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Deterministic generation of a two-dimensional cluster state
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Measurement-based quantum computation offers exponential computational speed-up via simple measurements on a large entangled cluster state. We propose and demonstrate a scalable scheme for the generation of photonic cluster states suitable for universal measurement-based quantum computation. We exploit temporal multiplexing of squeezed light modes, delay loops, and beam-splitter transformations to deterministically generate a cylindrical cluster state with a two-dimensional (2D) topological structure as required for universal quantum information processing. The generated state consists of more than 30000 entangled modes arranged in a cylindrical lattice with 24 modes on the circumference, defining the input register, and a length of 1250 modes, defining the computation depth. Our demonstrated source of 2D cluster states can be combined with quantum error correction to enable fault-tolerant quantum computation.
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Bimodal non-Gaussian photonic states from a single quantum emitter in a waveguide
A waveguide-coupled two-level emitter driven by pulsed squeezed vacuum can produce two-mode non-Gaussian states from which high-fidelity squeezed cat states are obtained by temporal-mode selection and single-photon heralding.
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