量子传话游戏
A quantum game of telephone
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中文总结 AI 辅助
针对多节点量子网络表征的实验挑战，提出量子传话协议，该协议利用中间探测事件并结合全局推断解决通道模糊性，无需严格满秩要求，为表征复杂量子网络提供高效途径。
中文摘要 AI 辅助
表征缺乏普遍存在的局域纠缠源的多节点量子网络面临重大实验挑战。我们提出“量子传话”协议，这是一种迭代的辅助量子比特辅助过程层析技术，利用中间探测事件，将先前探测过的链路有效视为后续链路的辅助量子比特。在已部署的多节点光纤网络上实现该协议时，我们观测到噪声中间通道会产生基本参数简并，在顺序估计下会加剧推断误差。违反直觉的是，纳入下游近幺正通道可提供边界约束，当与全局推断结合使用时，能解决序列中更早通道的模糊性。通过补偿局域信息损失，该方法无需满足标准辅助量子比特辅助过程层析的严格满秩要求，即使中间态完全退极化也适用。总体而言，量子传话为在有限资源下表征复杂量子网络提供了硬件高效且信息最大化的途径。
英文摘要
Characterizing multinode quantum networks without ubiquitous local entanglement sources presents significant experimental challenges. We introduce ``quantum telephone,'' an iterative ancilla-assisted process tomography protocol that leverages intermediate detection events, effectively treating previously probed links as ancillae for subsequent links. Implemented on a deployed multinode fiber network, we observe noisy intermediate channels create fundamental parameter degeneracies that compound inference errors under sequential estimation. Counterintuitively, the inclusion of downstream near-unitary channels provides boundary constraints that, when used in tandem with global inference, can resolve ambiguity in channels earlier in the sequence. By compensating for localized information loss, this approach obviates the strict full-rank requirements of standard ancilla-assisted process tomography, even when intermediate states become completely depolarized. Overall, quantum telephone offers a hardware-efficient and information-maximizing path toward characterizing complex quantum networks with limited resources.
