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Science 19 January 2001:
Vol. 291. no. 5503, pp. 451 - 453
DOI: 10.1126/science.291.5503.451
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Reports
Coupling and Entangling of Quantum States in Quantum Dot Molecules
M. Bayer,1*
P. Hawrylak,2*
K. Hinzer,23
S. Fafard,2
M. Korkusinski,23
Z. R. Wasilewski,2
O. Stern,1
A. Forchel1
We demonstrate coupling and entangling of quantum states in a pair
of vertically aligned, self-assembled quantum dots by studying the
emission of an interacting electron-hole pair (exciton) in a single dot
molecule as a function of the separation between the dots. An
interaction-induced energy splitting of the exciton is observed that
exceeds 30 millielectron volts for a dot layer separation of 4 nanometers. The results are interpreted by mapping the tunneling of a
particle in a double dot to the problem of a single spin. The
electron-hole complex is shown to be equivalent to entangled states of
two interacting spins.
1 Physikalisches Institut, Universität
Würzburg, Am Hubland, D-97074 Würzburg, Germany.
2 Institute for Microstructural Sciences, National
Research Council, Ottawa, K1A 0R6, Canada.
3 Physics
Department, University of Ottawa, Ottawa, Ontario, K1N 6N5, Canada.
*
To whom correspondence should be addressed. E-mail:
mbayer{at}physik.uni-wuerzburg.de (M.B.); pawel.hawrylak{at}nrc.ca
(P.H.)
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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
- Optical Signatures of Coupled Quantum Dots.
- E. A. Stinaff, M. Scheibner, A. S. Bracker, I. V. Ponomarev, V. L. Korenev, M. E. Ware, M. F. Doty, T. L. Reinecke, and D. Gammon (2006)
Science
311, 636-639
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- Probing and Controlling the Bonds of an Artificial Molecule.
- A. W. Holleitner, R. H. Blick, A. K. Huttel, K. Eberl, and J. P. Kotthaus (2002)
Science
297, 70-72
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