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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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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


© 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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Vol. 107, Iss. 14 — 30 September 2011

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Heating up of Superconductors
January 27, 2017

This collection marks the 30th anniversary of the discovery of high-temperature superconductors. The papers selected highlight some of the advances that have been made to date, both in understanding why these compounds behave in the way they do, and in utilizing them in applications. The papers included in the collection have been made free to read.

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