Fast and robust magnon transport in a spin chain

Abstract

A protocol for fast and robust magnon transport in a one-dimensional spin chain is devised. Employing an approximate mapping between the chain and a single harmonically trapped particle, we exploit the known analytic control protocols for the latter and adopt them to achieve fast, high-fidelity transport in the chain. We compare the performance with finite time adiabatic protocols, establishing that the designed scheme allows for significantly faster and more stable transport. Furthermore, we show that a sharp transition exists between regions in which the protocol is effective and when it breaks down, giving rise to a heuristic speed limit for the process.

arXiv comment7 pages, 4 figures. Close to published version

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• Dynamical uncertainty propagation with noisy quantum parameters
• Minimal action control method in quantum critical models
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• Ergotopy transport in a one dimensional spin chain
• Improved anharmonic trap expansion through enhanced shortcuts to adiabaticity
• Robust implicit quantum control of interacting spin chains
• Nonlinear speed-ups in ultracold quantum gases