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Peierls distorted chain as a quantum data bus for quantum state transfer

M. X. Huo·Ying Li·Z. Song·C. P. Sun
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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.

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M. X. Huo, Ying Li, Z. Song, C. P. Sun. 2006-06-01. Peierls distorted chain as a quantum data bus for quantum state transfer. https://doi.org/10.1209/0295-5075%2F84%2F30004

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