Indirect Coupling in a Cluster of Quantum-Dot-Based Charge Qubits
Abstract: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.
Document Type: Research Article
Publication date: September 1, 2010
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