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arXiv · 2604.07862

Fast and Coherent Transfer of Atomic Qubits in Optical Tweezers using Fiber Array Architecture

Jia-Chao Wang·Zai-Zheng Zhang·Xiao Li·Guang-Wei Wang·Xiao-Dong He·Min Liu·Peng Xu
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Abstract

Programmable neutral-atom arrays offer a promising route toward scalable quantum computing, where coherent qubit transfer enables non-local connectivity and reduces resource overhead. However, transfer speed and motional heating remain key bottlenecks for fast and deep quantum circuits. Here, we employ a fiber array neutral-atom quantum computing architecture with site-resolved control of trap depths to realize smooth amplitude exchange between static and moving traps, thereby enabling fast and coherent qubit transfer with ultralow motional heating. With a 10 $\mu$s in situ transfer between static and moving traps, we obtain a per-cycle heating rate of 0.156(9) $\mu$K, sustain over 500 cycles with negligible atom loss, and achieve a quantum state fidelity of 0.99992(5) per cycle. For inter-site transfer between two separated static traps, the operation takes 120 $\mu$s with 0.783(17) $\mu$K heating per transfer, and remains negligible atom loss for up to 100 repeated cycles with a fidelity of 0.9998(1) per transfer. Furthermore, through experimental studies of parallel transfer, we establish a model that elucidates the relationship between array inhomogeneity and the transfer heating rate. This fast, low-heating coherent transfer capability provides a practical route for improving both speed and fidelity in atom-shuttling based quantum computing.

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Jia-Chao Wang, Zai-Zheng Zhang, Xiao Li, Guang-Wei Wang, Xiao-Dong He, Min Liu, Peng Xu. 2026-04-09. Fast and Coherent Transfer of Atomic Qubits in Optical Tweezers using Fiber Array Architecture. https://arxiv.org/abs/2604.07862

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