Selective coherent destruction of tunneling in a quantum-dot array

Details Selective coherent destruction of tunneling in a quantum-dot array Selective coherent destruction of tunneling in a quantum-dot array

2004-03-17

arxiv.org/abs/cond-mat/0403447v1

Phys. Rev. B 70, 041302(R) (2004)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 5 figures, submitted to PRB Rapid Comm

Scientific paper

10.1103/PhysRevB.70.041302

The coherent manipulation of quantum states is one of the main tasks required in quantum computation. In this paper we demonstrate that it is possible to control coherently the electronic position of a particle in a quantum-dot array. By tuning an external ac electric field we can selectively suppress the tunneling between dots, trapping the particle in a determined region of the array. The problem is treated non-perturbatively by a time-dependent Hamiltonian in the effective mass approximation and using Floquet theory. We find that the quasienergy spectrum exhibits crossings at certain field intensities that result in the selective suppression of tunneling.

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