Long-range adiabatic quantum state transfer through a linear array of quantum dots

• Published in: Science China. Physics, mechanics & astronomy Vol. 55; no. 9; pp. 1635 - 1640
• Main Authors: Chen, Bing, Shen, QingHui, Fan, Wei, Xu, Yan
• Format: Journal Article
• Language: English
• Published: Heidelberg SP Science China Press 01.09.2012; Springer Nature B.V
• Subjects: Adiabatic flow; Astronomy; Classical and Continuum Physics; Energy gap; Fabrication; Linear arrays; Observations and Techniques; Physics; Physics and Astronomy; Quantum dots; Quantum phenomena; Schrodinger equation; 传输; 数值求解; 线性阵列; 绝热通道; 薛定谔方程; 远距离; 量子态; 量子点阵列; tight-binding model; quantum state transfer; adiabatic passage
• ISSN: 1674-7348; 1869-1927
• DOI: 10.1007/s11433-012-4841-3

We introduce an adiabatic long-range quantum communication proposal based on a quantum dot array. By adiabatically vary- ing the external gate voltage applied on the system, the quantum information encoded in the electron can be transported from one end dot to another. We numerically solve the schr~dinger equation for a system with a given number of quantum dots. It is shown that this scheme is a simple and efficient protocol to coherently manipulate the population transfer under suitable gate pulses. The dependence of the energy gap and the transfer time on system parameters is analyzed and shown numerically. We also investigate the adiabatic passage in a more realistic system in the presence of inevitable fabrication imperfections. This method provides guidance for future realizations of adiabatic quantum state transfer in experiments.