利用更少辅助单光子且成功概率更高的线性光分束扇出门
Linear optical fan-out gates using fewer ancillary single photons with enhanced success probability
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中文总结 AI 辅助
该研究提出一种线性光学方案，以更少辅助单光子和偏振分束器实现高成功概率的多量子比特扇出门，降低资源开销且鲁棒性优于门分解方法。
中文摘要 AI 辅助
光子量子门是各类光量子信息处理任务的基本构建模块。我们提出一种高效的线性光学方案，用于实现后选三量子比特扇出门（也称为受控非-非门），仅需两个辅助单光子和线性光学元件。该方案可推广至n量子比特扇出门，需(n-1)个辅助单光子和(3n-3)个偏振分束器（PBS），成功概率为(1/4)^(n-1)。与标准门分解方法相比，后者需(2n-2)个辅助单光子、(5n-5)个PBS，成功概率为(1/8)^(n-1)。我们的方案大幅降低了资源开销并提高了成功概率，进一步评估了该门的性能，证明其相比基于门分解的方法具有更强的鲁棒性。
英文摘要
Photonic quantum gates are fundamental building blocks for a wide range of optical quantum information processing tasks. We propose an efficient linear-optical scheme for implementing a post-selected three-qubit fan-out gate (also known as a controlled-NOT-NOT gate) using only two ancillary single photons and linear optical elements. The scheme can be generalized to an $n$-qubit fan-out gate, requiring $(n-1)$ ancillary single photons and $(3n-3)$ polarizing beam splitters (PBSs), with a success probability of $\left(\frac{1}{4}\right)^{n-1}$. Compared to the standard gate decomposition approach, which requires $(2n-2)$ ancillary single photons, $(5n-5)$ PBSs, and yields a success probability of $\left(\frac{1}{8}\right)^{n-1}$. Our scheme significantly reduces the resource overhead and improves the success probability. We further evaluate the gate performance and demonstrate improved robustness compared to gate decomposition-based methods.
