Reduce, reuse, recycle, for robust cluster state generation
Abstract
Efficient generation of cluster states is crucial for engineering large-scale measurement-based quantum computers. Hybrid matter-optical systems offer a robust, scalable path to this goal. Such systems have an ancilla which acts as a bus connecting the qubits. We show that by generating smaller cluster "Lego bricks", reusing one ancilla per brick, the cluster can be produced with maximal efficiency, requiring fewer than half the operations compared with no bus reuse. By reducing the time required to prepare sections of the cluster, bus reuse more than doubles the size of the computational workspace that can be used before decoherence effects dominate. A row of buses in parallel provides fully scalable cluster state generation requiring only 20 CPhase gates per bus use.
Cite
@article{arxiv.1005.1621,
title = {Reduce, reuse, recycle, for robust cluster state generation},
author = {Dominic Horsman and Katherine L. Brown and William J. Munro and Vivien M. Kendon},
journal= {arXiv preprint arXiv:1005.1621},
year = {2023}
}
Comments
4 pages, 3 figures; v2 significant update, results improved, typos and references fixed; v3 minor update in response to referee comments, figure added; v4 now 5.5 pages 3 figures, added section headings and more references; v5 minor corrections, updated references, close to publishers version; v6 correct formatting error and add journal reference