We study coherent adiabatic quantum state transfer through a multipath data bus by means of controlling on-site energies, and analyze the effect of pathway number on transfer efficiency. We first introduce a simple spacial geometry and demonstrate that the multipath data bus which contributes to the quantum state transfer can reduce to a tight-binding chain with three quantum dots. Simulation results show that the electron can be transferred more efficiently by properly increasing the number of transfer paths under the same shape of controlling pulses. The optimal pathway number and the corresponding high-fidelity transfer time scale are determined by the numerical analysis. Finally, we extend our proposal to a more general system. The results show that such a scheme is relatively insensitive to imperfect fabrications. Our discussions illuminate the possibility of system engineering to enhance control and transfer times.

• Received 26 February 2013

DOI:https://doi.org/10.1103/PhysRevA.88.022323