1. Peierls distorted chain as a quantum data bus for quantum state transfer
- Author
-
Ying Li, Z. Song, Chang-Pu Sun, and M.X. Huo
- Subjects
Physics ,Quantum Physics ,Statistical Mechanics (cond-mat.stat-mech) ,Condensed Matter - Mesoscale and Nanoscale Physics ,Band gap ,FOS: Physical sciences ,General Physics and Astronomy ,Chain (algebraic topology) ,Quantum state ,Quantum mechanics ,Qubit ,Mesoscale and Nanoscale Physics (cond-mat.mes-hall) ,Quantum system ,Condensed Matter::Strongly Correlated Electrons ,Quantum Physics (quant-ph) ,Spin (physics) ,Quantum information science ,Quantum ,Condensed Matter - Statistical Mechanics - Abstract
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., 10 pages, 6 figures
- Published
- 2006