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Quantum Electronics and Laser Science Conference

Tuning exchange interaction in colloidal nanocrystals

Stefan Rohrmoser, Andrei S. Susha, Rogach, Talapin, Weller, Harley, Pavlos G. Lagoudakis

Published Jan 1, 2008• 0 citations
Publisher
DOI
10.1109/qels.2008.4553254

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The present work evaluates the feasibility of quantum computing with exciton qubits in coupled colloidal semiconductor nanocrystals (NCs). A strategy for manipulating two-qubit states of colloidal NC hetero-dimers is described. We show that a sequence of laser pulses with the same photon energy can bring excitonic states of a nanocrystal hetero-dimer into entanglement and perform arbitrary qubit rotations (quantum gates). Our simulations of a realistic two-particle assembly of CdSe/CdS core/shell NCs demonstrate that such two-qubit gate operations can be driven by optical parametric oscillators with a theoretical error of 0.1%. A strategy for upscaling two-qubit hetero-dimers to N -qubit exciton gates in semiconductor NC assemblies is discussed.