Quantum Information Processing Using Quantum Dot Spins and Cavity QED

Phys. Rev. Lett. 83, 4204 – Published 15 November 1999
A. Imamog¯lu, D. D. Awschalom, G. Burkard, D. P. DiVincenzo, D. Loss, M. Sherwin, and A. Small


The electronic spin degrees of freedom in semiconductors typically have decoherence times that are several orders of magnitude longer than other relevant time scales. A solid-state quantum computer based on localized electron spins as qubits is therefore of potential interest. Here, a scheme that realizes controlled interactions between two distant quantum dot spins is proposed. The effective long-range interaction is mediated by the vacuum field of a high finesse microcavity. By using conduction-band-hole Raman transitions induced by classical laser fields and the cavity-mode, parallel controlled-not operations, and arbitrary single qubit rotations can be realized.

DOI: http://dx.doi.org/10.1103/PhysRevLett.83.4204

  • Received 27 April 1999
  • Revised 15 July 1999
  • Published in the issue dated 15 November 1999

© 1999 The American Physical Society

Authors & Affiliations

A. Imamog¯lu1,2, D. D. Awschalom2, G. Burkard3, D. P. DiVincenzo4, D. Loss3, M. Sherwin2, and A. Small2

  • 1Department of Electrical and Computer Engineering, University of California, Santa Barbara, California 93106
  • 2Department of Physics, University of California, Santa Barbara, California 93106
  • 3Department of Physics and Astronomy, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland
  • 4IBM Research Division, T. J. Watson Research Center, P.O. Box 218, Yorktown Heights, New York 10598

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