Abstract
After a successful decade of purely fundamental research, the topological photonics community is starting to explore applications more seriously. Among the most promising fields of application for topological photonics are integrated laser sources and quantum circuits. In this talk I will review the latest results on topologically protected quantum states of light, with an emphasis on our recent experimental demonstration of topological protection of photonic path entanglement. Our experimental platform is a bipartite lattice of silicon nanowires which supports to uncoupled topological edge states. By using a common weak pump evenly split between the two edge modes, and leveraging four-wave mixing in the silicon nanowires, we were able to encode a biphoton N00N state of two topological edge modes. We demonstrate that this spatial entanglement is preserved even in the presence of deliberately induced disorder in the position of the waveguides.
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