Coupling and entangling of quantum states in quantum dot molecules |
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Authors: | Bayer M Hawrylak P Hinzer K Fafard S Korkusinski M Wasilewski Z R Stern O Forchel A |
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Affiliation: | Physikalisches Institut, Universit?t Würzburg, Am Hubland, D-97074 Würzburg, Germany. mbayer@physik.uni-wuerzburg.de |
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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. |
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