Phys. Rev. B 78, 075301 (2008) [6 pages]

Two-qubit conditional quantum-logic operation in a single self-assembled quantum dot

Abstract

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S. J. Boyle^1,*, A. J. Ramsay^1,†, F. Bello¹, H. Y. Liu², M. Hopkinson², A. M. Fox¹, and M. S. Skolnick¹
¹Department of Physics and Astronomy, University of Sheffield, Sheffield S3 7RH, United Kingdom
²Department of Electronic and Electrical Engineering, University of Sheffield, Sheffield S1 3JD, United Kingdom

Received 20 May 2008; published 1 August 2008

The four-level exciton/biexciton system of a single semiconductor quantum dot acts as a two-qubit register. We experimentally demonstrate an exciton-biexciton Rabi rotation conditional on the initial exciton spin in a single InGaAs/GaAs dot. This forms the basis of an optically gated two-qubit controlled rotation (CROT) quantum-logic operation where an arbitrary exciton spin is selected as the target qubit using the polarization of the control laser.

URL:

http://link.aps.org/doi/10.1103/PhysRevB.78.075301

DOI:

10.1103/PhysRevB.78.075301

PACS:

78.67.Hc, 03.67.Lx, 42.50.Hz, 78.47.jp

^*s.boyle@shef.ac.uk

^†a.j.ramsay@shef.ac.uk

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Phys. Rev. B 78, 075301 (2008) [6 pages]

Two-qubit conditional quantum-logic operation in a single self-assembled quantum dot