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arXiv:1010.3505 · Physical Review A

Adiabatic quantum state transfer in a nonuniform triple-quantum-dot system

Bing Chen, Wei Fan, Yan Xu

Published Jan 18, 2011• 15 citations
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Abstract

We introduce an adiabatic quantum state transfer scheme in a nonuniform coupled triple-quantum-dot system. By adiabatically varying the external gate voltage applied on the system, the electron can be transferred between two spatially separated dots. We numerically study the effect of the system parameters on transfer fidelity and find a perfect matching between them. We also find that there is a relatively large tolerance range of difference between two coupling constants to permit high-fidelity quantum state transfer.

DOI
10.1103/physreva.83.014301

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We describe a scheme for using an all-electrical, rapid, adiabatic population transfer between two spatially separated dots in a triple-quantum dot system. The electron spends no time in the middle dot and does not change its energy during the transfer process. Although a coherent population transfer method, this scheme may well prove useful in incoherent electronic computation (for example quantum-dot cellular automata) where it may provide a coherent advantage to an otherwise incoherent device. It can also be thought of as a limiting case of type II quantum computing, where sufficient coherence exists for a single gate operation, but not for the preservation of superpositions after the operation. We extend our analysis to the case of many intervening dots and address the issue of transporting quantum information through a multi-dot system.
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