发表机构
Sparrow Quantum; University of Copenhagen; University of Bristol; The Niels Bohr Institute, University of Copenhagen（Sparrow量子; 哥本哈根大学; 布里斯托大学; 哥本哈根大学尼尔斯·玻尔研究所）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
针对量子发射器生成光子图态的噪声问题，开发了仅需线性光学与光子探测器、成功概率最高1/2的纯化方案，可用于光子图态及稳定器态，还优化了适配特定噪声的级联方案。
AI 中文摘要
图态是光子量子计算的主要构建块，带有内嵌自旋的量子发射器可确定性地产生光子图态，大幅降低了高度概率性线性光学图态生成的复用开销。然而，这类图态通常受多种噪声源影响，导致生成态的保真度降低。为缓解该问题，我们开发了纠缠光子态的纯化方案：首先开发纯化任意光子GHZ态及其他CSS态的方案，将其推广至所有光子图态和稳定器态；所提纯化方案成功概率高达1/2，仅需线性光学和光子探测器；我们考虑唯象泡利错误或量子发射器产生的时间-bin编码图态的物理噪声，针对多种图态优化了级联纯化方案。
英文摘要
Graph states constitute the main building block for quantum computing with photons. Quantum emitters with a hosted spin can deterministically generate photonic graph states, strongly lowering the overhead of multiplexing highly probabilistic linear-optics graph state generation. However, they generally suffer from various noise sources, resulting in reduced fidelities of the produced states. To mitigate this issue, we develop purification schemes for entangled photonic states. We first develop purification schemes to purify arbitrary photonic GHZ and other CSS states, which we generalize to all photonic graph states and stabilizer states. The proposed purification schemes have a high success probability of up to $1/2$ and require only linear optics and photon detectors. We optimize cascaded purification schemes for various graph states, taking into account phenomenological Pauli errors or physical noise in time-bin-encoded graph state generation with quantum emitters.
