Ehrhardt Max, Keil Robert, Maczewsky Lukas J, Dittel Christoph, Heinrich Matthias, Szameit Alexander
Institut für Physik, Universität Rostock, Albert-Einstein-Straße 23 18059 Rostock, Germany.
Institut für Experimentalphysik, Universität Innsbruck, Technikerstr. 25, 6020 Innsbruck, Austria.
Sci Adv. 2021 Feb 26;7(9). doi: 10.1126/sciadv.abc5266. Print 2021 Feb.
Graph representations are a powerful concept for solving complex problems across natural science, as patterns of connectivity can give rise to a multitude of emergent phenomena. Graph-based approaches have proven particularly fruitful in quantum communication and quantum search algorithms in highly branched quantum networks. Here, we introduce a previously unidentified paradigm for the direct experimental realization of excitation dynamics associated with three-dimensional networks by exploiting the hybrid action of spatial and polarization degrees of freedom of photon pairs in complex waveguide circuits with tailored birefringence. This testbed for the experimental exploration of multiparticle quantum walks on complex, highly connected graphs paves the way toward exploiting the applicative potential of fermionic dynamics in integrated quantum photonics.
图形表示法是解决自然科学中复杂问题的一个强大概念，因为连接模式可以产生大量的涌现现象。基于图形的方法在高度分支的量子网络中的量子通信和量子搜索算法中已被证明特别富有成效。在这里，我们通过利用具有定制双折射的复杂波导电路中光子对的空间和偏振自由度的混合作用，引入了一种以前未被识别的范式，用于直接实验实现与三维网络相关的激发动力学。这个用于在复杂的、高度连接的图形上进行多粒子量子行走实验探索的试验台，为利用集成量子光子学中费米子动力学的应用潜力铺平了道路。
