Optically Induced Entanglement of Excitons in a Single Quantum Dot

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Science  15 Sep 2000:
Vol. 289, Issue 5486, pp. 1906-1909
DOI: 10.1126/science.289.5486.1906

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Optically induced entanglement is identified by the spectrum of the phase-sensitive homodyne-detected coherent nonlinear optical response in a single gallium arsenide quantum dot. The electron-hole entanglement involves two magneto-excitonic states differing in transition energy and polarization. The strong coupling needed for entanglement is provided through the Coulomb interaction involving the electrons and holes. The result presents a first step toward the optical realization of quantum logic operations using two or more quantum dots.

  • * Present address: Bell Laboratories, 101 Crawfords Corner Road, Holmdel, NJ 07733, USA.

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