ArticlePhysics & AstronomyA novel integrated quantum circuit for high-order W-state generation and its highly precise characterization

Multipartite entangled states like the W-class are of growing interest since they exhibit a variety of possible applications ranging from quantum computation to genuine random number generation. Here, we present a universal setup to generate high-order single photon W-states based on three-dimensional integrated-photonic waveguide structures. Additionally, we present a novel method to characterize the device's unitary by means of classical light only.