论文标题
用于测量多光集体阶段的稀疏干涉法
Sparse interferometry for measuring multiphoton collective phase
论文作者
论文摘要
多光子集体相是一种多光子散射特征，无法将其简化为一系列两光子散射事件，而三光子“ Triad phas”是最小的非平凡示例。观察高阶集体阶段在实验上具有挑战性，并且仅观察到三合会和四元四元集体阶段。我们介绍了一种方案，以通过设计稀疏干涉仪来使高阶多光子集体相位观测值可行，这与观察多光子集体阶段的最佳最佳方案相比，该方案显着降低了复杂性。具体而言，我们的方案将光学深度从对数减少到恒定，并将光束拆分器的数量从$ O（n \ log n）$减少到相对于集体相位订单$ n $的线性缩放。随着恒定的深度将损失和分散降低到固定速度，无论集体阶段秩序如何，观察大规模集体阶段的主要障碍将被删除。
A multiphoton collective phase is a multiphoton-scattering feature that cannot be reduced to a sequence of two-photon scattering events, and the three-photon "triad phas" is the smallest nontrivial example. Observing a higher-order collective phase is experimentally challenging, and only triad and four-photon tetrad collective phases have been observed. We introduce a scheme to make higher-order multiphoton collective-phase observations feasible by designing a sparse interferometer, which significantly reduces complexity compared with the current best scheme for observing a multiphoton collective phase. Specifically, our scheme reduces the optical depth from logarithmic to constant and reduces the number of beam splitters from $O(n\log n)$ to linear scaling with respect to the collective-phase order $n$. As constant depth reduces loss and dispersion to a fixed rate regardless of collective-phase order, a major obstacle to observing large-scale collective phases is removed.
