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Coupling and Entangling of Quantum States in Quantum Dot Molecules

Science  19 Jan 2001:
Vol. 291, Issue 5503, pp. 451-453
DOI: 10.1126/science.291.5503.451

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Abstract

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.

  • * 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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