We systematically study the transfer of quantum state of electron spin as the flying qubit along a half-filled Peierls distorted tight-binding chain described by the Su-Schrieffer-Heeger (SSH) model, which behaves as a quantum data bus. This enables a novel physical mechanism for quantum communication with always-on interaction: the effective hopping of the spin carrier between sites A and B connected to two sites in this SSH chain can be induced by the quasi-excitations of the SSH model. As we prove, it is the Peierls energy gap of the SSH quasi-excitations that plays a crucial role to protect the robustness of the quantum state transfer process. Moreover, our observation also indicates that such a scheme can also be employed to explore the intrinsic property of the quantum system.
Cite
@article{arxiv.cond-mat/0606021,
title = {Peierls distorted chain as a quantum data bus for quantum state transfer},
author = {M. X. Huo and Ying Li and Z. Song and C. P. Sun},
journal= {arXiv preprint arXiv:cond-mat/0606021},
year = {2009}
}