Topologically protected valley-dependent quantum photonic circuits

Abstract

Topological photonics has been introduced as a powerful platform for integrated optics, since it can deal with robust light transport, and be further extended to the quantum world. Strikingly, valley-contrasting physics in topological photonic structures contributes to valley-related edge states, their unidirectional coupling, and even valley-dependent wave-division in topological junctions. Here, we design and fabricate nanophotonic topological harpoon-shaped beam splitters (HSBSs) based on $120$-deg-bending interfaces and demonstrate the first on-chip valley-dependent quantum information process. Two-photon quantum interference, namely, HongOu-Mandel (HOM) interference with a high visibility of $0.956\pm 0.006$, is realized with our 50/50 HSBS, which is constructed by two topologically distinct domain walls. Cascading this kind of HSBS together, we also demonstrate a simple quantum photonic circuit and generation of a path-entangled state. Our work shows that the photonic valley state can be used in quantum information processing, and it is possible to realize more complex quantum circuits with valley-dependent photonic topological insulators, which provides a novel method for on-chip quantum information processing.

arXiv comment6 pages, 4 figures

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• Nonlinear photonic disclination states
• Topological transitions and Anderson localization of light in disordered atomic arrays
• Observing 0D subwavelength-localized modes at ~100 THz protected by weak topology
• Valley and Valley-like Split-ring Topological Photonic Crystal
• Chiral adiabatic transmission protected by Fermi surface topology
• Exact dynamics and bound states of a cavity coupled to a two-dimensional reservoir
• Synchronized in-gap edge states and robust copropagation in topological insulators without magnetic flux