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L.E. Fedichkin, M.V. Yanchenko, K.A. Valiev 
Novel coherent quantum bit Using spatial quantization levels in semiconductor quantum dot.

As basic elements of the quantum computer - quantum bits (qubits) we offer semiconductor quantum dots containing one electron each and consisting each of two tunnel-connected parts. The numerical solution of a Schroedinger equation with the account of Coulomb field of adjacent electrons shows, that in such structures the realization of a full set of basic logic operations which are necessary for fulfillment of quantum computations is possible. Durations of one- and two-qubit operations versus qubit geometry are obtained. Decoherence rates due to spontaneous emission of photons and acoustic phonons (due to both piezoelectric and deformation electron-phonon interaction) are evaluated. Analysis of these rates shows the offered qubit to be coherent enough to perform error correction procedures.

Citation:L.E. Fedichkin, M.V. Yanchenko, K.A. Valiev, Novel coherent quantum bit Using spatial quantization levels in semiconductor quantum dot., Quantum Computers and Computing, 2000, 1 (1), pp. 58-76.
Full text:PS (942 Kb, in Russian)