Integrated Photonic Platform Based On Thin-Film Lithium Niobate

Scalable photonic quantum computing architectures require photonic processing devices. Such platforms rely on low-loss, high-speed, reconfigurable circuits and near-deterministic resource state generators. In a new report, a research team has developed an integrated photonic platform with thin-film lithium niobate. The scientists integrated the platform with deterministic solid-state single photon sources using quantum dots in nanophotonic waveguides.

Researchers processed the generated photons within low-loss circuits at speeds of several gigahertz. They experimentally realized a variety of key photonic quantum information processing functionalities on high-speed circuits, with inherent key features to develop a four-mode universal photonic circuit. The results illustrate a promising direction in developing scalable quantum technologies by merging integrated photonics with solid-state deterministic photon sources.

The new integrated photonic platform unlocks scalable quantum hardware for long-range quantum networks with interconnections across multiple quantum devices and photonic circuits for quantum computing and simulation experiments. The high-quality photonic states and the fast, low-loss programmable circuits underlie the central idea of photonic quantum technologies to route and process applications. Researchers have recently developed solid-state quantum emitters such as quantum dots as near-ideal, high-efficiency sources of indistinguishable photons to realize on-demand single-photon sources.

In this work, the team described the development of multimode lithium niobate on insulator circuits for quantum information processing at the single photon level for the first time. They accomplished this by using the circuits to regulate and facilitate the function of quantum states of light emitted from a quantum dot single-photon source.

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