• Featured in Physics
  • Editors' Suggestion

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
Physics logo See Viewpoint: One, Two, Bits of Spin
PDFHTMLExport Citation

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.

  • Figure
  • Figure
  • Figure
  • Figure
  • Received 18 March 2011

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

© 2011 American Physical Society

Viewpoint

Key Image

One, Two, Bits of Spin

Published 26 September 2011

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

See more in Physics

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

Article Text (Subscription Required)

Click to Expand

Supplemental Material (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 107, Iss. 14 — 30 September 2011

Reuse & Permissions
Access Options
Collection
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.

APS and CERN Sign Open Access Agreement for SCOAP3

APS and CERN, the host organization of SCOAP3 (Sponsoring Consortium for Open Access Publishing in Particle Physics), have signed an agreement to make the high-energy physics (HEP) articles published in three leading APS journals open access beginning January 1, 2018. This agreement acts to support the publishing of open access content for wider benefit of the HEP community.

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review Letters

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×