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Bulletin of the American Physical Society

Topologically Protected Quantum State Transfer

Norman Y. Yao, Chris R. Laumann, Liang Jiang, Alexey Vyacheslavovich Gorshkov, Hendrik Weimer, J. I. Cirac, Mikhail D. Lukin

Published Jun 14, 2011• 0 citations
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Gap-protected topological channels are a promising way to realize robust and high-fidelity state transfer in quantum networks. Although various topological transfer protocols based on the Su-Schrieffer-Heeger (SSH) model or its variants have been proposed, the phase accumulation during the evolution, as an essential aspect, is underestimated. Here, by numerically studying the phase information of quantum state transfer (QST) in one-dimensional (1D) topological spin chains, we uncover a universal phase correction ϕ0=(N−1)π/2 for both adiabatic and diabatic topological schemes. Interestingly, the site-number-dependent phase correction satisfies Z4 symmetry and is equally effective for perfect mirror transmission in spin chains. Our work reveals a universal phase correction in 1D topologically protected QST, which will prompt a reevaluation of the topological protection mechanism in quantum systems.