Robust Multiple-Range Coherent Quantum State Transfer.

Bing Chen,Yong Li,Xiao-Feng Qian,Yan-Dong Peng

doi:10.1038/srep28886

Abstract

We propose a multiple-range quantum communication channel to realize coherent two-way quantum state transport with high fidelity. In our scheme, an information carrier (a qubit) and its remote partner are both adiabatically coupled to the same data bus, i.e., an N-site tight-binding chain that has a single defect at the center. At the weak interaction regime, our system is effectively equivalent to a three level system of which a coherent superposition of the two carrier states constitutes a dark state. The adiabatic coupling allows a well controllable information exchange timing via the dark state between the two carriers. Numerical results show that our scheme is robust and efficient under practically inevitable perturbative defects of the data bus as well as environmental dephasing noise.

Highlights

We propose a multiple-range quantum communication channel to realize coherent two-way quantum state transport with high fidelity
Where −J (
In this paper we study the electron transfer from QD-A to QD-B through the tight-binding array serving as quantum data bus, and we denote the transfer distance d = 2l + 3

Summary

Introduction

We propose a multiple-range quantum communication channel to realize coherent two-way quantum state transport with high fidelity. The investigation of accomplishing high fidelity quantum state transfer in electronic and spin systems has recently drawn tremendous attention (see for example refs 4–17 and an overview3) Many of these schemes are based on the natural dynamical evolution of permanent coupled chain of quantum systems, and require no control during the QST. Such schemes rely on precise manufacture of the system interaction parameters as well as accurate timing of information processing, and may not be robust against experimental imperfection settings, such as small variations of the system Hamiltonian, environmental noise, etc. Stimulated Raman adiabatic passage (STIRAP) is such an example in a three-level atomic system In this technique, the dark state which is a coherent superposition of message and target states plays a central role in the process of information transfer. Numerical results are performed to illustrate that our scheme is robust against dephasing and small variations of the QD couplings and imperfections

Methods

Results

Conclusion