We compare different circuits implementing distributed versions of quantum computations, using entangled pairs only, and using distributed fan-out operations (using GHZ states). We highlight the advantages of using distributed fan-out operations in terms of reductions in circuit depth and (possibly) entanglement resources. We note that distributed fan-out operations (or notably, distributed GHZ states) could be a ``primitive'' building block for distributed quantum operations in the same way as entangled pairs are, if distributed GHZ states could be realized efficiently.

翻译：本文比较了实现分布式量子计算的不同电路方案，包括仅使用纠缠对的方案以及采用分布式扇出操作（利用GHZ态）的方案。我们重点分析了分布式扇出操作在降低电路深度和（可能）减少纠缠资源方面的优势。值得注意的是，若能高效实现分布式GHZ态，则分布式扇出操作（特别是分布式GHZ态）有望成为分布式量子运算的"基础"构建模块，其地位类似于纠缠对在当前量子计算架构中的作用。