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Indirect Coupling in a Cluster of Quantum-Dot-Based Charge Qubits

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We have theoretically studied a problem of the organization of controllable interactions among charge qubits in a three-qubit cluster. Our proposal is to use an auxiliary quantum dot structure that mediates interqubit coupling. A non-trivial evolution of the cluster is generated through the electromagnetically induced resonant single-electron conditional excitations in the structure. As we demonstrate, the two- and three-qubit operations CZ and CCZ based on conditional phase accumulation and, therefore, CNOT and Toffoli gates, can be performed with high accuracy in several steps at relatively short times.
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Keywords: AUXILIARY STRUCTURE; CHARGE QUBIT; INTERQUBIT COUPLING; OPTICAL DRIVING; QUANTUM DOTS; QUANTUM REGISTER

Document Type: Research Article

Publication date: 2010-09-01

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  • Journal of Computational and Theoretical Nanoscience is an international peer-reviewed journal with a wide-ranging coverage, consolidates research activities in all aspects of computational and theoretical nanoscience into a single reference source. This journal offers scientists and engineers peer-reviewed research papers in all aspects of computational and theoretical nanoscience and nanotechnology in chemistry, physics, materials science, engineering and biology to publish original full papers and timely state-of-the-art reviews and short communications encompassing the fundamental and applied research.
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