Boson Sampling is a computational paradigm representing one of the most viable and pursued approaches to demonstrate the regime of quantum advantage. Recent results have shown significant technological leaps in single-photon generation and detection, leading to progressively larger instances of Boson Sampling experiments in different photonic systems. However, a crucial requirement for a fully-fledged platform solving this problem is the capability of implementing large-scale interferometers, that must simultaneously exhibit low losses, high degree of reconfigurability and the realization of arbitrary transformations. In this work, we move a step forward in this direction by demonstrating the adoption of a compact and reconfigurable 3D-integrated platform for photonic Boson Sampling. We perform 3- and 4-photon experiments by using such platform, showing the possibility of programming the circuit to implement a large number of unitary transformations. These results show that such compact and highly-reconfigurable layout can be scaled up to experiments with larger number of photons and modes, and can provide a viable direction for hybrid computing with photonic processors.

玻色子采样是一种计算范式，代表了展示量子优势机制的最可行和最受追捧的方法之一。最近的结果表明，在单光子生成和检测方面取得了重大的技术飞跃，导致在不同光子系统中进行越来越大的玻色子采样实验实例。然而，解决这个问题的成熟平台的一个关键要求是实现大规模干涉仪的能力，它必须同时表现出低损耗、高度可重构性和任意变换的实现。在这项工作中，我们通过展示采用紧凑且可重构的 3D 集成平台进行光子玻色子采样，朝着这个方向迈出了一步。我们使用这样的平台进行 3 和 4 光子实验，显示了对电路进行编程以实现大量单一变换的可能性。这些结果表明，这种紧凑且高度可重构的布局可以扩展到具有更多光子和模式的实验，并且可以为光子处理器的混合计算提供一个可行的方向。