoben.ac.at

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Issue

Vol. 107, Iss. 14 — 30 September 2011

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